BCDSEMI AH921NTR-G1

Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
General Description
Features
The AH921 is a Hall-effect latch designed in mixed
signal CMOS technology. It is quite suitable for use
in automotive, industrial and consumer applications.
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Superior high-temperature performance is made
possible through dynamic offset cancellation, which
reduces the residual offset voltage normally caused
by device over-molding, temperature dependencies,
and thermal stress. The device integrates a voltage
regulator, Hall-voltage generator, small-signal
amplifier, chopper stabilization, schmitt trigger, and
is directly drivable by the output.
AH921
Wide Operating Voltage Range from 3.5 to 24V
Symmetrical Switch Points
Chopper-stabilized Amplifier Stage
Superior Temperature Stability
Compact Size
Built-in Pull-up Resistor
ESD Rating: 3500V (Human Body Model)
Applications
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An on-board regulator permits operation with supply
voltage from 3.5V to 24V.
The AH921 is available in TO-92S-3 and SOT-23-3
packages, which are optimized for most applications.
TO-92S-3
Brushless DC Motor Commutation
Brushless DC Fan
Solid-state Switch
Revolution Counting
Speed Detection
High Sensitivity and Unconnected Switch
SOT-23-3
Figure 1. Package Types of AH921
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
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 AH921
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
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Functional Block Diagram
VCC
OUT
1 (1)
3 (2)
100k
Reference Voltage
Hall Sense
Chopper
Switch
AMP
2 (3)
GND
A (B)
A for TO-92S-3
B for SOT-23-3
Figure 3. Functional Block Diagram of AH921
Ordering Information
AH921
Package
TO-92S-3
SOT-23-3
-
Circuit Type
G1: Green
Package
Z3: TO-92S-3
N: SOT-23-3
TR: Tape & Reel
Blank: Bulk
Temperature
Range
-40 to 125°C
Part Number
Marking ID
Packing Type
AH921Z3-G1
921
Bulk
AH921NTR-G1
GS6
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
compliant and green.
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Supply Voltage
VCC
28
V
Supply Current (Fault)
ICC
5
mA
Output current (Continuous)
IOUT
25
mA
TO-92S-3
400
SOT-23-3
230
Power Dissipation
PD
Operating Temperature
TA
-50 to 150
ºC
TSTG
-65 to 150
ºC
TJ (Max)
165
ºC
ESD
3500
V
Storage Temperature
Maximum Junction Temperature
ESD (Human Body Model)
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
VCC
3.5
24
V
Operating Temperature
TA
-40
125
ºC
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Electrical Characteristics
VCC =12V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Supply Voltage
VCC
Supply Current
ICC
Saturation Voltage
Output Leakage Current
VSAT
ILEAKAGE
Conditions
Min
Typ
Max
Unit
3.5
12
24
V
VCC=12V, B<BRP
3.0
5.0
mA
VCC=12V, B>BOP
3.0
5.0
mA
IOUT=20mA, B>BOP
185
500
mV
VCC=VOUT=24V, B<BRP
0.1
10
µA
Operating
Output Rising Time
tRISING
CL=20pF
0.4
2
µs
Output Falling Time
tFALLING
CL=20pF
0.4
2
µs
Magnetic Characteristics
VCC =12V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Min
Typ
Max
Unit
Operating Point
BOP
5
22
40
Gauss
Releasing Point
BRP
-40
-22
-5
Gauss
Hysteresis
BHYS
45
Gauss
Figure 4. Magnetic Flux Density of AH921
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Magnetic Characteristics (Continued)
South Pole
North Pole
Output=Low (For TO-92S-3)
Output=High (For TO-92S-3)
Figure 5. Output Status vs. Magnetic Pole
Package Type
TO-92S-3
SOT-23-3
Parameter
Test condition
Output
South Pole
North Pole
South Pole
North Pole
B>BOP
B<BRP
B>BOP
B<BRP
Low
High
High
Low
Table 1. Output Status vs. Magnetic Pole
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Magnetic Characteristics (Continued)
Figure 6. Magnetic Thresholds
Note 2: BOP is determined by putting the device under magnetic field swept from BRP(Min) to BOP(Max) until the
output is switched on.
Note 3: BRP is determined by putting the device under magnetic field swept from BOP(Max) to BRP(Min) until the
output is switched off.
Test Circuit and Test Conditions
Figure 7. Test Circuit of AH921
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Test Circuit and Test Conditions (Continued)
Figure 8. Test Condition of AH921 (Supply Current)
Note 4: Output initial status is low when powering on.
Note 5: The supply current ICC represents the average supply current. The output is open during measurement.
Note 6: The device is put under the magnetic field: B<BRP.
Figure 9. Test Condition of AH921 (Output Saturation Voltage)
Note 7: The output saturation voltage VSAT is measured at VCC=3.5V and VCC=24V.
Note 8: The device is put under the magnetic field: B>BOP.
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Test Circuit and Test Conditions (Continued)
Figure 10. Test Condition of AH921 (Output Leakage Current)
Note 9: The device is put under the magnetic field: B<BRP.
Typical Performance Characteristics
4.0
4.0
VCC=5V
3.5
VCC=12V
3.5
ICC (mA)
ICC (mA)
3.0
2.5
2.0
2.5
2.0
1.5
o
TA=25 C
1.5
1.0
4
6
8
10
12
14
16
18
20
22
-25
24
0
25
50
75
100
125
o
TA ( C)
VCC (V)
Figure 11. ICC vs. VCC
Jun. 2010
3.0
Figure 12. ICC vs. TA
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
50
40
40
30
30
BOP/BRP/BHYS (Gauss)
BOP/BRP/BHYS (Gauss)
Typical Performance Characteristics (Continued)
20
o
TA=25 C
10
BOP
BRP
0
BHYS
20
10
VCC=12V
BOP
0
BRP
BHYS
-10
-10
-20
-20
4
8
12
16
20
24
-25
0
25
VCC (V)
50
75
100
125
o
TA ( C)
Figure 13. BOP/BRP/BHYS vs. VCC
Figure 14. BOP/BRP/BHYS vs. TA
180
240
160
220
140
200
VSAT (mV)
VSAT (mV)
120
100
80
180
160
140
60
o
TA=25 C
40
20
0
VCC=12V
100
0
5
10
15
20
-25
25
0
25
50
75
100
125
o
TA ( C)
IOUT (mA)
Figure 15. VSAT vs. IOUT
Jun. 2010
VCC=5V
120
VCC=12V
Figure 16. VSAT vs. TA
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
10
Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Typical Performance Characteristics (Continued)
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 17. PD vs. TA
Typical Application
Output
CL
0.1 F
VCC
Figure 18. Typical Application Circuit of AH921
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Mechanical Dimensions
TO-92S-3
°
°
Unit: mm(inch)
0.75(0.030)
TYP
44
46
1.420(0.056)
1.620(0.064)
3.900(0.154)
4.100(0.161)
1.200(0.047)
1.500(0.059)
1.850(0.073)
2.150(0.085)
Package Sensor
Location
0.440(0.017)
TYP
2.900(0.114)
3.100(0.122)
1.600(0.063)
TYP
14.000(0.551)
15.000(0.590)
0.390(0.015)
TYP
1.270(0.050)
TYP
Jun. 2010
0.380(0.015)
TYP
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
12
Preliminary Datasheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH
AH921
Mechanical Dimensions (Continued)
2.650(0.104)
2.950(0.116)
0.300(0.012)
0.600(0.024)
Unit: mm(inch)
1.500(0.059)
1.700(0.067)
SOT-23-3
1.450(0.057)
MAX.
°
°
Jun. 2010
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
13
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