Diodes AH211 User Manual
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211
General Description
The AH211 is an integrated Hall sensor with output
driver and frequency generator designed for electronic
commutation of brush-less DC motor applications. The
device includes an on-chip Hall sensor for magnetic
sensing, an amplifier that amplifies the Hall voltage, a
Schmitt trigger to provide switching hysteresis for
noise rejection, a temperature compensation circuit to
compensate the temperature drift of Hall sensitivity,
two complementary open-collector drivers for sinking
large load current. It also includes an internal band-gap
regulator which is used to provide bias voltage for
internal circuits.
Place the device in a variable magnetic field, while the
magnetic flux density is larger than threshold BOP, DO
will be turned on (low) and DOB (and FG) will be
turned off (high). This output state is held till the magnetic flux density reversal falls below BRP causing DO
to be turned off (high) and DOB (and FG) turned on
(low).
AH211 is available in TO-94 (SIP-4L) package.
Features
· On-Chip Hall Sensor
· 3.5V to 16V Supply Voltage
· 400mA (avg) Output Sink Current
o
· -20
· Built-in FG Output
· Low Profile TO-94 (SIP-4L) Package
· ESD Rating: 600V (Machine Model)
C to 85oC Operating Temperature
Applications
· Dual-Coil Brushless DC Motor
· Dual-Coil Brushless DC Fan
· Revolution Counting
· Speed Measurement
TO-94
Figure 1. Package Type of AH211
Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited
1
Data Sheet
TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211
Pin Configuration
Z4 Package
(TO-94)
Pin Description
Pin Number Pin Name Function
1 FG Frequency Generation
2 DO Output 1
3 DOB Output 2
4 GND Ground
4
3
2
1
Figure 2. Pin Configuration of AH211 (Front View)
GND
DOB
DO
FG
Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited
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Data Sheet
TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211
Functional Block Diagram
Regulator
Hall
Sensor
Amplifier
Ordering Information
Temperature
Compensation
Schmitt
Trigger
1
FG
Figure 3. Functional Block Diagram of AH211
Output
Driver
2
DO
3
DOB
4
GND
AH211 -
Circuit Type
Package
Z4: TO-94 (SIP-4L)
E1: Lead Free
G1: Green
Magnetic Characteristics
A: 5 to 60 Gauss
B: 90 Gauss
Package
TO-94
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.
Temperature
Range
o
-20 to 85
C
Lead Free Green Lead Free Green
AH211Z4-AE1 AH211Z4-AG1 AH211 AH211Z4-G1 Bulk
AH211Z4-BE1 AH211Z4-BG1 AH211 AH211Z4-G1 Bulk
Part Number Marking ID
Packing
Typ e
Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited
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Data Sheet
TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211
Absolute Maximum Ratings (Note 1)
(T
=25oC)
A
Parameter Symbol Value Unit
Supply Voltage V
CC
20 V
Magnetic Flux Density B Unlimited Gauss
400 mA
Output Current
Continuous
Hold 600 mA
I
O
Peak (Start up) 800 mA
FG Voltage V
FG Current I
Power Dissipation P
Die to Atmosphere θ
FG
FG
D
JA
30 V
20 mA
550 mW
227
o
C/W
Thermal Resistance
Die to Package Case θ
Storage Temperature T
JC
STG
49
-50 to 150
o
C/W
o
C
ESD (Machine Model) 600 V
ESD (Human Body Model) 6000 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. "Absolute Maximum Ratings" for extended period may affect
device reliability.
Recommended Operating Conditions
(TA=25oC)
Parameter Symbol Min Max Unit
Supply Voltage
Ambient Temperature
V
CC
T
A
Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited
4
3.5 16 V
-20 85
o
C
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