BU21170MUV-E2 - ROHM SEMICONDUCTOR

○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays

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Capacitive Controller ICs

Capacitive Switch Controller IC

BU21170MUV

General Description

BU21170MUV is a capacitive sensor controller for switch

operation.

BU21170MUV has five sensors and provides the simple

switch function by each sensor.

If external noise and temperature drift are detected, the

automatic self-calibration is operated.

Include LED controller with PWM function.

Features

 5 capacitive sensor ports.

 Automatic self-calibration.

 Continued touch detection.

 LED controller with PWM function.

 Inform the detected result of switch operation by

interrupt.

 2-wire serial bus interface.

 Single power supply.

 Built-in Power-On-Reset and Oscillator.

Applications

 Information appliance as printer.

 AV appliance as digital TV and HDD recorder.

 Notebook PC.

Key Specifications

 Power Supply Voltage Range: 3.0V to 5.5V

 Operating Temperature Range: -25°C to +85°C

 Operating Current: 3.5mA(Typ without load)

 Scan Rate: 14.8msec(Typ)

Package W(Typ) x D(Typ) x H(Max)

VQFN020V4040 4.00mm x 4.00mm x 1.00mm

Typical Application Circuit

0.1uF

VDD

AVDD

2.2uF

VSS

TEST

HOST

SCL

SDA

INT

VDD

4.7kΩ

VDD

LEDR

LED3

VDD

LEDR

VDD

LEDR

LED2

ADR

Recommended DT number : DTC043ZEB

LED4

SIN2

SIN1

SIN0

BU21170MUV

TOP VIEW

15

15 11

20

16

6

10

VDD

LEDR

SIN4

DT

DVDD

1.0uF

SIN3

VDD

LEDR

DT

LED1

LED0

VDD

N.C.

VQFN020V4040

Figure 1. Typical Application Circuit

Datashee

t

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Pin Configuration

LED4

N.C.

SIN4

SIN2

SIN3

SIN1

SIN0

AVDD

VDD

DVDD

INT

SDA

SCL

VSS

TEST

LED2

LED3

LED0

LED1

ADR

20

16

17

19

18

6

10

9

7

8

15 111214 13

1 542 3

BU21170MUV

TOP VIEW

Pin Descriptions

No.

Name

Type

Function

Note

Power

Initial

Condition

I/O

Equivalent

Circuit

1

SIN1

Ain

Capacitive touch sensor 1

AVDD

Hi-Z

Figure 3

2

SIN0

Ain

Capacitive touch sensor 0

AVDD

Hi-Z

Figure 3

3

AVDD

Power

LDO output for analog blocks

-

4

VDD

Power

-

5

DVDD

Power

LDO output for digital blocks

-

6

VSS

Ground

-

7

TEST

In

Test input

Fixed ‘L’ at the normal operation

VDD

-

Figure 4

8

SCL

InOut

Host I/F：SCL

VDD

Hi-Z

Figure 4

9

SDA

InOut

Host I/F：SDA

VDD

Hi-Z

Figure 4

10

INT

Out

Interrupt output

Active High interrupt

VDD

‘L’

Figure 5

11

ADR

In

Select slave address input

‘H’:0x4D , ‘L’:0x4C

VDD

-

Figure 4

12

LED0

Out

LED control with PWM output 0

Active High

VDD

Hi-Z

Figure 5

13

LED1

Out

LED control with PWM output 1

Active High

VDD

Hi-Z

Figure 5

14

LED2

Out

LED control with PWM output 2

Active High

VDD

Hi-Z

Figure 5

15

LED3

Out

LED control with PWM output 3

Active High

VDD

Hi-Z

Figure 5

16

LED4

Out

LED control with PWM output 4

Active High

VDD

Hi-Z

Figure 5

17

N.C.

-

18

SIN4

Ain

Capacitive touch sensor 4

AVDD

Hi-Z

Figure 3

19

SIN3

Ain

Capacitive touch sensor 3

AVDD

Hi-Z

Figure 3

20

SIN2

Ain

Capacitive touch sensor 2

AVDD

Hi-Z

Figure 3

I/O Equivalent Circuits

AIN

ASW

PAD

I

OEN

AVDD

PAD

CIN

I

VDD

OEN

PAD

I

VDD

Figure 2. Pin Configuration

Figure 3. I/O Equivalent Circuit (a)

Figure 4. I/O Equivalent Circuit (b)

Figure 5. I/O Equivalent Circuit (c)

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Block Diagram

LDO15

LDO28

VREF

OSC

Sensor

AFE

C/V

Converter

A/D

AVDD

DVDD

SIN0-4

LED0-4

LOGIC

AFE

MPU

WRAM

PROM

LEDDRV

VDD

VSS

SDA

SCL

TEST

AFE_CNT

PWM_CNT

INT

DTG

WDTR

POR

HOST

I/F

ADR

Block Descriptions

Sensor AFE , C/V Converter

Convert from capacitance to voltage following the order of sensors.

A/D

Convert from voltage to the detected result the digital value.

LDO28

2.73V output LDO for Sensor AFE, C/V Converter and A/D.

LDO15

1.5V output LDO for OSC and digital blocks.

OSC

Ring oscillator as the system clock.

POR

Power-On-Reset monitoring VDD as the system reset.

MPU

Based on the detection result, detect switch operations (Touch/Release/Hold) and run Auto-calibration.

Inform by the INT port to the host about that the switch operations are detected.

LED ports are controlled by the commands from the host.

HOST I/F

2-wire serial bus interface compatible with I2C protocol. Slave address is selectable by pin ADR.

AFE_CNT

Sequencer of Sensor AFE, C/V converter and A/D.

PWM_CNT

PWM timers for the LED ports.

LEDDRV

LED port drivers.

WDTR

Watchdog timer Timeout Reset. It releases the system reset after 0.6sec from that MPU cannot clear WDTR.

(If MPU cannot clear WDTR, MPU is hung up.)

PROM

Program ROM for the included MPU.

WRAM

Work RAM for the included MPU.

Figure 6. Block Diagram

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Absolute Maximum Ratings (Ta=25°C)

Parameter

Symbol

Rating

Unit

Power Supply Voltage

VDD

-0.5 to 7.0

V

Input Voltage

VIN

-0.3 to VDD +0.7

V

Power Dissipation(Note 1)

Pd

0.55

W

Operating Temperature Range

Topr

-25 to +85

°C

Storage Temperature Range

Tstg

-55 to +125

°C

Maximum Junction Temperature

Tjmax

125

°C

(Note 1) Mounted on 74.2mm x 74.2mm x 1.6mm glass epoxy 1layer board (Copper foil area : 10.29mm2). Reduce 5.5mW per 1°C above 25°C

Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit

between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over

the absolute maximum ratings.

Recommended Operating Conditions

Parameter

Symbol

Min

Typ

Max

Unit

Power Supply Voltage

VDD

3.0

3.3

5.5

V

Electrical Characteristics

(VDD=3.3V , VSS=0V , Ta=25°C, unless otherwise specified.)

Parameter

Symbol

Min

Typ

Max

Unit

Condition

Input High voltage

VIH

VDD x 0.7

-

VDD + 0.3

V

Input Low voltage

VIL

VSS - 0.3

-

VDD x 0.3

V

Output High voltage

VOH

VDD - 0.5

-

VDD

V

IOH = -4mA

Output Low voltage

VOL

VSS

-

VSS + 0.5

V

IOL = 4mA

Oscillator clock frequency

fOSC

45

50

55

MHz

DVDD LDO output voltage

VDVDD

1.35

1.50

1.65

V

AVDD LDO output voltage

VAVDD

2.63

2.73

2.83

V

Power-on-reset release voltage

2.25

-

2.55

V

Power-on-reset detect voltage

2.10

-

2.40

V

Operating Current

IDD

-

3.5

-

mA

Without load of sensors.

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Register Map

(OSC = 50MHz , unless otherwise noted)

No accessing to the reserved areas is allowed.

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【0x00-0x04 : Sensor Data】

Name: SIN_DATA

Address: 0x00-0x04

Description: This registers shows 8bit ADC value of each sensor.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x00

SD_SIN0[7:0]

0x01

SD_SIN1[7:0]

0x02

SD_SIN2[7:0]

0x03

SD_SIN3[7:0]

0x04

SD_SIN4[7:0]

R/W

R

Initial val.

0

【0x0E : State of the peripheral PWM timer】

Name: STATE_PWM

Address: 0x0E

Description: 1 : The PWM timer is running. PWM state is on ‘RISE’, ‘FALL’, ‘ON’ or ‘OFF’.

0 : The PWM timer is not running.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x0E

-

PWM3

PWM2

PWM1

PWM0

R/W

-

R

Initial val.

0

【0x0F : State of the PWM sequence】

Name: CONT_PWM

Address: 0x0F

Description: 1 : PWM timer is running and not received stop command.

0 : PWM timer is running and received stop command. Or PWM timer is stopped.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x0F

-

PWM3

PWM2

PWM1

PWM0

R/W

-

R

Initial val.

0

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【0x10 : Interrupt factor】

Name: INTERRUPT

Address: 0x10

Description: This register shows the interrupt factors. Port INT outputs this register’s OR operation.

INI : Initialization finish :

This register is set to ‘1’ when initialization is complete after power-on-sequence or watch dog timer

reset. This register is cleared by setting ‘0’ to the bit INI that is included the ‘Clear interrupt’ registers

(Address 0xF0).

CAL : Software-calibration finish :

This register is set to ‘1’ when software calibration is complete. This register is cleared by setting ‘0’ to

the bit CAL that is included the ‘Clear interrupt’ registers (Address 0xF0).

ERCAL : Self-re-calibration finish :

This register is set to ‘1’ when self-re-calibration is complete. Self-re-calibration runs automatically

after the detection that IC should be re-calibration. This register is cleared by setting ‘0’ to the bit

ERCAL that is included the ‘Clear interrupt’ registers (Address 0xF0).

PWM : PWM continuous flashing of LED finish :

This register is set to ‘1’ when LED’s PWM drive has finished. This register is cleared by clearing

every bit of the ‘Interrupt of PWM continuous flashing’ register.

PERCAL : Periodic calibration finish :

This register is set to ‘1’ when periodic calibration is complete. This register is cleared by setting ‘0’ to

the bit PERCAL that is included the ‘Clear interrupt’ registers (Address 0xF0).

ONDET : Detection of switch-on :

This register is set to ‘1’ when it detects a switch operation is considered to be On. This register is

cleared by clearing every bit of the ‘Detection Switch-On’ register.

OFFDET : Detection of switch-off :

This register is set to ‘1’ when it detects a switch operation is considered to be Off. This register is

cleared by clearing every bit of the ‘Detection Switch-Off’ register.

CONTDET : Detection of continued touch :

This register is set to ‘1’ when it detects a continued touch switch operation. This register is cleared by

clearing every bit of the ‘Detection continuous touch’ register.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x10

CONTDET

OFFDET

ONDET

PERCAL

PWM

ERCAL

CAL

INI

R/W

R

Initial val.

0

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【0x11 : Detection Switch-On】

Name: DETECT_ON

Address: 0x11

Description: This register indicates the change to ON from OFF of each switch.

If the mask for the ON operation included in the sensor settings is enabled, this register is disabled.

Logical OR of this register is ONDET included ‘Interrupt factor’ register.

1 : Detect On. 0 :Not detect On.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x11

-

ON_SW4

ON_SW3

ON_SW2

ON_SW1

ON_SW0

R/W

-

R

Initial val.

0

【0x12 : Detection Switch-Off】

Name: DETECT_OFF

Address: 0x12

Description: This register indicates the change to OFF from ON of each switch.

If the mask for the OFF operation included in the sensor settings is enabled, this register is disabled.

Logical OR of this register is OFFDET included ‘Interrupt factor’ register.

1 : Detect Off. 0 :Not detect Off.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x12

-

OFF_SW4

OFF_SW3

OFF_SW2

OFF_SW1

OFF_SW0

R/W

-

R

Initial val.

0

【0x13 : Detection continuous touch】

Name: DETECT_CONT

Address: 0x13

Description: This register indicates the detection of continuous touch of each switch.

If the mask for the continuous touch operation included in the sensor settings is enabled, this register is

disabled.

Logical OR of this register is CONTDET included ‘Interrupt factor’ register.

1 : Detect Continuous touch. 0 :Not detect Continuous touch.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x13

-

CONT_SW4

CONT_SW3

CONT_SW2

CONT_SW1

CONT_SW0

R/W

-

R

Initial val.

0

【0x14 : Interrupt of PWM continuous flashing】

Name: DETECT_PWM_FINISH

Address: 0x14

Description: This register indicates the end of the each LED PWM drive. And in the case that the PWM function is

stopped by the writing 0 to the PWM operation register (0xFC), this register is set to 1.

Logical OR of this register is PWM included ‘Interrupt factor’ register.

1 : Finished LED PWM drive. 0 :Clear.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x14

-

PWM3

PWM2

PWM1

PWM0

R/W

-

R

Initial val.

0

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【0x1B : State of interrupt from the peripherals】

Name: STATE_INT

Address: 0x1B

Description: This register shows the peripheral which issues an interrupt to MPU.

1 : Interrupt is. 0 : Interrupt is not.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x1B

PWM3

PWM2

PWM1

PWM0

WDT

-

AFE

I2C

R/W

R

-

R

Initial val.

0

【0x1C : State of IC】

Name: STATE

Address: 0x1C

Description: This register indicates the state of IC.

Indicates whether the IC is in calibration or not.

1 : In calibration. 0 : Not in calibration

The required time for calibration.：About 140 msec.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x1C

-

CALIB

R/W

-

R

Initial val.

0

【0x1D : Sensor State】

Name: STATE_SIN

Address: 0x1D

Description: This register indicates the state of each sensor

1 : Switch-on. (Register ‘SIN_DATA’ > Register ‘TH_ON’)

0 : Switch-off. (Register ‘SIN_DATA’ < Register ‘TH_OFF’)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x1D

-

SIN4

SIN3

SIN2

SIN1

SIN0

R/W

-

R

Initial val.

0

【0x1E : Read register for operation check of IC】

Name: RACT

Address: 0x1E

Description: This register is a read register for operational check of the IC. The value written to the write register for

operation check (Address is 0xFE) is copied to this register. If the write value and the read value are equal,

MPU and I/F are operating normally.

The required time to copy to this register from the write register for operation check : About 20usec.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x1E

RACT[7:0]

R/W

R

Initial val.

0

【0x85 , 0x8A : Software Reset】

Name: SOFTRESET

Address: 0x85, 0x8A

Description: These registers are used for hardware reset. If the 0x85 register’s value is 0x55 and the 0x8A is 0xAA,

then a hardware reset will be done.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x85

SRST[7:0]

0x8A

SRST[15:8]

R/W

Initial val.

0

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【0xC0-0xCE : Sensor Settings】

Name: SIN_CFG

Address: 0xC0 – 0xCE

Description: These registers are for setting of each SIN sensor.

The settings are the thresholds (from On to Off, and from Off to On), the gain and the mask function of the

each switch operation (On / Off / Continuous touch).

GAIN_SIN*[3:0] : Setting for the gain :

This register is for setting the gain of AFE. The smaller the value of this register is, the higher the gain is.

Adjustment range : 0x1 ≤ GAIN_SIN ≤ 0xF

The sensor which setting value is 0 has no switch function.

ON_TH_SIN*[7:0] : The threshold from Off to On :

This register is the threshold from Off to On. This value is compared to the register SIN_DATA. If the value

of this register is larger than SIN_DATA, the On operation is detected.

OFF_TH_SIN*[7:0] : The threshold from On to Off :

This register is the threshold from On to Off. This value is compared to the register SIN_DATA. If the value

of this register is smaller than SIN_DATA, the Off operation is detected.

Adjustment range : 0x00 < OFF_SIN* < ON_SIN* < 0xFF

The sensor which setting value is out of this range is unusable for switch operation.

MSK_ON_SIN*, MSK_OFF_SIN*, MSK_CONT_SIN* : Mask for the switch operation :

This register is the mask function of the each switch operation (On / Off / Continuous touch).

If the mask function is enabled, the register for detection of switch operation is disabled.

1 : Mask function is enable. 0 : Mask function is disable (default).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xC0

-

MSK_CONT_SIN0

MSK_OFF_SIN0

MSK_ON_SIN0

GAIN_SIN0[3:0]

0xC1

ON_TH_SIN0[7:0]

0xC2

OFF_TH_SIN0[7:0]

0xC3

-

MSK_CONT_SIN1

MSK_OFF_SIN1

MSK_ON_SIN1

GAIN_SIN1[3:0]

0xC4

ON_TH_SIN1[7:0]

0xC5

OFF_TH_SIN1[7:0]

0xC6

-

MSK_CONT_SIN2

MSK_OFF_SIN2

MSK_ON_SIN2

GAIN_SIN2[3:0]

0xC7

ON_TH_SIN2[7:0]

0xC8

OFF_TH_SIN2[7:0]

0xC9

-

MSK_CONT_SIN3

MSK_OFF_SIN3

MSK_ON_SIN3

GAIN_SIN3[3:0]

0xCA

ON_TH_SIN3[7:0]

0xCB

OFF_TH_SIN3[7:0]

0xCC

-

MSK_CONT_SIN4

MSK_OFF_SIN4

MSK_ON_SIN4

GAIN_SIN4[3:0]

0xCD

ON_TH_SIN4[7:0]

0xCE

OFF_TH_SIN4[7:0]

R/W

Initial val.

0

【0xCF :Monitor activity of the sensor】

Name: MONI_ACT

Address: 0xCF

Description: This register is used to select whether to monitor the register ACT (scan enable bit at the address 0xFF).

The monitor’s purpose is to prevent erroneous stop of detection of the AFE.

If the state that the AFE scan is stopped in the case that the monitor function is enabled is detected, the

AFE scan will be self-restarted.

Monitor function is executed about 300 msec.

1 : Monitor function is enabled. 0 : Monitor function is disabled (default).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xCF

-

MONI_ACT

R/W

-

R/W

Initial val.

0

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【0xD0 : Configuration continuous touch】

Name: CONTTIMES

Address: 0xD0

Description: CONTSEL：This register is to select the interrupt frequency by detection continuous touch.

1 : Every continuous touch period.

0 : First detect only.

CONT[5:0]：Continuous touch period is about 0.1[sec] x CONT.

If the setting value is 0x0, continuous touch function is disable.

(0.1sec ≤ Continuous touch period ≤ 6.3sec)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xD0

CONTSEL

-

CONT[5:0]

R/W

-

R/W

Initial val.

0

【0xD1 : Configuration oversampling】

Name: OSTIMES

Address: 0xD1

Description: OST[3:0]：This register is the number of times of oversampling for canceling chattering to the ‘ON’ or ‘OFF’

operation. If the continuance of the ‘ON’ or ‘OFF’ operations is lower than this register, the

operations are ignored. If this register value is ‘0’, the number of times of oversampling is ‘1’.

Sampling rate：About 14.8msec.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xD1

OST[3:0]

-

R/W

-

Initial val.

0

【0xDF : Mask interrupt】

Name: MASK_INTERRUPT

Address: 0xDF

Description: This register is for mask to the interrupt factor. The masked interrupt factor is not shown on the register

‘Interrupt factor (address 0x10)’, so it does not affect to output port INT.

1 : Masked 0 : Unmasked (default)

MSK_CAL : Mask for Software-calibration finish :

This bit does mask to the interrupt of Software-calibration finish (the bit CAL in the register ‘Interrupt factor’

(address 0x10)).

MSK_ERCAL : Mask for Self-calibration finish :

This bit does mask to the interrupt of Self-calibration finish (the bit ERCAL in the register ‘Interrupt factor’

(address 0x10)).

MSK_PERCAL : Mask for Periodic calibration finish :

This bit does mask to the interrupt of Periodic calibration finish (the bit PERCAL in the register ‘Interrupt

factor’ (address 0x10)).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xDF

-

MSK_PERCAL

-

MSK_ERCAL

MSK_CAL

-

R/W

-

R/W

-

R/W

-

Initial val.

0

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【0xE0-0xEB : Configuration of PWM】

Name: PWM_CFG

Address: 0xE0 – 0xEB

Description: Each of the 4 PWM timers (PWM-0/1/2/3) has 5 parameters.

When the register for PWM operation (0xFC) is changed from 0 to 1, these setting will be enabled.

I. RIS_PWM*：Rising Time Adjustment range : 0x0 ≤ RIS_PWM ≤ 0xF

Rising Time = About 317msec x RIS_PWM* (0 ≤ Rising Time ≤ 4755 [msec])

II. FAL_PWM*：Falling Time Adjustment range : 0x0 ≤ FAL_PWM ≤ 0xF

Falling Time = About 317msec x FAL_PWM* (0 ≤ Falling Time ≤4755 [msec])

III. ON_PWM*：Lights-On Time. Adjustment range : 0x1 ≤ RIS_PWM ≤ 0xF.

Lights-On Time = About 300msec x ON_PWM* (300 ≤ Lights-On Time ≤ 4500 [msec])

If the setting value is 0x0, the PWM timer continues to lighting. In the case of continuous lighting, the

way how to turn off the light is to change the value of the register for PWM operation (0xFC) from 1 to

0.

IV. OFF_PWM*：Lights-Off Time. Adjustment range : 0x0 ≤ OFF_PWM ≤ 0xF

Lights-Off Time = About 300msec x OFF_PWM* (0 ≤ Lights-Off Time ≤ 4500 [msec])

V. REP_PWM*：Repeat Count.

In the case that the setting value is 0x0 or 0x1, non repeat.

In the case that the setting value is 0xF, unlimited repeat.

In the case that the setting value is from 0x2 to 0xE, repeat as many times as the setting value.

When the PWM function is finished, the bit PWM which is included in ‘Interrupt factor’ register (0x10)

will be set to 1 and the level of the port INT will be High-Level. The bit PWM which is included in

‘Interrupt factor’ register is cleared by the writing 0 to the bit PWM which is included in ‘Interrupt clear’

register. And FAL_PWM is applied in the falling time.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xE0

FAL_PWM0[3:0]

RIS_PWM0[3:0]

0xE1

OFF_PWM0[3:0]

ON_PWM0[3:0]

0xE2

-

REP_PWM0[3:0]

0xE3

FAL_PWM1[3:0]

RIS_PWM1[3:0]

0xE4

OFF_PWM1[3:0]

ON_PWM1[3:0]

0xE5

REP_PWM1[3:0]

0xE6

FAL_PWM2[3:0]

RIS_PWM2[3:0]

0xE7

OFF_PWM2[3:0]

ON_PWM2[3:0]

0xE8

REP_PWM2[3:0]

0xE9

FAL_PWM3[3:0]

RIS_PWM3[3:0]

0xEA

OFF_PWM3[3:0]

ON_PWM3[3:0]

0xEB

REP_PWM3[3:0]

R/W

Initial val.

0

[ 0xEC : Mask Interrupt of PWM continuous flashing]

Name: MASK_PWM_FINISH

Address: 0xEC

Description: This register is the mask function for the interrupt of the end of the each LED PWM drive.

1 : Masked 0 : Unmasked (default)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xEC

-

MSK_PWM3

MSK_PWM2

MSK_PWM1

MSK_PWM0

R/W

-

R/W

Initial val.

0

Figure 7. PWM waveform

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【0xED-0xEE : LED-PWM assign】

Name: PWM_ASSIGN

Address: 0xED – 0xEE

Description: These registers are used to set any PWM setting from the four settings to each LED port.

0x0 : Assign PWM-0

0x1 : Assign PWM-1

0x2 : Assign PWM-2

0x3 : Assign PWM-3

These registers value is set by writing ‘1’ to the Switch PWM assign register (Address = 0xF9).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xED

PWMA_LED3[1:0]

PWMA_LED2[1:0]

PWMA_LED1[1:0]

PWMA_LED0[1:0]

0xEE

-

PWMA_LED4[1:0]

R/W

Initial val.

0

【0xEF : LED calibration】

Name: LED_CALIB

Address: 0xEF

Description: This register is used to select whether to perform the calibration. The calibration is done by writing to any

LED port or by periodic calibration.

LEDCAL : Self-calibration enable bit at controlled for LED/PWM :

This register is used to select whether to perform the self-calibration when the corresponding registers for

LED/PWM control are written. The corresponding registers’ addresses are from 0xF9 to 0xFC.

1 : Not perform the self-calibration. 0 : Perform the self-calibration (default).

PERCAL : Periodical calibration :

This register is used to select whether to perform the periodical calibration.

1 : Not perform the periodical calibration. 0 : Perform the periodical calibration (default).

PERCALCOND : Condition of the periodical calibration :

This register is used to select the condition to perform the periodical calibration.

1 : Always. 0 : At any LED port is lighting (default).

PWMCAL : Condition of the periodical calibration when the PWM function is active :

This register is used to select whether to perform the periodical calibration in the case that the periodical

calibration is enable.

1 : Perform the periodical calibration regardless of the condition of the LED port assigned to PWM function.

0 : Perform the periodical calibration only the LED port assigned to PWM function is set to inactive (default).

PERCAL PWMCAL

0 Not performed

1 Performed

0

1

0

1

0

1

Not performed

Performed

Not performed

Periodical Calibration

0

1

bit state

Conditions

State of the LED port assigned to PWM function

With flashing by PWM drive.

Without flashing by PWM drive.

0

1

PERIOD[7:4] : Interval of the periodical calibration :

This register is used to set the interval of the periodical calibration.

The interval of the periodical calibration = About 5 seconds x (PERIOD + 1)

(5 seconds ≤ Interval time ≤ 80 seconds)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xEF

PERIOD[3:0]

PWMCAL

PERCALCOND

PERCAL

LEDCAL

R/W

Initial val.

0

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【0xF0 : Clear Interrupt】

Name: CLR_INTERRUPT

Address: 0xF0

Description: Clear Interrupt Register.

INI : Clear Interrupt of Initialization finish :

Clear the INI interrupt by writing ‘0’ to this register. If the written value is ‘1’, the operation is not valid.

CAL : Clear Interrupt of Software-calibration finish :

Clear the CAL interrupt by writing ‘0’ to this register. If the written value is ‘1’, the operation is not valid.

ERCAL : Clear Interrupt of Self-calibration finish :

Clear the ERCAL interrupt by writing ‘0’ to this register. If the written value is ‘1’, the operation is not valid.

PERCAL : Clear Interrupt of Periodic calibration finish :

Clear the PERCAL interrupt by writing ‘0’ to this register. If the written value is ‘1’, the operation is not

valid.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xF0

-

PERCAL

-

ERCAL

CAL

INI

R/W

-

R/W

-

R/W

Initial val.

-

0

-

0

【0xF1 : Clear Switch-On】

Name: CLR_DETECT_ON

Address: 0xF1

Description: DETECT_ON Clear Register. Clear the DETECT_ON by writing ‘0’ in these registers. If the written

value is ‘1’, the operation is not valid.

1 : Invalid. 0 : Clear.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xF1

-

ON_SW4

ON_SW3

ON_SW2

ON_SW1

ON_SW0

R/W

-

R/W

Initial val.

0

【0xF2 : Clear Switch-Off】

Name: CLR_DETECT_OFF

Address: 0xF2

Description: DETECT_OFF Clear Register. Clear the DETECT_OFF by writing ‘0’ in these registers. If the written

value is ‘1’, the operation is not valid.

1 : Invalid. 0 : Clear.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xF2

-

OFF_SW4

OFF_SW3

OFF_SW2

OFF_SW1

OFF_SW0

R/W

-

R/W

Initial val.

0

【0xF3: Clear continuous touch】

Name: CLR_DETECT_CONT

Address: 0xF3

Description: DETECT_CONT Clear Register. Clear the DETECT_CONT by writing ‘0’ to these registers. If the

written value is ‘1’, the operation is not valid.

1 : Invalid. 0 : Clear.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xF3

-

CONT_SW4

CONT_SW3

CONT_SW2

CONT_SW1

CONT_SW0

R/W

Initial val.

0

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【0xF4 : Clear Interrupt of PWM continuous flashing】

Name: CLR_DETECT_PWM_FINISH

Address: 0xF4

Description: DETECT_PWM_FINISH Clear Register. Clear the DETECT_PWM_FINISH by writing ‘0’ to these registers.

If the written value is ‘1’, the operation is not valid.

1 : Invalid. 0 : Clear.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xF4

-

PWM3

PWM2

PWM1

PWM0

R/W

-

R/W

Initial val.

0

【0xF9 : Switch PWM assign】

Name: PWM_SWITCH

Address: 0xF9

Description: CFG : Switch PWM assign :

If the written value is ‘1’, the PWM configurations (Address from 0xED to 0xEE) are valid.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xF9

-

CFG

R/W

-

R/W

Initial val.

0

【0xFA : Control LED port】

Name: LED_CNT

Address: 0xFA

Description: This register is used to control each LED port.

1 : Always On (High drive) 0 : Always Off (Low drive)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xFA

-

LED4_EN

LED3_EN

LED2_EN

LED1_EN

LED0_EN

R/W

-

R/W

Initial val.

0

【0xFB : Select PWM】

Name: PWM_SELECT

Address: 0xFB

Description: This register is used to select whether PWM function for each LED port.

1 : Use PWM function. 0 : Not use PWM function (default).

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xFB

-

PWMS_LED4

PWMS_LED3

PWMS_LED2

PWMS_LED1

PWMS_LED0

R/W

-

R/W

Initial val.

0

【0xFC : Control PWM function】

Name: PWM_CNT

Address: 0xFC

Description: This register is used to control PWM function.

By writing ‘1’ to the register which value is ‘0’, the PWM function is started.

By writing ‘0’ to the register which value is ‘1’, the PWM function is stopped.

In the case that the PWM function is finished by reaching repeat number, set ‘0’ to this register for the next

operation of PWM function.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xFC

-

PWM3_EN

PWM2_EN

PWM1_EN

PWM0_EN

R/W

-

R/W

Initial val.

0

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【0xFE : Write register for operation check of IC】

Name: WACT

Address: 0xFE

Description: This register is a write register for operational check of the IC. This register’s value is copied to the read

register for operation check (Address is 0x1E). If the write value and the read value are equal, MPU and

I/F are operating normally.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xFE

WACT[7:0]

R/W

Initial val.

0

【0xFF : AFE Control】

Name: CNT

Address: 0xFF

Description: This register is for controlling AFE.

ACT : Scan Enable :

This bit is the scan enable for AFE.

1 : Scan Enable. 0 : Scan Disable.

CAL : Act Soft-calibration :

The calibration is operated by setting ‘1’.

CFG : Enable Configuration Value :

Writing ‘1’ to this bit, the value of Sensor configuration (address from 0xC0 to 0xD1), Mask Configuration

(address 0xDF), Mask Interrupt of PWM continuous flashing (address = 0xEC), LED calibration (address =

0xEF), FRCRLS and CALOVF are effective to the IC’s operation.

CALMOD : Select Software-calibration mode :

0: All sensors are the targets for soft-calibration. If some sensor has the value more than the threshold for

‘OFF’ to ‘ON’, the sensors are changed to ‘OFF’, and DETECT_OFF register is enabled (default).

1: The sensors with the value more than the threshold for ‘OFF’ to ‘ON’ are not calibrated.

CALOVF : Select Self-calibration mode detected overflow :

When the periodic calibration is active, it selects whether to activate self-calibration or not to activate in the

case that the sensor values are over the dynamic range of included ADC.

0: Deactivate self-calibration (default). 1: Activate self-calibration

FRCRLS : Select Force OFF at continuous touch :

When the continuous touch is active, select whether to activate force OFF or not in the case that the max

value after detect continuous touch minus the current sensor value is more than the threshold for ‘OFF’ to

‘ON’.

0 : Deactivate force OFF (default). 1: Activate force OFF.

By force OFF is performed, the continuous touch sensor is changed to OFF, and DETECT_OFF register is

enabled.

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0xFF

FRCRLS

CALOVF

-

CALMOD

-

CFG

CAL

ACT

R/W

-

R/W

-

R/W

Initial val.

0

-

0

-

0

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Timing Charts

Host interface

2-wire serial bus.

Compatible with I2C protocol.

Support slave mode only.

7-bit Slave Address = 0x4C (in the case of ADR = ‘L’), 0x4D (in the case of ADR = ‘H’).

Standard-mode (data transfer rate of 100kbit/s), Fast-mode (data transfer rate of 400kbit/s).

Supports sequential read.

S

1-7 8 9

P

1-7 8 9 1-7 8 9

SDA

tLOW

tHD;STA

SCL

repeated

START

condition

tHD;DAT tHIGH

tHD;STA

tSU;STA

tSU;DAT tBUF

tSU;STO STOP

condition

START

condition

START

condition

* It is necessary that interval time for writing to register which address is from 0xF0 to 0xFF is more than 650usec.

Parameter

Symbol

Standard-mode

Fast-mode

Unit

MIN

MAX

MIN

MAX

SCL clock frequency

fSCL

0

100

0

400

kHz

Hold time (repeated) START condition

tHD;STA

4.0

-

0.6

-

usec

LOW period of the SCL clock

tLOW

4.7

-

1.3

-

usec

HIGH period of the SCL clock

tHIGH

4.0

-

0.6

-

usec

Data hold time

tHD;DAT

0.1

3.45

0.1

0.9

usec

Data set-up time

tSU;DAT

0.25

-

0.1

-

usec

Set-up time for a repeated START condition

tSU;STA

4.7

-

0.6

-

usec

Set-up time for STOP condition

tSU;STO

4.0

-

0.6

-

usec

Bus free time between STOP and START condition

tBUF

4.7

-

1.3

-

usec

SDA

SCL

START

Address

ACK

Data

ACK

STOP

NACK

/ ACK

R/W

Figure 8. 2-wire serial bus data format

Figure 9. 2-wire serial bus data timing chart

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・Byte Write

S W A A A S

T R C C C T

A I K K K O

R T P

T E

S S S S S S S R R R R R R R R W W W W W W W W

A A A A A A A A A A A A A A A D D D D D D D D

6543210 76543210 76543210

・Random Read

S W A A S R A N S

T R C C T E C A T

A I K K A A K C O

R T R D K P

T E T

S S S S S S S R R R R R R R R S S S S S S S R R R R R R R R

A A A A A A A A A A A A A A A A A A A A A A D D D D D D D D

6543210 76543210 6543210 76543210

・Sequential Read

S W A A S R A A A N S

T R C C T E C C C A T

A I K K A A K K K C O

R T R D K P

T E T

S S S S S S S R R R R R R R R S S S S S S S R R R R R R R R R R R R R R R R R R

A A A A A A A A A A A A A A A A A A A A A A D D D D D D D D D D D D D D D D D D

6543210 76543210 6543210 76543210 7 0 76543210

READ

DATA

(n+x)

(= 0x4C or 0x4D)

READ

DATA

(n)

REGISTER

ADDRESS

(n)

ADDRESS

SLAVE

(n)

READ

DATA

ADDRESS

(n)

ADDRESS

WRITE

DATA

(n)

SLAVE

REGISTER

ADDRESS

(n)

REGISTER

ADDRESS

SLAVE

ADDRESS

SLAVE

ADDRESS

SLAVE

Scan Rate

After scan each sensor in time series, MPU convert to the switch operations from the detected results.

One scan rate is about 14.8msec at typical.

SIN0

SIN1

SIN2

SIN3

SIN4

Data update

Scan rate = 14.8msec (OSC = 50MHz)

SA : Slave Address

RA : Register Address

RD : Read Data

WD : Write Data

Figure 10. 2-wire serial bus protocol

Figure 11. Timing chart of scan rate

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Power on sequence

Power supply pin is VDD only. AVDD and DVDD are supplied by each LDO included this IC, so that have no priority

about power on sequence. When VDD reaches to the effective voltage, power-on-reset which initializes the digital block

is released.

Power-on-reset is monitoring VDD, so it needs that decoupling capacitor’s value is suitable for VDD rising time. (DVDD’s

rising time < VDD’s rising time.)

C1

VDD

VSS

GND

DVDD

AVDD

BU21170MUV C2

C3

When power-on-reset is released, MPU starts initial sequence. Inform by the INT port to the host that the initialization

has been completed. After verify that the initialization has been completed, the host will need to resend the command

to this IC.

In the case that WDTR is released as well, MPU starts initial sequence. If WDTR has released, all registers of this IC

have been initialized. So the host will need to resend the command to this IC.

VDD

Power on Reset

(ActiveLow)

Initialize IC about 300usec

Hi-Z about 100usec

port LED

Interrupt of Initialization Done

port INT

C1

0.1uF

VDD decoupling capacitor

C2

1.0uF

DVDD decoupling capacitor

C3

2.2uF

AVDD decoupling capacitor

Recommended value of external capacitors

Over 100usec

AVDD

VDD

DVDD

2.73V

1.50V

3.30V

Figure 13. Timing chart of power on sequence

Figure 12. Arrangement of external decoupling capacitors

Figure 14. Timing chart of initialization

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Initialize operation

This IC is initialized and all registers are cleared by Power-on reset, WDT time-out reset, and Software reset command.

When initialization is complete, the register INI is set to ‘1’ and I/O port INT is set to ‘H’.

After the IC is initialized, write the configuration values to registers. After setting configuration values, the next action is

sensor calibration. Set ‘1’ to the registers ACT, CFG and CAL on Address 0xFF, so calibration sequence is performed.

IC’s initialization after hardware reset

Power-on-reset

WDTR (Watchdog timer timeout reset)

Software reset command

The above actions act hardware reset to the IC. Hardware reset clear the all registers to the default value and initialize

MPU. After hardware reset, MPU runs the initial sequence of firmware on Program ROM.

Power supply Effect software resetOutbreak WDT timeout

INT

and

interrupt for completion of

initialization

(Register INTERRUPT

bit INI)

= 1

Finish initialization

Clear interrupt for

completion of initialization

(Register)

Yes

No

Figure 15. Initialization routine after hardware reset

Figure 16. Configuration sequence including clear interrupts

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Calibration

Self-calibration

Self-calibration is performed by this IC automatically. It is performed in the following cases.

1. Detect drift condition :

When the IC detects the drift condition, the IC acts self-calibration. When calibration is complete, the interrupt

factor register CAL is set to ‘1’ and I/O port INT is set to ‘H’. When there is the sensor with the sensor value more

than the threshold for ‘Off to On’, IC does not detect drift condition. The interrupt factor register CAL is maskable

by the mask interrupt register CAL. The interrupt factor register CAL is cleared by writing ‘1’ to the interrupt clear

register CAL.

2. Detect noise :

When the IC detects the noise, the IC changes the scan rate to not synchronize with the noise, and the IC acts

self-calibration. When calibration is complete, the Interrupt factor register CAL is set to ‘1’ and I/O port INT is set

to ‘H’. The interrupt factor register CAL is maskable by the mask interrupt register CAL. The interrupt factor

register CAL is cleared by writing ‘1’ to the interrupt clear register CAL.

3. Detect incorrect operation :

When the finger is on the sensor at the calibration, the sensor base state is with the finger. Without the finger,

the sensor value is under the base state value. This abnormal condition is defined to incorrect operation.

Detected incorrect operation, the IC acts self-calibration. The interrupt factor register CAL is maskable by the

mask interrupt register CAL. The interrupt factor register CAL is cleared by writing ‘1’ to the interrupt clear register

CAL.

Software-calibration

Software-calibration is performed by the command from the host.

1. Write ‘1’ to the Act Software-calibration bit.

2. Finishing the calibration, the Software-calibration finish bit (CAL on Address0x10) is set to ‘1’ and I/O port INT

is set to ‘H’. For next calibration, clear the interrupt.

When the sensor setting value is changed, it is necessary to execute a soft calibration. It is necessary for

changing the value of the sensor setting that the scan is disabled.

In the act of calibration, sensor values are not changed. So the switching operations are invalid.

If the software-calibration is released at sensing sensors, IC acts calibration at next sensing sensors.

LED calibration

When the register for LED/PWM drivers operation (address area from 0xF9 to 0xFC) is written, this IC is selectable

whether to perform self-calibration. Selecting whether to perform the LED calibration is defined by the configuration

for calibration register (LEDCAL on Address 0xEF).

If there is the writing to the register for LED/PWM drivers operation (address area from 0xF9 to 0xFC), when the

finger on the sensors. Incorrect operation will be detected at the finger leaving, and so IC will act self-calibration.

Periodical calibration

The periodical calibration is to perform self-calibration periodically. This IC is selectable whether to perform

periodical calibration. Selecting whether to perform the periodical calibration is defined by the configuration for

calibration register (PERCAL on Address0xEF).

The sensor with the finger is not calibrated by the periodical calibration.

Whenever periodical calibration is complete, the interrupt factor register PERCAL is set to ‘1’ and I/O port INT is set

to ‘H’. The interrupt factor register PERCAL is maskable by the mask interrupt register PERCAL. The interrupt factor

register CAL is cleared by writing ‘1’ to the interrupt clear register PERCAL.

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Interrupt when multi calibration factor occurs

The calibration of the four factors to carry out the calibration is different respectively. Therefore, state the calibration

of another is started during the conduct of certain calibration, the conflict occurs.

If the calibration different conditions occur in the middle of the calibration, calibration being performed to stop, a new

calibration is carried out from the beginning.

The interrupt by finishing the first factor’s calibration is set, and the interrupt by the new factor’s calibration is set

too.

Calibration factor α occurs.

Calibration factor β occurs.

Start calibration by factor α.

Start calibration by factor β.

Interrupt calibration finish of factor α.

Interrupt calibration finish of factor β.

Interrupt of each factor is output.

ADC value

Figure 17. Interrupt when multi calibration factor occurs

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Switch operation

Every sensor is used for simple switch. Each switch has the registers of detected Touch/Release/Hold operations.

Every switch supports to multi-detect Touch/Release/Hold. Unused switches are maskable.

Case1 Long push setting CONTSEL = 1

SIN0(sensor ON/OFF）

key ON recognition(SW0)

key long pus h recognition(SW0)

key OFF recognition(SW0)

Port INT

Case2 Long push setting CONTSEL = 0

SIN0(sensor ON/OFF）

key ON recognition(SW0)

key long pus h recognition(SW0)

key OFF recognition(SW0)

Port INT

Setting of long push tim e

Send clear com mand for interrupt of SW0 ON

Send clear com mand for interrupt of SW0 long push

Send clear command for interrupt of SW0 OFF

Setting of long push tim e

Send clear com mand for interrupt of SW0 ON

Send clear comm and for interrupt of SW0 long push

Send clear command for interrupt of SW0 OFF

SIN0(sensor ON/OFF）

key ON recognition(SW0)

key OFF recognition(SW0)

SIN1(sensor ON/OFF）

key ON recognition(SW1)

key OFF recognition(SW1)

Port INT

Send clear com mand for interrupt of SW1 OFF

Send clear command for interrupt of SW1 ON

Send clear command for interrupt of SW0 ON

Send clear com mand for interrupt of SW0 OFF

Figure 18. Interrupt of switch operation (1)

Figure 19. Interrupt of switch operation (2)

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Interrupt of PWM continuous flashing

When PWM configuration is set to not always lights, PWM drive repeat as many times as the setting value. The interrupt is

released at finishing PWM drive.

In the case that PWM always lights, the way to turn PWM off is to write ‘0’ to the Control PWM function register which value

is ‘1’, and the interrupt is released at finishing PWM drive. However, if you restart the PWM timer before the PWM timer will

not finish, the interrupt is not released.

Figure 20. Interrupt of PWM drive

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Operational Notes

1. Reverse Connection of Power Supply

Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when

connecting the power supply, such as mounting an external diode between the power supply and the IC’s power supply

terminals.

2. Power Supply Lines

Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the

digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog

block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and

aging on the capacitance value when using electrolytic capacitors.

3. Ground Voltage

Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition.

4. Ground Wiring Pattern

When using both small-signal and large-current ground traces, the two ground traces should be routed separately but

connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal

ground caused by large currents. Also ensure that the ground traces of external components do not cause variations

on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance.

5. Thermal Consideration

Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in

deterioration of the properties of the chip. The absolute maximum rating of the Pd stated in this specification is when

the IC is mounted on 74.2mm x 74.2mm x 1.6mm glass epoxy 1layer board (Copper foil area : 10.29mm2). In case of

exceeding this absolute maximum rating, increase the board size and copper area to prevent exceeding the Pd rating.

6. Recommended Operating Conditions

These conditions represent a range within which the expected characteristics of the IC can be approximately obtained.

The electrical characteristics are guaranteed under the conditions of each parameter.

7. Rush Current

When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may flow

instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power supply.

Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and routing

of connections.

8. Operation Under Strong Electromagnetic Field

Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.

9. Testing on Application Boards

When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may subject

the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should

always be turned off completely before connecting or removing it from the test setup during the inspection process. To

prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and

storage.

10. Inter-pin Short and Mounting Errors

Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in

damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin.

Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and

unintentional solder bridge deposited in between pins during assembly to name a few.

11. Unused Input Terminals

Input terminals of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance

and extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small

charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and

cause unexpected operation of the IC. So unless otherwise specified, unused input terminals should be connected to

the power supply or ground line.

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12. Regarding the Input Pin of the IC

In the construction of this IC, P-N junctions are inevitably formed creating parasitic diodes or transistors. The operation

of these parasitic elements can result in mutual interference among circuits, operational faults, or physical damage.

Therefore, conditions which cause these parasitic elements to operate, such as applying a voltage to an input pin lower

than the ground voltage should be avoided. Furthermore, do not apply a voltage to the input terminals when no power

supply voltage is applied to the IC. Even if the power supply voltage is applied, make sure that the input terminals have

voltages within the values specified in the electrical characteristics of this IC.

13. Ceramic Capacitor

When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with

temperature and the decrease in nominal capacitance due to DC bias and others.

14. Area of Safe Operation (ASO)

Operate the IC such that the output voltage, output current, and power dissipation are all within the Area of Safe

Operation (ASO).

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Ordering Information

B

U

2

1

7

0

M

U

V

-

E 2

Part Number

Package

MUV: VQFN020V4040

Packaging and forming specification

E2: Embossed tape and reel

Marking Diagram

VQFN020V4040 (TOP VIEW)

21170

Part Number Marking

LOT Number

1PIN MARK

B U

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Physical Dimension, Tape and Reel Information

Package Name

VQFN020V4040

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Revision History

Date

Revision

Changes

31.Oct.2013

001

New Release

14.Jul.2016

002

P3 Figure 6. Block Diagram

Correct wiring error to the block PoR.

P7 Correct clerical error

(old) couth

(new) touch

P7 Correct clerical error

(old) ’Detection continued touch’

(new) ’Detection continuous touch’

P13 Correct clerical error

(old) the periodical :

(new) the periodical calibration :

P13 Correct clerical error

(old) the periodical when

(new) the periodical calibration when

P14 Correct clerical error

(old) Clear the INI interrupt

(new) Clear the PERCAL interrupt

P19 Correct clerical error

(old) the initialization ha completed,

(new) the initialization has been completed,

P20 Correct clerical error in Figure 15.

(old) Resister

(new) Register

Notice-PGA-E Rev.003

Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN

USA

EU

CHINA

CLASSⅢ

CLASSⅡb

CLASSⅢ

CLASSⅣ

CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which

a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way

responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any

special or extraordinary environments or conditions. If you intend to use our Products under any special or

extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of

product performance, reliability, etc, prior to use, must be necessary:

[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents

[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust

[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,

H2S, NH3, SO2, and NO2

[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves

[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items

[f] Sealing or coating our Products with resin or other coating materials

[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of

flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning

residue after soldering

[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in

the range that does not exceed the maximum junction temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must

be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,

please consult with the ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Notice-PGA-E Rev.003

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

characteristics of the Products and external components, including transient characteristics, as well as static

characteristics.

2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

responsible for it and you must exercise your own independent verification and judgment in the use of such information

contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses

incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be

applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,

isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

which storage time is exceeding the recommended storage time period.

Precaution for Product Label

A two-dimensional barcode printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition

When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act

Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign

trade act, please consult with ROHM in case of export.

Precaution Regarding Intellectual Property Rights

1. All information and data including but not limited to application example contained in this document is for reference

only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any

other rights of any third party regarding such information or data.

2. ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the

Products with other articles such as components, circuits, systems or external equipment (including software).

3. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any

third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM

will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to

manufacture or sell products containing the Products, subject to the terms and conditions herein.

Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

DatasheetDatasheet

Notice – WE Rev.001

General Precaution

1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.

ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny

ROHM’s Products against warning, caution or note contained in this document.

2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior

notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s

representative.

3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all

information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or

liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or

concerning such information.

Datasheet

Part Number bu21170muv

Package VQFN020V4040

Unit Quantity 2500

Minimum Package Quantity 2500

Packing Type Taping

Constitution Materials List inquiry

RoHS Yes

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