US1881KSE - Melexis - Product.Network

US1881

Hall Latch – High Sensitivity

3901001881 Page 1 of 12 Data Sheet

Rev 015 Jan/06

Features and Benefits

 Wide operating voltage range from 3.5V to 24V

 High magnetic sensitivity – Multi-purpose

 CMOS technology

 Chopper-stabilized amplifier stage

 Low current consumption

 Open drain output

 Thin SOT23 3L and flat TO-92 3L

both RoHS Compliant packages

Application Examples

 Automotive, Consumer and Industrial

 Solid-state switch

 Brushless DC motor commutation

 Speed detection

 Linear position detection

 Angular position detection

 Proximity detection

Ordering Information

Part No. Temperature Code Package Code

US1881 E (-40°C to 85°C) SE (TSOT-3L)

US1881 E (-40°C to 85°C) UA (TO-92)

US1881 K (-40°C to 125°C) SE (TSOT-3L)

US1881 K (-40°C to 125°C) UA (TO-92)

US1881 L (-40°C to 150°C) SE (TSOT-3L)

US1881 L (-40°C to 150°C) UA (TO-92)

1 Functional Diagram

2 General Description

The Melexis US1881 is a Hall-effect latch

designed in mixed signal CMOS technology.

The device integrates a voltage regulator, Hall

sensor with dynamic offset cancellation system,

Schmitt trigger and an open-drain output driver, all

in a single package.

Thanks to its wide operating voltage range and

extended choice of temperature range, it is quite

suitable for use in automotive, industrial and

consumer applications.

The device is delivered in a Thin Small Outline

Transistor (TSOT) for surface mount process and

in a Plastic Single In Line (TO-92 flat) for through-

hole mount.

Both 3-lead packages are RoHS compliant.

US1881

Hall Latch – High Sensitivity

3901001881 Page 2 of 12 Data Sheet

Rev 015 Jan/06

Table of Contents

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

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

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

4 Absolute Maximum Ratings........................................................................................... 3

5 Pin Definitions and Descriptions................................................................................... 3

6 General Electrical Specifications .................................................................................. 4

7 Magnetic Specifications ................................................................................................. 4

8 Output Behaviour versus Magnetic Pole ...................................................................... 4

9 Detailed General Description......................................................................................... 5

10 Unique Features............................................................................................................ 5

11 Performance Graphs .................................................................................................... 6

11.1 Magnetic parameters vs. T

.....................................................................................................................6

11.2 Magnetic parameters vs. V

...................................................................................................................6

11.3 V

DSon

vs. T

..............................................................................................................................................6

11.4 V

DSon

vs. V

............................................................................................................................................6

11.5 I

vs. T

..................................................................................................................................................6

11.6 I

vs. V

................................................................................................................................................6

11.7 I

OFF

vs. T

.................................................................................................................................................7

11.8 I

OFF

vs. V

...............................................................................................................................................7

12 Test Conditions............................................................................................................. 7

12.1 Supply Current.........................................................................................................................................7

12.2 Output Saturation Voltage .......................................................................................................................7

12.3 Output Leakage Current ..........................................................................................................................7

12.4 Magnetic Thresholds ...............................................................................................................................7

13 Application Information................................................................................................ 8

13.1 Typical Three-Wire Application Circuit ....................................................................................................8

13.2 Two-Wire Circuit ......................................................................................................................................8

13.3 Automotive and Harsh, Noisy Environments Three-Wire Circuit ............................................................8

14 Application Comments................................................................................................. 8

15 Standard information regarding manufacturability of Melexis products with

different soldering processes........................................................................................... 9

16 ESD Precautions ........................................................................................................... 9

17 Package Information................................................................................................... 10

17.1 SE Package (TSOT-3L).........................................................................................................................10

17.2 UA Package (TO-92 flat) .......................................................................................................................11

18 Disclaimer.................................................................................................................... 12

US1881

Hall Latch – High Sensitivity

3901001881 Page 3 of 12 Data Sheet

Rev 015 Jan/06

3 Glossary of Terms

MilliTesla (mT), Gauss Units of magnetic flux density:

1mT = 10 Gauss

RoHS Restriction of Hazardous Substances

TSOT Thin Small Outline Transistor (TSOT package) – also referred with the Melexis

package code “SE”

ESD Electro-Static Discharge

BLDC Brush-Less Direct-Current

Operating Point (B

) Magnetic flux density applied on the branded side of the package which turns

the output driver ON (V

OUT

= V

DSon

)

Release Point (B

) Magnetic flux density applied on the branded side of the package which turns

the output driver OFF (V

OUT

= high)

4 Absolute Maximum Ratings

Parameter Symbol Value Units

Supply Voltage V

28 V

Supply Current I

50 mA

Output Voltage V

OUT

28 V

Output Current I

OUT

50 mA

Storage Temperature Range T

-50 to 150

Maximum Junction Temperature T

165

Table 1: Absolute maximum ratings

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

rated conditions for extended periods may affect device reliability.

Operating Temperature Range Symbol Value Units

Temperature Suffix “E” T

-40 to 85

Temperature Suffix “K” T

-40 to 125

Temperature Suffix “L” T

-40 to 150

5 Pin Definitions and Descriptions

SE Pin № UA Pin № Name Type Function

1 1 VDD Supply Supply Voltage pin

2 3 OUT Output Open Drain Output pin

3 2 GND Ground Ground pin

Table 2: Pin definitions and descriptions

SE package

UA package

US1881

Hall Latch – High Sensitivity

3901001881 Page 4 of 12 Data Sheet

Rev 015 Jan/06

6 General Electrical Specifications

DC Operating Parameters T

= 25

C, V

= 3.5V to 24V (unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Units

Supply Voltage V

Operating 3.5 24 V

Supply Current I

B < B

5 mA

Output Saturation Voltage V

DSon

OUT

= 20mA, B > B

0.5 V

Output Leakage Current I

OFF

B < B

RP,

OUT

= 24V 0.3 10 µA

Output Rise Time t

= 1kΩ, C

= 20pF 0.25 µs

Output Fall Time t

= 1kΩ, C

= 20pF 0.25 µs

Maximum Switching Frequency F

10 KHz

Package Thermal Resistance R

Single layer (1S) Jedec board 301 °C/W

Table 3: Electrical specifications

7 Magnetic Specifications

DC Operating Parameters V

= 3.5V to 24V (unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Units

Operating Point B

0.5 9.5 mT

Release Point B

-9.5 -0.5 mT

Hysteresis B

HYST

E spec., T

= 85°C

7 12 mT

Operating Point B

0.5 9.5 mT

Release Point B

-9.5 -0.5 mT

Hysteresis B

HYST

K spec., T

= 125°C

7 12 mT

Operating Point B

0.5 9.5 mT

Release Point B

-9.5 -0.5 mT

Hysteresis B

HYST

L spec., T

= 150°C

6 12.5 mT

Table 4: Magnetic specifications

Note 1: For typical values, please refer to the performance graphs in section 11

8 Output Behaviour versus Magnetic Pole

DC Operating Parameters T

= -40

C to 150

C, V

= 3.5V to 24V (unless otherwise specified)

Parameter Test Conditions (SE) OUT (SE)

Test Conditions (UA) OUT (UA)

South pole B < B

High B > B

Low

North pole B > B

Low B < B

High

Table 5: Output behaviour versus magnetic pole

South pole

OUT = high

North pole

OUT = low (V

DSon

)

North pole

OUT = high

South pole

OUT = low (V

DSon

)

SE package UA package

US1881

Hall Latch – High Sensitivity

3901001881 Page 5 of 12 Data Sheet

Rev 015 Jan/06

9 Detailed General Description

Based on mixed signal CMOS technology, Melexis US1881 is a Hall-effect device with high magnetic

sensitivity. This multi-purpose latch suits most of the application requirements.

The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed

with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and

contributes to smaller chip size and lower current consumption than bipolar technology. The small chip size is

also an important factor to minimize the effect of physical stress.

This combination results in more stable magnetic characteristics and enables faster and more precise design.

The wide operating voltage from 3.5V to 24V, low current consumption and large choice of operating

temperature range according to “L”, “K” and “E” specification make this device suitable for automotive,

industrial and consumer applications.

The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using

a pull-up resistor tied between a pull-up voltage and the device output.

10 Unique Features

The US1881 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north

poles to operate properly.

SE package - Latch characteristic

UA package - Latch characteristic

The device behaves as a latch with symmetric operating and release switching points (B

=|B

|). This

means magnetic fields with equivalent strength and opposite direction drive the output high and low.

Removing the magnetic field (B→0) keeps the output in its previous state. This latching property defines the

device as a magnetic memory.

A magnetic hysteresis B

HYST

keeps B

and B

separated by a minimal value. This hysteresis prevents

output oscillation near the switching point.

US1881

Hall Latch – High Sensitivity

3901001881 Page 6 of 12 Data Sheet

Rev 015 Jan/06

11 Performance Graphs

11.1 Magnetic parameters vs. T

-9

-6

-3

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

Ta (°C)

Magnetic field (mT)

Bop, VDD=3.5V Bop, VDD=24V

Brp, VDD=3.5V Brp, VDD=24V

Bhyst, VDD=3.5V Bhyst, VDD=24V

11.2 Magnetic parameters vs. V

-9

-6

-3

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

VDD (Volts)

Magnetic field (mT)

Bop, Ta=25°C Bop, Ta=150°C

Brp, Ta=25°C Brp, Ta=150°C

Bhyst, Ta=25°C Bhyst, Ta=150°C

11.3 V

DSon

vs. T

0.2

0.4

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

Ta (°C)

VDSon (Volts)

VDD = 3.5V

VDD = 12V

VDD = 24V

11.4 V

DSon

vs. V

0.1

0.2

0.3

0.4

0.5

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

VDD (Volts)

VDSon (Volts)

Ta = -40°C

Ta = 25°C

Ta = 85°C

Ta = 150°C

11.5 I

vs. T

0.5

1.5

2.5

3.5

4.5

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

Ta (°C)

IDD (mA)

VDD = 3.5V

VDD = 12V

VDD = 24V

11.6 I

vs. V

0.5

1.5

2.5

3.5

4.5

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

VDD (Volts)

IDD (mA)

Ta = -40°C

Ta = 25°C

Ta = 85°C

Ta = 150°C

US1881

Hall Latch – High Sensitivity

3901001881 Page 7 of 12 Data Sheet

Rev 015 Jan/06

11.7 I

OFF

vs. T

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150

Ta (°C)

Ioff (µA)

VDD = 3.5V

VDD = 12V

VDD = 24V

11.8 I

OFF

vs. V

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

VDD (Volts)

Ioff (µA)

Ta = 25°C

Ta = 85°C

Ta = 150°C

12 Test Conditions

Note : DUT = Device Under Test

12.1 Supply Current

12.2 Output Saturation Voltage

12.3 Output Leakage Current

12.4 Magnetic Thresholds

US1881

Hall Latch – High Sensitivity

3901001881 Page 8 of 12 Data Sheet

Rev 015 Jan/06

13 Application Information

14 Application Comments

For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between

the V

and ground pin.

For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the V

pin.

When using a resistor, three points are important:

- the resistor has to limit the reverse current to 50mA maximum (V

/ R1 ≤ 50mA)

- the resulting device supply voltage V

has to be higher than V

min (V

= V

– R1.I

)

- the resistor has to withstand the power dissipated in reverse voltage condition (P

= V

/ R1)

When using a diode, a reverse current cannot flow and the voltage drop is almost constant (≈0.7V).

Therefore, a 100Ω/0.25W resistor for 5V application and a diode for higher supply voltage are recommended.

Both solutions provide the required reverse voltage protection.

When a weak power supply is used or when the device is intended to be used in noisy environment, it is

recommended that figure 13.3 from the Application Information section is used.

The low-pass filter formed by R1 and C1 and the zener diode Z1 bypass the disturbances or voltage spikes

occurring on the device supply voltage V

. The diode D1 provides additional reverse voltage protection.

13.1 Typical Three-Wire Application Circuit

13.3 Automotive and Harsh, Noisy Environments

Three-Wire Circuit

13.2 Two-Wire Circuit

Note:

With this circuit, precise ON and OFF

currents can be detected using only two

connecting wires.

The resistors RL and Rb can be used to

bias the input current. Refer to the part

specifications for limiting values.

: I

OFF

= I

+ I

= V

+ I

: I

= I

OFF

+ I

OUT

= I

OFF

+ V

US1881

Hall Latch – High Sensitivity

3901001881 Page 9 of 12 Data Sheet

Rev 015 Jan/06

15 Standard information regarding manufacturability of Melexis

products with different soldering processes

Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity

level according to following test methods:

Reflow Soldering SMD’s (Surface Mount Devices)

• IPC/JEDEC J-STD-020

Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices

(classification reflow profiles according to table 5-2)

• EIA/JEDEC JESD22-A113

Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing

(reflow profiles according to table 2)

Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)

• EN60749-20

Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat

• EIA/JEDEC JESD22-B106 and EN60749-15

Resistance to soldering temperature for through-hole mounted devices

Iron Soldering THD’s (Through Hole Devices)

• EN60749-15

Resistance to soldering temperature for through-hole mounted devices

Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)

• EIA/JEDEC JESD22-B102 and EN60749-21

Solderability

For all soldering technologies deviating from above mentioned standard conditions (regarding peak

temperature, temperature gradient, temperature profile etc) additional classification and qualification tests

have to be agreed upon with Melexis.

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

adhesive strength between device and board.

Melexis is contributing to global environmental conservation by promoting lead free solutions. For more

information on qualifications of RoHS compliant products (RoHS = European directive on the Restriction Of

the use of certain Hazardous Substances) please visit the quality page on our website:

http://www.melexis.com/quality.asp

16 ESD Precautions

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

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

US1881

Hall Latch – High Sensitivity

3901001881 Page 10 of 12 Data Sheet

Rev 015 Jan/06

17 Package Information

17.1 SE Package (TSOT-3L)

1.90 BSC

2.90 BSC

0.30

0.45

0.95 BSC

0.127+0.023

- 0.007

0.15

0.20

see note 3

0.20

0.891+/-0.05

US1881

Hall Latch – High Sensitivity

3901001881 Page 11 of 12 Data Sheet

Rev 015 Jan/06

17.2 UA Package (TO-92 flat)

3.00+/-0.20

1.65+/-0.10

14.5+/-0.5

2.5 min

see note 4

US1881

Hall Latch – High Sensitivity

3901001881 Page 12 of 12 Data Sheet

Rev 015 Jan/06

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

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