Diodes AH922 User Manual

UNIPOLAR HALL-EFF E CT SWITCH

Data Sheet

AH922

General Description

The AH922 is a unipolar Hall-effect one-chip switch
with digital output, solution for sense magnetic field.
It is designed in mixed signal CMOS and chopper
technology. This IC is quite suitable for use in
automotive, industrial and consumer applications.

The two sensors are suited for operation over
extended temperature ranges.

The AH922 Hall-effect switch is combined with a
voltage regulator, Hall-voltage generator, chopper
small-signal amplifier, Schmitt trigger and
open-drain output.

The AH922 is available in TO-92S-3 and SOT-23-3
packages.

Features

• Wide Operating Voltage Range

• Chopper Stabilization

• Extremely Low Switch Point Drift

• Superior T emperature Stability

• High Sensitivity Integrated Hall Sensor

• Solid State Reliability

• Robust EMC Capability

Applications

• 5V/12V DC Brushless Motor/Fan

• Solid State Switch

• Speed Detection

• Revolution Counting

TO-92S-3 SOT-23-3

Figure 1. Package Types of AH922

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Pin Configuration

Z3 Package N Package

(TO-92S-3) (SOT-23-3)

3

2

1

(Front View) (Top View)

Figure 2. Pin Configuration of AH922

3

21

Pin Description

Pin Number

TO-92S-3 SOT-23-3

1 1 VCC Supply voltage
2 3 GND Ground pin
3 2 OUT Output pin

Pin Name Function

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Functional Block Diagram

Figure 3. Functional Block Diagram of AH922

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Ordering Information

AH922 -

Circuit Type

Package
Z3: TO-92S-3
N: SOT-23-3

Package

TO-92S-3 AH922Z3-G1 922 Bulk

SOT-23-3

Temperature

Range

-40 to 125°C

Part Number Marking ID Packing Type

AH922NTR-G1 GT4 Tape & Reel

G1: Green

TR: Tape & Reel
Blank: Bulk

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
compliant and green.

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Voltage VCC 24 V
Output Current (Continuous) I

Power Dissipation

Operation T em perature TA -50 to 150 ºC
Storage Temperature T
Maximum Junction Temperature TJ (Max) 165 ºC
ESD (Human Body Model) ESD 4000 V

25 mA

OUT

P

D

-65 to 150 ºC

STG

TO-92S-3 400
SOT-23-3 230

mW

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Voltage V
Operating Ambient Temperature TA -40 125 ºC

CC

3.5 22 V

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Electrical Characteristics

V

=12V, TA=25°C, unless otherwise specified.

CC

Parameter Symbol Conditions Min Typ Max Unit

Supply Voltage VCC Operating 3.5 12 22 V

VCC=12V, B<BRP 3 5 mA

Supply Current ICC

V

=12V, B>BOP 3 5 mA

CC

Saturation Voltage V
Output Leakage Current I
Output Rising Time t
Output Falling Time t

I

SAT

LEAKAGE

RISING

FALLING

OUT

V

OUT

=1kΩ,CL=20pF

R

L

=1kΩ,CL=20pF

R

L

=20mA, B>B

=20V, B<BRP 0.1 5

OP

185 500 mV

0.4 2

0.4 2

µA

µs
µs

Magnetic Characteristics

V

=12V, TA=25°C, unless otherwise specified.

CC

Parameter Symbol Min Typ Max Unit

Operating point BOP 80 110 140 Gauss
Releasing point BRP 35 65 95 Gauss
Hysteresis B

20 45 70 Gauss

HYS

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Magnetic Characteristics (Continued)

Figure 4. Magnetic Flux Density of AH922

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Test Circuit and Test Conditions

Figure 5. Test Circuit of AH922

Figure 6. Test Condition of AH922 (Supply Current)

Note 2: The output is open during measurement.
Note 3: The device is put under the magnetic field: B<B

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

RP.

8

Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Test Circuit and Test Conditions (Continued)

Figure 7. Test Condition of AH922 (Output Saturation Voltage)

Note 4: The output saturatio n volt a ge V
Note 5: The device is put under the magnetic field: B>B

is measured at VCC=12V.

SAT

OP.

Figure 8. Test Condition of AH922 (Output Leakage Current)

Note 6: The device is put under the magnetic field: B<B

RP.

Note 7: VDC=12V.

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Typical Performance Characteristics

4.0

3.5

3.0

(mA)

CC

I

2.5

2.0

1.5
2 4 6 8 1012141618202224262830

VCC (V)

Figure 9. I

vs. VCC Figure 10. ICC vs. TA

CC

4.5

4.0

3.5

3.0

(mA)

2.5

CC

I

2.0

VCC=3.5V
VCC=5V

1.5

VCC=12V
VCC=24V

1.0

-25 0 25 50 75 100 125

TA (oC)

160

140

120

100

80

(mV)

SAT

V

60

40

20

0

0 5 10 15 20 25

I

(mA)

OUT

220

200

180

160

(mV)

140

SAT

V

120

100

80

VCC=3.5V
VCC=5V
VCC=12V
VCC=24V

I

=20mA

OUT

-25 0 25 50 75 100 125

TA (oC)

Figure 11. V

SAT

vs. I

OUT

Figure 12. V

SAT

vs. T

A

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Typical Performance Characteristics (Continued)

150
140
130
120
110
100

(Gauss)

90

HYS

/B

80

RP

/B

70

OP

B

60
50
40
30

2 4 6 8 10 12 14 16 18 20 22 24 26

VCC (V)

B

OP

B

RP

B

HYS

150
140
130
120
110
100

(Gauss)

90

HYS

80

/B

RP

70

/B

OP

60

B

50
40
30
20

-50 -25 0 25 50 75 100 125 150

Figure 13. BOP/ BRP/ B

HYS

vs. V

CC

Figure 14. BOP/ BRP/ B

450

400

350

300

250

(mW)

D

200

P

150

100

50

0

0 25 50 75 100 125 150

TA (oC)

SOT-23-3
TO-92S-3

Figure 15. PD vs. TA

TA (oC)

HYS

vs. TA

B

OP

B

RP

B

HYS

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

T ypical Application

C

Figure 16. Typical Application Circuit of AH922

0.1 F

L

R

Output

L

V

CC

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Mechanical Dimensions

TO-92S-3 Unit: mm(inch)

°
°

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

UNIPOLAR HALL-EFF E CT SWITCH

AH922

Mechanical Dimensions (Continued)

SOT-23-3 Unit: mm(inch)

2.820(0.111)

3.020(0.119)

1.300(0.051)

1.600(0.063)

0.300(0.012)

Package Sensor

Location

2.650(0.104)

2.950(0.116)

1.500(0.059)

1.700(0.067)

0.200(0.008)

0.600(0.024)

0.100(0.004)

0.200(0.008)

0.950(0.037)
TYP

MAX.

1.450(0.057)

1.800(0.071 )

2.000(0.079)

0.770(0.030)

1.070(0.042)

0.300(0.012

0.500(0.020)

0.900(0.035)

1.300(0.051)

)

0.000(0.000)

0.150(0.006)

0
8

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited

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particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

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