Datasheet US5781E, US5781L Datasheet (MELEXIS)

US5781

CMOS High Sensitivity Switch

Preliminary Datasheet

Features and Benefits

• Chopper stabilized amplifier stage

• New miniature package / thin, high reliability package

• Operation down to 3.5V

• CMOS for optimum stability, quality, and cost

Applications

• Solid state switch

• Limit switch

• Current limit

• Interrupter

Ordering Information

Part No. Temperature Suffix Package Temperature Range

US5781 E SO or UA -40°C to 85°C Extended US5781 L SO or UA -40°C to 150°C Automotive

Preliminary

Functional Diagram

SO Package Pin 1 - V

DD

Pin 2 - Output Pin 3 - GND

Output

V

DD

Voltage

Regulator

Chopper

GND

UA Package

Pin 1 - V

DD

Pin 2 - GND Pin 3 - Output

Note: This is a static-sensitive device; please observe ESD precautions. Reverse VDD protection is not included. For reverse voltage protection, a 100Ω resistor in series with VDD is recommended.

Description

The US5781 is a unipolar Hall effect sensor IC fabricated from mixed signal CMOS technology. It incorporates advanced chopper stabilization techniques to provide accurate and stable magnetic switch points. There are many applications for this sensor in addition to those listed above. The design, specifications and performance have been optimized for applications of solid state switches.

The output transistor will be switched on (BOP) in the presence of a sufficiently strong South pole magnetic field facing the marked side of the package. Similarly, the output will be switched off (BRP) in the presence of a weaker South field and remain off with “0” field. The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be switched on (BOP) in the presence of a sufficiently strong North pole magnetic field subjected to the marked face.

US5781 CMOS High Sensitivity Switch 3901005781 Rev 1.7 7/23/01 Page 1

US5781

CMOS High Sensitivity Switch

Preliminary Datasheet

US5781 Electrical Specifications

DC operating parameters: TA = -40 to 150oC, VDD = 12VDC (unless otherwise specified).

Parameter Symbol Test Conditions Min Typ Max Units

Supply Voltage VDD Operating 3.5 24 V Supply Current IDD B<BRP 0.5 2.5 5.0 mA

Saturation Voltage V Output Leakage I Output Rise Time tr VDD = 12V, RL = 1.1KÙ, CL = 20pf 0.04 ì s Output Fall Time tf VDD = 12V, RL = 1.1KÙ, CL = 20pf 0.18 ì s

I

DS(on)

B<BRP, V

OFF

OUT

= 20 mA, B>BOP 0.3 0.5 V

= 27V 0.01 5.0 ì A

OUT

US5781 Magnetic Specifications

Magnetic operating parameters: TA = -40 to 150oC, VDD =12 VDC (unless otherwise specified).

Parameter Symbol Test Conditions Min Typ Max Units

Operating Point BOP 7.0 12.0 15.0 mT Release Point BRP 3.5 7.0 10.0 mT

Hysteresis B

Note: 1 mT = 10 Gauss.

2.0 5.0 7.0 mT

hys

Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis does not assume any liability arising from the use of any product or application of any product or circuit described herein.

US5781 CMOS High Sensitivity Switch 3901005781 Rev 1.7 7/23/01 Page 2

Flux Density mV/mT

Performance Graphs

US5781

CMOS High Sensitivity Switch

Preliminary Datasheet

Typical Magnetic Switch Points versus Supply Voltage

14.0

12.0

B

OP

10.0

8.0

Flux Density (mT)

6.0

4.0 1050 20 25 30

Supply Voltage (V)

B

RP

15

5781

Typical Magnetic Switch Points

versus Temperature

14

12

BOP

9

BRP

Flux Density (mT)

6

B

HyS

3

0

Temperature (ºC)

5781

150 40 0 -40 80 120

Min/Max Magnetic Switch

Range Versus Temperature

16

14

12

10

8

6

4

2

0

-40 -20 0 20 40 60 80 100 120 140

5781

B

OP Max

B

RP Max

B

OP Min

B

RP Min

Temperature C°

US5781 CMOS High Sensitivity Switch 3901005781 Rev 1.7 7/23/01 Page 3

versus Flux Density

30

V

24

18

12

Output Voltage (V)

6

0

DD

Flux Density (mT)

B

OP

B

RP

V

out

10

0-10-20 20 30

5781

40

Output Voltage

Performance Graphs

US5781

CMOS High Sensitivity Switch

Preliminary Datasheet

Typical Supply Current versus Supply Voltage

5

4

TA = -40oC

3

TA = 25oC

2

Supply Current (mA)

1

0

TA = 125oC

1050 20 25 30

Supply Voltage (V)

Typical Saturation Voltage versus Temperature

VDD = 12 V, I

5781

15

500

400

300

(mV)

DS(ON)

200

V

100

0

0-40 120 160 20040

Temperature (oC)

= 20mA

OUT

V

DS(ON)

80

5781

Power Dissipation versus

Wave Soldering Parameters

Temperature

500

400

300

200

All Devices

UA Package

R

=206oC/W

θ

JA

280

260

C)

o

240

220

Solder Temperature (

100

Package Power Dissipation (mW)

SO Package

R

=575oC/W

θJA

0

0-40 120 160 20040

80

Temperature (oC)

200

1050 20 25 30

Time in Wave Solder (Seconds)

US5781 CMOS High Sensitivity Switch 3901005781 Rev 1.7 7/23/01 Page 4

All Devices

15

Unique Features

CMOS Hall IC Technology

The chopper stabilized amplifier uses switched capacitor techniques to eliminate the amplifier offset voltage, which, in bipolar devices, is a major source of temperature sensitive drift. CMOS makes this advanced technique possible. The CMOS chip is also much smaller than a bipolar chip, allowing very sophisticated circuitry to be placed in less space. The small chip size also contributes to lower physical stress and less power consumption.

Installation Comments

Consider temperature coefficients of Hall IC and magnetics, as well as air gap life time variations. Observe temperature limits during wave soldering.

Applications

If reverse supply protection is desired, use a resistor in series with the VDD pin. The resistor will limit the supply current (Fault), IDD, to 50 mA. For severe EMC conditions, use the application circuit on this page.

CMOS High Sensitivity Switch

Preliminary Datasheet

Automotive and Severe Environment Protection Circuit

R1 100

Ω

D1

Supply

Voltage

Z1

C1

4.7nF

US5781

V

DD

R

L

1.2K

Hall IC

OUT

C2

4.7nF

V

SS

Two Wire Current Biasing Circuit

R

Iout

L

Hall

IC

Absolute Maximum Ratings

I

IN

V

DD

I

R

b

Supply Voltage (Operating), VDD 3.5V to 24V Supply Current (Fault), IDD 50mA Output Voltage, V Output Current (Fault), I Power Dissipation, PD 100mW Operating Temperature Range, TA -40 to 150°C

3.5V to 24V

OUT

50mA

OUT

The resistors Rb and RL can be used to bias the input current, Iin. Refer to the part specification for limiting values. This circuit will help in getting the precise ON and OFF currents desired.

BRP = Ioff = (VDD / Rb + I

BOP = Ion = (Ioff + VDD / RL )

)

DD

Storage Temperature Range, TS -65 to 150°C Maximum Junction Temp, TJ 175°C ESD Sensitivity (All Pins) +/- 2KV

US5781 CMOS High Sensitivity Switch 3901005781 Rev 1.7 7/23/01 Page 5

Physical Characteristics

US5781

CMOS High Sensitivity Switch

Preliminary Datasheet

1.60

1.40

0.84

0.63

0.20

0.00

0.48

0.43

0.41

0.35

1 2 3

1.30

1.24

4.30

3.90

2.64

2.34

U57

115

UA Package Dimensions

o

45

Typical

*

3.20

2.80

1.75

1.55

NOTES:

1.) Controlling dimension: mm

2.) Leads must be free of flash and plating voids

3.) Do not bend leads within 1mm of lead to package interface.

4.) Package dimensions exclude molding flash

5.) Tolerance is 0.254mm unless otherwise specified

2.57

2.51

0.41

0.35

5

Typical

o

Typical

0.38

Typical

(see note 3)

UA Hall Plate / Chip Location

2.13

1.87

1.53

1.27

o

45

Marked

Surface

All Dimensions in millimeters

* MARKING: Line 1: 1st digit (U) = Supplier (Melexis)

15.5

14.5

2nd and 3rd digits (57) = Series (5780) Line 2:

1st digit (1) = Year (2001) 2nd and 3rd digits(15) = Week of Year

PINOUT: Pin 1 V Pin 2 GND Pin 3 Output

DD

0.45

0.41

SOT-23 Hall Plate / Chip LocationSOT-23 Package Dimensions

3.00

2.60

0.50

0.35

57104

1.70

3.10

2.70

* MARKING: 1st & 2nd Digit (57) = Series (5780)

0.20 MIN

3rd Digit(1) = Year - 2001 Last Digits (04) = Week of Year

*

1.80

0.10

0.00

1.50

0.90

0.70

1.30

1.00

chip

0.66

0.56

NOTES:

1.) Controlling dimension: mm

2.) Lead thickness after solder plating will be 0.254 mm maximum

0.25

3.) Package dimensions exclude molding

0.102.10

flash

4.) The end flash shall not exceed 0.127mm on each side of package

5.) Tolerance is 0.254mm unless otherwise specified

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

WWW.melexis.com

Or for additional information Contact Melexis Direct: Europe and Japan USA and rest of the world E-mail: [email protected] E-mail: [email protected] Phone: 011-32-13-670-780 Phone: (603)-223-2362

Bottom View of Package

3

2 1

1.55

1.45

PINOUT: Pin 1 V Pin 2 Output Pin 3 GND

DD

0.95

0.85

US5781 CMOS High Sensitivity Switch 3901005781 Rev 1.7 7/23/01 Page 6