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Data Sheet

UNIPOLAR HALL-EFFECT SWITCH

AH922

May 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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 Temperature 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

Figure 1. Package Types of AH922

TO-92S-3 SOT-23-3

Summary of content (15 pages)

PAGE 1
Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH General Description Features 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.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Pin Configuration Z3 Package (TO-92S-3) N Package (SOT-23-3) 3 3 2 1 2 1 (Front View) (Top View) Figure 2. Pin Configuration of AH922 Pin Description Pin Number TO-92S-3 SOT-23-3 Pin Name Function 1 1 VCC Supply voltage 2 3 GND Ground pin 3 2 OUT Output pin May 2012 Rev. 1.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Functional Block Diagram Figure 3. Functional Block Diagram of AH922 May 2012 Rev. 1.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Ordering Information AH922 - G1: Green Circuit Type TR: Tape & Reel Blank: Bulk Package Z3: TO-92S-3 N: SOT-23-3 Package Temperature Range TO-92S-3 Part Number Marking ID Packing Type AH922Z3-G1 922 Bulk AH922NTR-G1 GT4 Tape & Reel -40 to 125°C SOT-23-3 BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. May 2012 Rev. 1.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Supply Voltage VCC 24 V Output Current (Continuous) IOUT 25 mA Power Dissipation Operation Temperature Storage Temperature Maximum Junction Temperature ESD (Human Body Model) TO-92S-3 400 SOT-23-3 230 PD mW TA -50 to 150 ºC TSTG -65 to 150 ºC TJ (Max) 165 ºC ESD 4000 V Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage
PAGE 6
Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Electrical Characteristics VCC =12V, TA=25°C, unless otherwise specified. Parameter Symbol Supply Voltage VCC Supply Current ICC Saturation Voltage Conditions Min Typ Max Unit 3.5 12 22 V VCC=12V, BBOP 3 5 mA Operating VSAT IOUT=20mA, B>BOP 185 500 mV ILEAKAGE VOUT=20V, B
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Magnetic Characteristics (Continued) Figure 4. Magnetic Flux Density of AH922 May 2012 Rev. 1.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH 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
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Test Circuit and Test Conditions (Continued) Figure 7. Test Condition of AH922 (Output Saturation Voltage) Note 4: The output saturation voltage VSAT is measured at VCC=12V. Note 5: The device is put under the magnetic field: B>BOP. Figure 8. Test Condition of AH922 (Output Leakage Current) Note 6: The device is put under the magnetic field: B
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Typical Performance Characteristics 4.0 4.5 4.0 3.5 ICC (mA) ICC (mA) 3.5 3.0 2.5 3.0 2.5 2.0 2.0 VCC=3.5V VCC=5V 1.5 VCC=12V VCC=24V 1.0 1.5 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 -25 0 25 220 140 200 120 180 125 100 160 VCC=3.5V VCC=5V VSAT (mV) VSAT (mV) 100 Figure 10. ICC vs.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Typical Performance Characteristics (Continued) 150 150 140 BOP 130 BRP BHYS 100 90 80 70 100 90 80 70 60 50 50 40 40 30 20 -50 30 6 8 10 12 14 16 18 20 22 24 26 BHYS 110 60 4 BRP 120 110 2 BOP 130 BOP/BRP/BHYS (Gauss) BOP/BRP/BHYS (Gauss) 120 140 -25 0 25 50 75 100 125 150 o VCC (V) TA ( C) Figure 13. BOP/ BRP/ BHYS vs. VCC Figure 14. BOP/ BRP/ BHYS vs.
PAGE 12
Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Typical Application Output RL VCC CL 0.1 F Figure 16. Typical Application Circuit of AH922 May 2012 Rev. 1.
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Data Sheet UNIPOLAR HALL-EFFECT SWITCH AH922 Mechanical Dimensions TO-92S-3 Unit: mm(inch) ° ° May 2012 Rev. 1.
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Data Sheet AH922 UNIPOLAR HALL-EFFECT SWITCH Mechanical Dimensions (Continued) SOT-23-3 Unit: mm(inch) 2. 820(0. 111) 3. 020(0. 119) 0. 100(0. 004) 0. 200(0. 008) 0.300(0.012) 0.600(0.024) 1.500(0.059) 1.700(0.067) 2.650(0.104) 2.950(0.116) 1. 300(0. 051) 1. 600(0. 063) Package Sensor Location 0. 200(0. 008) 0. 770(0. 030) 1. 070(0. 042) 1. 800(0. 071) 2. 000(0. 079) 0 8 0. 300(0. 012) 0. 500(0. 020) 1.450(0.057) MAX. 0. 950(0. 037) TYP 0. 000(0. 000) 0. 150(0. 006) 0. 900(0. 035) 1.
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BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein.