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A1172 Datasheet Preview

A1172 Datasheet

Micropower Ultra-Sensitive Hall-Ef fect Switch

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A1172
Micropower Ultra-Sensitive Hall-Effect Switch
www.daFtaesMhaetiecutr4orupe.cosowmaernodpeBrateionnefits
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
Solid state reliability
Small size: WLCSP (1 mm × 1 mm × 0.5 mm)
Complementary, push-pull outputs eliminate need for
pull-up resistor
Package: 4 pin WLCSP (suffix CG)
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 μW 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
Not to scale
VDD
Continued on the next page…
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.
Functional Block Diagram
1172-DS
Clock / Logic
Amp
Low-Pass
Filter
GND
Latch
Latch
VOUTPS
VOUTPN




Allegro MicroSystems

A1172 Datasheet Preview

A1172 Datasheet

Micropower Ultra-Sensitive Hall-Ef fect Switch

No Preview Available !

A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Description (continued)
includes, on a single silicon chip, a Hall-voltage generator, a small-
wwsiwg.ndaaltaashmepelti4fuie.cro, mchopper stabilization, a latch, and a MOSFET
output.
TheA1172 device offers magnetically optimized solutions, suitable
for most applications. The wafer level chip scale package (WLCSP)
is approximately only 1 mm by 1 mm by 0.5 mm. This package is
smaller than most plastic packages and reduces the printed circuit
board area consumed by micropower Hall-effect switches.
Selection Guide
Part Number
Package
A1172ECGLT
4 bumped wafer-level chip-scale
package (WLCSP)
*Contact Allegro for additional packing options.
Pb-free
Pb-free chip with high-temperature solder
balls (RoHS compliant)
Packing*
4000 pieces per reel
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Off Voltage
Reverse Output Voltage
Output Current
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VDD
VRDD
VOUTx
VROUTx
IOUTx(Sink)
IOUTx(Source)
B
TA
TJ(max)
Tstg
Range E
Notes
Rating
5
–0.3
5
–0.3
–1
1
Unlimited
–40 to 85
165
–65 to 170
Units
V
V
V
V
mA
mA
G
ºC
ºC
ºC
Pin-out Diagram
A1 A2
B1 B2
(Bump-down view)
Terminal List Table
Name
VOUTPS
Number
A1
VOUTPN
A2
GND
VDD
B1
B2
Push-pull output
Function
Inverted push-pull output
Ground
Connects power supply to chip
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A1172
Description Micropower Ultra-Sensitive Hall-Ef fect Switch
Maker Allegro MicroSystems
Total Page 9 Pages
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