Diodes AH1891 User Manual
Description
AH1891
MINIATURE MICROPOWER OMNIPOLAR
HALL EFFECT SWITCH
Pin Assignments
The AH1891 is a miniature micropower Omnipolar Hall effect
switch IC with dual outputs specifically designed for portable
and battery powered equipment such as cellular phones and
portable PCs. To support battery powered equipment the
AH1891 has been optimized to operate over the suppl y range
of 1.8V to 3.3V and uses a sleep function to give an aver age
supply current of only 7uA. To minimize PCB space the
AH1891 is packaged in the small CSP package
(0.8mmx0.8mm) and the design integrates the external pull
up resistors to simplify the applications circuit.
The outputs of the AH1891 are switched with either a North or
South pole of sufficient strength. When the magnetic flux
density (B) is larger than operate point (Bop), Output 1 will
pull low and Output 2 will be inverted (high). The output states
are held until B is lower than release point (Brp).
NEW PRODUCT
The AH1891 is available in U-WLB0808-4 package.
Features
• Omnipolar (North or South) operation
• Low supply voltage of 1.8V to 3.3V
• Micropower operation
• Dual outputs for design flexibility
• Internal pull up and pull down capability
• Chopper stabilized design for:
o Superior temperature stability
o Superior temperature stability
o Superior temperature stability
• Good RF noise immunity
• -40°C to 85°C Operating Temperature
• ESD ＞ 4KV in Human Body Mode
• Miniature CSP package 0.8mm x 0.8mm
Typical Application Circuit
(Top View)
A1 A2
B1 B2
(Bottom View)
A2 A1
B2 B1
Applications
• Cellular phones
• Portable PCs and PDAs
• Digital cameras
• Portable and battery powered applications
AH1891
Document number: DS35207 Rev. 1 - 2
Vdd
GND
AH1891
1 of 7
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Output 1
Output 2
April 2011
© Diodes Incorporated
Pin Descriptions
Pin # Pin Name Description
A1 Out 1 Output Pin (active low)
A2 Out 2 Output Pin (active high)
B1 GND Ground
B2 Vdd Power Supply Voltage
Functional Block Diagram
NEW PRODUCT
Hall
Plate
AH1891
MINIATURE MICROPOWER OMNIPOLAR
HALL EFFECT SWITCH
Vdd
Power
Cancelling
Offset
Amp
switch
Latch
Out1
Hall
Plate
Cancelling
Output
Controller
Offset
Amp
Latch
GND
Vdd
Absolute Maximum Ratings (T
Symbol Parameter Values Unit
Vdd Supply voltage 5 V
B Magnetic flux density Unlimited
TA Operating Temperature Range -40 to +85 °C
Ts Storage Temperature Range -65 to +150 °C
PD Package Power Dissipation 166 mW
TJ Maximum Junction Temperature 150 °C
Recommended Operating Conditions (T
Symbol Parameter Conditions Rating Unit
Vdd Supply Voltage Operating 1.8 to 3.3 V
= 25°C)
A
= 25°C)
A
Out2
GND
AH1891
Document number: DS35207 Rev. 1 - 2
2 of 7
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April 2011
© Diodes Incorporated
AH1891
r
Electrical Characteristics (T
Symbol Parameter Conditions Min Typ. Max Unit
VOH Output On Voltage (High side) IO= -0.5mA Vdd-0.2 - - V
VOL Output On Voltage (Low side) IO= 0.5mA - - 0.2 V
Ioff Output Leakage Current Output off -
Idd(en)
Idd(dis) Chip disable - 5 8 uA
Idd(avg) Average supply current - 7 12 uA
Tawake Awake Time - 50 100 µs
Tperiod Period - 50 100 ms
D.C. Duty Cycle - 0.1 - %
Supply Current
Magnetic Characteristics (T
NEW PRODUCT
Symbol
Bops(south pole to brand side)
Bopn(north pole to brand side) -60 -40 -20
Brps(south pole to brand side)
Brpn(north pole to brand side) -50 -25 -12
Bhy(|Bopx|-|Brpx|) Hysteresis 15
Notes: 1. Typical data is at TA = 25°C, Vdd = 3V, and for design information only.
2. Operate point and release point will vary with supply voltage and operating temperature.
= 25°C, Vdd = 1.8V, unless otherwise specified)
A
Chip enable - 2 4 mA
= 25°C, Vdd = 1.8V~3.3V, Note 1)
A
Paramete
(Note 2)
Operate Point
Release Point
MINIATURE MICROPOWER OMNIPOLAR
HALL EFFECT SWITCH
<0.1
Min Typ. Max Unit
20 40 60
12 25 50
1 µA
(1mT=10 Gauss)
Gauss
AH1891
Document number: DS35207 Rev. 1 - 2
3 of 7
www.diodes.com
April 2011
© Diodes Incorporated
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