Description
The A1172 is an ultra-sensitive, pole-independent Hall-effect
switch with a latched digital output. It features operation at
low supply currents and voltages, making it ideal for battery-
operated electronics. The 1.65 to 3.5 V operating supply
voltage and unique clocking algorithm reduce the average
operating power requirements to less than 15 W with a
2.75 V supply.
The A1172 has two push-pull output structures. Omnipolar
activation for the output function is available on each output
structure. As such, either a north or south pole of sufficient
strength turns the available outputs off or on. The A1172
contains two complementary outputs. Therefore, for a fixed
magnetic field, one output will be in a high voltage state and
one output will be in a low voltage state.
Improved stability is made possible through dynamic offset
cancellation using chopper stabilization, which reduces the
residual offset voltage normally caused by device overmolding,
temperature dependencies, and thermal stress. This device
1172-DS, Rev. 5
Features and Benefits
Micropower operation
Operation with either north or south pole—
no magnetic orientation required during assembly
1.65 to 3.5 V battery operation
Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
Sol id state reliability
Small size: WLCSP ( 1 mm × 1 mm × 0.5 mm)
Complementary, push-pull outputs eliminate need for
pull-up resistor
Micropower Ultra-Sensitive Hall-Ef fect Switch
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Package: 4 pin WLCSP (suffix CG)
Functional Block Diagram
Not to scale
A1172
Dynamic Offset
Cancellation
VOUTPN
VOUTPS
VDD
Low-Pass
Filter
Clock
/
Logic
Latch
Latch
Amp
GND
Sample and Hold
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.
