BCDSEMI AH922

Preliminary Datasheet
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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The AH922 Hall-effect switch is combined with a
voltage regulator, Hall-voltage generator, chopper
small-signal amplifier, Schmitt trigger and
open-drain output.
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
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The AH922 is available in TO-92S-3 and SOT-23-3
packages.
TO-92S-3
5V/12V DC Brushless Motor/Fan
Solid State Switch
Speed Detection
Revolution Counting
SOT-23-3
Figure 1. Package Types of AH922
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
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
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
AH922
UNIPOLAR HALL-EFFECT SWITCH
Functional Block Diagram
Figure 3. Functional Block Diagram of AH922
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
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.
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
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 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
VCC
3.5
22
V
Operating Ambient Temperature
TA
-40
125
ºC
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
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, B<BRP
3
5
mA
VCC=12V, B>BOP
3
5
mA
Operating
VSAT
IOUT=20mA, B>BOP
185
500
mV
ILEAKAGE
VOUT=20V, B<BRP
0.1
5
µA
Output Rising Time
tRISING
RL=1kΩ,CL=20pF
0.4
2
µs
Output Falling Time
tFALLING
RL=1kΩ,CL=20pF
0.4
2
µs
Output Leakage Current
Magnetic Characteristics
VCC =12V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Min
Typ
Max
Unit
Operating point
BOP
80
110
140
Gauss
Releasing point
BRP
35
65
95
Gauss
Hysteresis
BHYS
20
45
70
Gauss
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
AH922
UNIPOLAR HALL-EFFECT SWITCH
Magnetic Characteristics (Continued)
Figure 4. Magnetic Flux Density of AH922
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
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<BRP.
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
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<BRP.
Note 7: VDC=12V.
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
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. TA
160
80
60
VCC=12V
VCC=24V
IOUT=20mA
140
120
40
100
20
80
5
10
15
20
-25
25
0
25
50
75
100
125
o
IOUT (mA)
TA ( C)
Figure 11. VSAT vs. IOUT
Nov. 2011
75
TA ( C)
Figure 9. ICC vs. VCC
0
0
50
o
VCC (V)
Figure 12. VSAT vs. TA
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
10
Preliminary Datasheet
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. TA
450
400
SOT-23-3
TO-92S-3
350
PD (mW)
300
250
200
150
100
50
0
0
25
50
75
100
125
150
o
TA ( C)
Figure 15. PD vs. TA
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
Preliminary Datasheet
AH922
UNIPOLAR HALL-EFFECT SWITCH
Typical Application
Output
RL
VCC
CL
0.1 F
Figure 16. Typical Application Circuit of AH922
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
12
Preliminary Datasheet
UNIPOLAR HALL-EFFECT SWITCH
AH922
Mechanical Dimensions
TO-92S-3
Unit: mm(inch)
°
°
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
13
Preliminary Datasheet
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. 300(0. 051)
Nov. 2011
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
14
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