MLX90291BCKDC - Melexis, Inc.

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 1 of 17 Data Sheet

Rev 001 April 2011

Features and Benefits

 Programmable Hall effect sensor

 12-bit 125Hz PWM output signal

proportional to the magnetic flux density

 Switch function

 Measurement range from ±15mT to ±400mT

 Low noise output signal (PWM jitter)

 Programmable through the connector (supply,

ground & output)

 16 bit customer ID number (48 bit MLX ID for

traceability purposes)

 SOIC8 package RoHS compliant

 Lead free component, suitable for lead free

soldering profile 260°C

Application Examples

 Rotary position sensor

 Linear position sensor

 Contactless switch

Ordering Information

Part No. Temperature Code Package Code Option code

MLX90291BC K (-40°C to 125°C) DC (SOIC8) -

1 Functional Diagram

Hall

Bias

Integrating

P2P

DIDO

Phase

Switch

Box

fs = 1MHz

Oscillator

1 MHz

Clock

Generator

I = 4 x 0.35mA

S = 80mV/T

Vh= 4mV @50mT

G = 15 … 190 G = 4

fs = 1MHz

Input data rate

Voltage

Regulator

DIGITAL + EEPROM

RG[2:0] ATTN2P5

3.3V core

TC1ST[6:0]

TC2ND[5:0]

ADC

PWM Logic

Test

Controller

TEST1

TEST2

TEST3

VDD

VSS

3.3V

ana

3.3V

dig

fc = 1MHz

digital clock

f = 15kHz

data conversion

rate

Control lines

OUTPUT

Program.

Attenuation

1 or 4.5

TEST5

OUT

TEST4

Reverse

Polarity

Protection

Figure 1: Block diagram

2 General Description

The MLX90291 is a monolithic programmable linear hall sensor IC, which can provide a PWM output signal

proportional to the externally applied magnetic flux density or act as a switch with a programmable threshold

level. The transfer characteristic of the MLX90291 is fully programmable (offset, gain, clamping levels, …).

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 2 of 17 Data Sheet

Rev 001 April 2011

3 Table of Contents

1 Functional Diagram................................................................................................................................................................................ 1

2 General Description............................................................................................................................................................................... 1

3 Table of Contents .................................................................................................................................................................................. 2

4 History ................................................................................................................................................................................................... 2

5 Glossary of Terms ................................................................................................................................................................................. 3

6 Absolute Maximum Ratings ................................................................................................................................................................... 3

7 Pin Definitions and Descriptions ............................................................................................................................................................ 3

8 General Electrical Specifications............................................................................................................................................................ 4

9 Magnetic specification ........................................................................................................................................................................... 4

10 Timing specification ............................................................................................................................................................................. 5

11 PWM output specification .................................................................................................................................................................... 6

12 Fault modes......................................................................................................................................................................................... 6

13 Programmable Items ........................................................................................................................................................................... 7

13.1 Parameter table............................................................................................................................................................................ 7

13.2 Output mode configuration (OUTMODE) ...................................................................................................................................... 7

13.3 Sensitivity programming (ROUGHGAIN, FINEGAIN).................................................................................................................... 7

13.4 Offset / output quiescent voltage programming (XA, YA) .............................................................................................................. 8

13.5 Clamping level programming (CLAMP)......................................................................................................................................... 9

13.6 Bandwidth and filter programming (FILTCODE)............................................................................................................................ 9

13.7 Current limitation (OUTSLOPE).................................................................................................................................................... 9

13.8 PWM Mode duty cycle definition (DCDEF) ................................................................................................................................. 10

13.9 Sensitivity and temperature drift programming (TC1ST, TC2ND)................................................................................................ 11

13.10 Offset temperature drift programming (OFFDRIFT) .................................................................................................................. 11

13.11 Functional mode (SWITCH)...................................................................................................................................................... 11

13.12 Polarity (PLATEPOL)................................................................................................................................................................ 11

13.13 Attenuator (ATTN2P5).............................................................................................................................................................. 12

13.14 Customer ID (CSTID) ............................................................................................................................................................... 12

14 Recommended Application Diagrams................................................................................................................................................ 13

14.1 Resistor and Capacitor Values ................................................................................................................................................... 13

14.2 Pull down resistor for diagnostic low ........................................................................................................................................... 13

14.3 Pull up resistor for diagnostic high .............................................................................................................................................. 13

15 Standard information regarding manufacturability of Melexis products with different soldering processes.......................................... 14

16 ESD Precautions ............................................................................................................................................................................... 14

17 Package Information.......................................................................................................................................................................... 15

17.1 SOIC8 Package Dimensions ...................................................................................................................................................... 15

17.2 SOIC8 Pin Out and Marking ....................................................................................................................................................... 15

17.3 SOIC8 Hall plate positioning....................................................................................................................................................... 16

18 Disclaimer.......................................................................................................................................................................................... 17

4 History

Rev 001 Initial version (April 2011)

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 3 of 17 Data Sheet

Rev 001 April 2011

5 Glossary of Terms

Tesla Units for the magnetic flux density, 1 mT = 10 Gauss

TC Temperature Coefficient in ppm/°C

NC Not Connected

ADC Analog-to-Digital Converter

PTC Programming Through Connector

POR Power on Reset

INL Integral Non Linearity

DNL Differential Non Linearity

PWM Pulse Width Modulation

6 Absolute Maximum Ratings

Parameter Symbol Value Units

Positive Supply Voltage (over-voltage) Vdd +20 V

Reverse Supply Voltage Protection -10

-14 (200s max, T

= +25°C)

Positive Output Voltage +10

+14 (200s max, T

= +25°C)

Output

Current

Iout

Reverse Output Voltage

(1)

-5 V

Reverse Output Current

(1)

-50 mA

Operating Ambient Temperature Range T

-40 to +150 °C

Storage Temperature Range T

-55 to +150 °C

Magnetic Flux Density ± 10 T

Table 1: Absolute maximum ratings

(1) Realized through an on-chip resistor along the output line

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute maximum

rated conditions for extended periods may affect device reliability.

7 Pin Definitions and Descriptions

Pin № Name Type Function

1 VDD Supply Supply Voltage

VSS

Ground

Voltage

3 TEST4 N/A MLX Test and factory calibration

4 OUT Digital Sensor output signal

5 TEST5 N/A MLX Test and factory calibration

6 TEST3 N/A MLX Test and factory calibration

7 TEST2 N/A MLX Test and factory calibration

8 TEST1 N/A MLX Test and factory calibration

Table 2: Pin definition and description – S08 package

It is recommended to connect the MLX test pins to the Ground for optimal EMC results. See section 14 for a

recommended application diagram

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 4 of 17 Data Sheet

Rev 001 April 2011

8 General Electrical Specifications

Operating Parameters T

= -40

C to 125

C, Vdd = 5.0 V, using recommended application diagram, unless

otherwise specified.

Parameter Symbol Test Conditions Min Typ Max Units

Nominal Supply Voltage V

4.5 5 5.5 V

Supply Current I

8 10 mA

Peak Supply Current I

DDpeak

During power-up and PWM switching 15 mA

Reset Voltage

(POR)

POR

2.2

2.7

POR Threshold Hysteresis V

PORHYST

0.3 V

Operating Threshold (rising) V

OPERATING

3.3 3.8 V

Under-Voltage Threshold (falling) V

UNDER

Immediate diagnostic low without reset

in case of recovery 2.7 3 V

Operating / Under

Voltage Threshold

Hysteresis

HYST

0.1 V

Programming Voltage V

PROG

Not Locked Part

Output = High Impedance 6.7 7.4 7.7

(1)

Overvoltage detection V

OVER

Output = High Impedance 7.5

(1)

8.5 V

Load

resistance range

(Pull

up/down)

Pull-up OUT to 5V 2 4.7 kΩ

Load Capacitor range C

Between OUT and GND 10 nF

SATPPHI

OUT

= + 2mA V

– 0.3

Output Saturation Voltage

Push Pull Mode V

SATPPLO

OUT

= – 2 mA 0.3 V

Output Saturation Voltage

Open Drain Mode

SATOD

OUT

= – 2 mA

Output = Low (Driver ON) 0.3 V

Output Leakage Current

Open Drain Mode

LEAKOD

OUT

= + 5 V

Output = High (Driver OFF) 2 10 µA

OUTSCGND

Current limitation fully ON + 15 + 28 mA

Output Short Circuit Current

OUTSCVDD

Current limitation

fully ON

–

Table 3: General electrical parameters

(1) No overlap possible at the same temperature

9 Magnetic specification

Operating Parameters T

= -40

C to 125

C, Vdd = 5.0 V, unless otherwise specified.

Parameter Symbol Test Conditions Min Typ Max Units

Magnetic Flux Density range B ±15 ±40 ±400 mT

Table 4: Magnetic specification

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 5 of 17 Data Sheet

Rev 001 April 2011

10 Timing specification

Operating Parameters T

= -40

C to 125

C, Vdd = 5.0 V, unless otherwise specified

Parameter Symbol Test Conditions Min Typ Max Units

Power Up Sequence t

ON1

0 < V

< V

POR

F(V

DDSR

) ms

ON2

POR

< V

OPERATING

F(V

DDSR

) ms

ON3

> V

OPERATING

& EEPROM CHECK OK

1 Cycle

Power Supply Slew rate(external) V

DDSR

0.0005 5 V/µs

EEPROM Check t

EEPROM

EEPROM dump + CRC check

0.5 1 ms

Main Oscillator Frequency F

OSC

Tolerance ± 10% 921 1024 1127 kHz

Tick Time t

TICK

0.98 µs

PWM Cycle Duration Cycle

PWM

TICK

8 ms

PWM Output Frequency F

PWM

OSC

125 Hz

Sampling Frequency F

SAMPLE

Analog sampling Fosc

Conversion Rate

@ F

OSC

= 1024 kHz

CONV

Measurement: 40 analog samples

Conversion (ADC): 25 µs 70 µs

Low pass filtering (First order filter)

@ F

OSC

= 1024 kHz

@ -3 db

FILTER

FILTCODE = 9

FILTCODE = 8

FILTCODE = 7

FILTCODE = 6

FILTCODE = 5

FILTCODE = 4

FILTCODE = 3

FILTCODE = 2

139

279

557

Output Slope current generator I

SLOPE

OUTSLOPE = 0

OUTSLOPE = 1

OUTSLOPE = 2

OUTSLOPE = 3

Table 5: Timing specification of the analog output

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 6 of 17 Data Sheet

Rev 001 April 2011

11 PWM output specification

Operating Parameters T

= -40

C to 125

C, Vdd = 5.0 V, unless otherwise specified

Parameter Symbol Test Conditions Min Typ Max Units

PWM Output Clamping SCG

PWM

CLAMP = 0

CLAMP = 1

CLAMP = 2

CLAMP = 3

CLAMP = 4

CLAMP = 5

CLAMP = 6

%DC

PWM Output Offset PWM

Programming Range 0 100 %DC

PWM Output Offset Resolution PWM

OQRES

Programming Resolution 0.025 %DC

PWM Output Slope

(or Sensitivity or Gain)

S 10%-90% Swing 0.1 1 6.4 %DC/mT

PWM Output Slope Resolution S

RES

% of Slope target value (fine gain) 0.025 %

PWM Resolution LSB

PWM

12 bits 0.0125 %DC

SWITCH Low Level Threshold range

SWITCH

Switch mode Programming range 0 100 %

SWITCH High Level Threshold

range

SWITCH

HIG

Switch mode Programming range 0 100 %

SWITCH Programming resolution

SWITCH

Switch mode Resolution 0.025 %

PWM Linearity

DNL

PWM

INL

PWM

13 bits resolution

40 mT

–

1%DC/mT

LSB

PWM

PWM Jitter JIT

PWM

S = 1% DC/mT

PWM

= 125 Hz

Filter setting: m=32

– 2 + 2 LSB

PWM

PWM Clamping Accuracy Clamp

ACC

– 2 + 2 LSB

PWM

Intrinsic Offset Thermal Drift ∆

Offset

25 °C to

40 °C

25 °C to 125 °C

– 0.1 + 0.1 mT

Thermal Sensitivity Drift ∆

S After calibration @ MLX

full temperature range – 150 0 + 150 ppm/°C

Sensitivity thermal coefficient

resolution

RES Incremental TC Adjust

5 bits over ± 800ppm/°C 50 ppm/°C

Table 6: PWM output specification

12 Fault modes

Operating Parameters T

= -40

C to 125

C, Vdd = 5.0 V, unless otherwise specified

Parameter Symbol Test Conditions Min Typ Max Units

Output signal in Fault state Fault

OUT

EEPR

OM parity fail

Pull resistor = 5K

4 - V

Parity Fail Criterion n

PARITY

Successive CRC fails before

Diagnostic is set

- 2 - Count

Broken VSS VBR

VSS

Pull-Up resistor = 5K 4 V

Broken VDD VBR

VDD

Pull-Up resistor = 5K 4 V

Table 7: Fault modes

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 7 of 17 Data Sheet

Rev 001 April 2011

13 Programmable Items

13.1 Parameter table

Parameter Bits Comment

OUTMODE 1 Push pull or open drain output drive

ROUGHGAIN 3 Rough gain preamplifier

FINEGAIN 13 Digital fine gain adjustment from -3.999 to +3.999

XA 14 Offset before gain

YA 15 Offset after gain, (Xa,Ya) defines the zero Gauss point

CLAMP 3 Clamp high and clamp low level

FILTCODE 4 Digital output filter

OUTSLOPE 2 Output Slope Control

DCDEF 1 PWM Duty Cycle Definition

TC1ST 7 Sensitivity temperature drift correction 1

order

TC2ND 6 Sensitivity temperature drift correction 2

order

OFFDRIFT 6 Residual Offset Correction

SWITCH 1 PWM/Switch mode

PLATEPOL 1 Invert Sensitivity Sign

ATTN2P5 1 Attenuator block switch

CSTID 16 Melexis ID

Table 8: Customer programmable items

13.2 Output mode configuration (OUTMODE)

OUTMODE configures the output driver.

OUTMODE Output Driver

0 PWM Open-drain

1 PWM Push-pull

Table 9: Output configuration

13.3 Sensitivity programming (ROUGHGAIN, FINEGAIN)

ROUGHGAIN[2:0]

This 3-bit register controls the gain of the pre-amplifier.

• The MSB controls the enable of the PREAMP function with a gain of 4.3 (~2mA extra I

)

• The 2 LSB control the gain of the MAINAMP

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 8 of 17 Data Sheet

Rev 001 April 2011

Value Typical Gain

0 15.0

1 21.6

2 31.1

3 44.8

4 64.5

5 92.9

6 133.7

7 192.6

Table 10: ROUGHGAIN versus amplifier gain

FINEGAIN[12:0]

Value defines the digital gain adjustment

• The code 1024 corresponds to a gain of 1

• The MSB is the sign bit which acts as a polarity bit

• FINEGAIN gain range is from -3.9999 to +3.99999

13.4 Offset / output quiescent voltage programming (XA, YA)

XA[13:0]

PWM mode: Offset trimming before FINEGAIN block

Switch mode: Threshold for the output to switch

YA[14:0]

PWM mode: Offset trimming after FINEGAIN block

Switch mode: Hysteresis for the output to switch

Both parameters together define the zero Gauss point in PWM mode

In switch mode, XA is used to set the threshold and YA to set the hysteresis

Case YA > 0 Case YA < 0 Output State

ADC < 4.XA – 16.YA ADC < 4.XA Set to Zero

ADC > 4.XA ADC > 4.XA - 16.YA Set to One

Otherwise Otherwise Unchanged

Table 11: Output state as function of XA and YA in switch mode

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 9 of 17 Data Sheet

Rev 001 April 2011

13.5 Clamping level programming (CLAMP)

CLAMP[2:0] defines the clamping level of the PWM output

CLAMP Minimal output

[%DC]

Maximal output

[%DC]

0 1 99

1 4 96

2 5 95

3 6 94

4 7 93

5 8 92

6 9 91

7 10 90

Table 12: CLAMP parameter versus output.

13.6 Bandwidth and filter programming (FILTCODE)

FILTCODE[3:0] allows adjusting the internal bandwidth of the sensor in order to optimize for speed or

resolution.

FILTCODE Cut off frequency [Hz] Attenuation [dB] Tau [ms]

2 557 -8.0 0.29

3 279 -11.2 0.57

4 139 -14.4 1.14

5 70 -18.1 2.29

6 35 -22.4 4.57

7 17 -27.1 9.14

8 9 -32.3 18.29

9 4 -38.1 36.57

Table 13: FILTCODE settings PWM mode

13.7 Current limitation (OUTSLOPE)

2 Bit register to set the current limitation for slew rate control

OUTSLOPE Current limitation [mA]

0 4

1 6

2 11

3 20

Table 14: Current limitation

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 10 of 17 Data Sheet

Rev 001 April 2011

13.8 PWM Mode duty cycle definition (DCDEF)

The PWM duty cycle definition is as follows.

DCDEF PWM duty cycle definition

0 tLow / (tLow + tHigh)

1 tHigh / (tLow + tHigh)

Table 15: PWM duty cycle definition

Figure 2: Two different PWM modes

Figure 3: Power-on behaviour of the two different modes

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 11 of 17 Data Sheet

Rev 001 April 2011

13.9 Sensitivity and temperature drift programming (TC1ST, TC2ND)

TC1ST[6:0]

Programming first order sensitivity temperature drift

Value Typical 1

order TC

0 +2740ppm/°C

63 or 64 0ppm/°C

127 -2950ppm/°C

Table 16: TC1ST parameter

TC2ND[5:0]

Programming second order sensitivity temperature drift

Value Typical 2

order TC

0 or 32 0 ppm/°C²

31 +6.8 ppm/°C²

63 -6.1 ppm/°C²

Table 17: TC2ND parameter

13.10 Offset temperature drift programming (OFFDRIFT)

OFFDRIFT[5:0] parameter defines the offset behaviour over temperature (1

order)

Value Offset drift correction

0 or 32 0 mV/°C

31 +0.9 mV/°C

63 -0.9 mV/°C

Table 18: OFFDRIFT parameter versus correction

13.11 Functional mode (SWITCH)

Value Offset drift correction

0 PWM output mode

1 Switch output mode

Table 19: SWITCH parameter

13.12 Polarity (PLATEPOL)

PLATEPOL parameter changes the sign of the measured sensitivity

Default value = 0

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 12 of 17 Data Sheet

Rev 001 April 2011

13.13 Attenuator (ATTN2P5)

Switch to control the attenuation block in the signal path

Value ATTN2P5

0 Attenuation factor = 1

1 Attenuation factor = 4.5

Table 20: Attenuation settings

13.14 Customer ID (CSTID)

16-bit customer programmable ID

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 13 of 17 Data Sheet

Rev 001 April 2011

14 Recommended Application Diagrams

14.1 Resistor and Capacitor Values

Part Description Value Unit

C1 Decoupling, EMI, ESD 10 nF

C2 Supply capacitor, EMI, ESD 100 nF

Pull up or pull down resistor

4.7

kΩ

Table 21: Resistive and capacitive values for the recommended application diagrams

14.2 Pull down resistor for diagnostic low

Figure 4: Diagnostic low

14.3 Pull up resistor for diagnostic high

Figure 5: Diagnostic high

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 14 of 17 Data Sheet

Rev 001 April 2011

15 Standard information regarding manufacturability of Melexis

products with different soldering processes

Melexis devices are qualified using state-of-the-art practices in accordance with automotive and

environmental requirements.

Through qualifications, various soldering techniques are considered; please refer to “Soldering

recommendations for Melexis products” for more information.

(http://www.melexis.com/Asset/Soldering_Application_Note_and_Recommendations_DownloadLink_5446.as

px).

For components normally soldered using Surface Mounted Device techniques (eg: Reflow process), Melexis

has defined and qualified Moisture Sensitivity Level and Peak Temperature in accordance with the Jedec J-

STD-020 standard. Delivered material is conditioned accordingly. Moisture Sensitivity Level and Peak

Temperature information can be found on the label identifying the material.

In case you intend to use a reflow soldering process for through hole devices (Melexis’ package codes: SA,

UA, VA, VK, VM), please contact Melexis to verify your soldering process compatibility.

The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance of

adhesive strength between device and board.

Based on Melexis commitment to environmental responsibility, Europe legislations (Direction on the

Restriction of the Use of Certain Hazardous substances, RoHS) and customer requests, Melexis has

deployed Pb free leadfinish (typically Matte Tin) on all ASSP products.

For through hole devices (Melexis’ package codes: SA, UA, VA, VK, VM) Trim&Form, please refer to “Trim &

Form recommendations for Melexis products” for more information.

(http://www.melexis.com/Assets/Trim_and_form_recommendations_DownloadLink_5565.aspx)

16 ESD Precautions

Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).

Always observe Electro Static Discharge control procedures whenever handling semiconductor products.

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 15 of 17 Data Sheet

Rev 001 April 2011

17 Package Information

17.1 SOIC8 Package Dimensions

Figure 6: Package dimensions

17.2 SOIC8 Pin Out and Marking

VDD

OUT

TEST1

VSS

TEST4 TEST3

TEST5

TEST2

Figure 7: Pin out and marking

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 16 of 17 Data Sheet

Rev 001 April 2011

17.3 SOIC8 Hall plate positioning

Package center Hall sensor position

0.6mm

Figure 8: Hall Plate positioning

MLX90291

SMD Programmable Linear Hall Sensor IC

Featuring PWM Output

3901090291 Page 17 of 17 Data Sheet

Rev 001 April 2011

18 Disclaimer

Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its

Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the

information set forth herein or regarding the freedom of the described devices from patent infringement.

Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior

to designing this product into a system, it is necessary to check with Melexis for current information. This

product is intended for use in normal commercial applications. Applications requiring extended temperature

range, unusual environmental requirements, or high reliability applications, such as military, medical life-

support or life-sustaining equipment are specifically not recommended without additional processing by

Melexis for each application.

The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be

liable to recipient or any third party for any damages, including but not limited to personal injury, property

damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential

damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical

data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering

of technical or other services.

For the latest version of this document, go to our website at

www.melexis.com

Or for additional information contact Melexis Direct:

Europe, Africa, Asia: America:

Phone: +32 1367 0495 Phone: +1 603 223 2362

E-mail: sales_europe@melexis.com E-mail: sales_usa@melexis.com

ISO/TS 16949 and ISO14001 Certified