A1172ECGLT Allegro Microsystems Inc, A1172ECGLT Datasheet

IC,HALL-EFFECT SWITCH,SINGLE-ENDED,BGA,4PIN,PLASTIC

A1172ECGLT

Manufacturer Part Number
A1172ECGLT
Description
IC,HALL-EFFECT SWITCH,SINGLE-ENDED,BGA,4PIN,PLASTIC
Manufacturer
Allegro Microsystems Inc
Type
Omnipolar Switchr
Datasheet

Specifications of A1172ECGLT

Sensing Range
±55G Trip, ±6G Release
Voltage - Supply
1.65 V ~ 3.5 V
Current - Supply
2mA
Current - Output (max)
±1mA
Output Type
Digital, Push-Pull
Features
High Sensitivity
Operating Temperature
-40°C ~ 85°C
Package / Case
4-WLCSP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
620-1244-2
A1172ECGTR
Features and Benefits
▪ Micropower operation
▪ Operation with either north or south pole—
▪ 1.65 to 3.5 V battery operation
▪ Chopper stabilization
▪ Sol id state reliability
▪ Small size: WLCSP (≈ 1 mm × 1 mm × 0.5 mm)
▪ Complementary, push-pull outputs eliminate need for
Package: 4 pin WLCSP (suffix CG)
1172-DS, Rev. 4
no magnetic orientation required during assembly
pull-up resistor
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
Not to scale
VDD
Micropower Ultra-Sensitive Hall-Ef fect Switch
Clock / Logic
Amp
Functional Block Diagram
GND
Low-Pass
Filter
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.
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
Continued on the next page…
Latch
Latch
VOUTPS
VOUTPN
A1172

Related parts for A1172ECGLT

A1172ECGLT Summary of contents

Page 1

Micropower Ultra-Sensitive Hall-Ef fect Switch 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 ▫ ...

Page 2

... Hall-effect switches. Selection Guide Part Number Package 4 bumped wafer-level chip-scale A1172ECGLT package (WLCSP) *Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Supply Voltage Reverse Supply Voltage ...

Page 3

A1172 OPERATING CHARACTERISTICS Characteristic Symbol Electrical Characteristics valid over full operating voltage range and T 2 Supply Voltage Range V OUT(SAT) Output On Voltage V OUT(HIGH) Period t PERIOD Chopping Frequency 3 Supply Slew Rate I DD(EN) I DD(DIS) Supply ...

Page 4

A1172 THERMAL CHARACTERISTICS may require derating at maximum conditions* Characteristic Package Thermal Resistance *Additional thermal information is available on the Allegro website. Micropower Ultra-Sensitive Hall-Effect Switch Symbol On 1-layer PCB R θJA On 4-layer PCB Power Dissipation versus Ambient Temperature ...

Page 5

A1172 300 250 200 150 100 50 0 -60 -40 300 250 200 150 100 Micropower Ultra-Sensitive Hall-Effect Switch Operating Characteristics Saturation Voltage versus Temperature - (°C) A Saturation Voltage versus Supply Voltage 1.5 ...

Page 6

A1172 -60 - Micropower Ultra-Sensitive Hall-Effect Switch Average Supply Current versus Temperature - (°C) A Average Supply Current versus Supply Voltage 1.5 ...

Page 7

A1172 100 -60 -40 100 Micropower Ultra-Sensitive Hall-Effect Switch Period versus Temperature - (°C) A Period ...

Page 8

A1172 Low Average Power Internal timing circuitry activates the IC for 50 μs and deacti- vates it for the remainder of the period (50 ms). A short awake time allows stabilization prior to the sampling and data-latching on the falling ...

Page 9

A1172 It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall element) between the supply and ground of the device to reduce both external noise and noise generated by the chopper stabilization technique. ...

Page 10

A1172 0.05 C 0.200 ±0.030 SEATING PLANE 0.227 0.228 B 0.500 A 1 Copyright ©2008-2009, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; ...

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