ALLEGRO A1321, A1322, A1323 User Manual

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A1321/A1322/A1323

Ratiometric Linear Hall Effect Sensor for High-Temperature Operation

The A132X family of linear Hall-effect sensors are optimized, sensitive, and temperature-stable. These ratiometric Hall-effect sensors provide a voltage output that is proportional to the applied magnetic ﬁ eld. The A132X family has a quiescent

Package UA, 3-pin SIP

1. VCC

2. GND

3. VOUT

Package LH, 3-pin Surface Mount

1. VCC

2. VOUT

3. GND 1

output voltage that is 50% of the supply voltage and output sensitivity options of 2.5mV/G, 3.125mV/G, and 5mV/G. The features of this family of devices are ideal for use in the harsh environments found in automotive and industrial linear and rotary position sensing systems.

Each device has a BiCMOS monolithic circuit which integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain ampliﬁ er, and a rail-to-rail low- impedance output stage.

A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The high frequency clock allows for a greater sampling rate, which results in higher accuracy and faster signal processing capability. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Having the Hall element and an ampliﬁ er on a single chip minimizes many problems normally associated with low-level analog signals.

Output precision is obtained by internal gain and offset trim adjustments made at end-of-line during the manufacturing process.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC.......................................... 8 V

Reverse-Battery Voltage, V Reverse-Output Voltage, V Output Sink Current, I Operating Temperature Ambient, T Ambient, T Maximum Junction, T Storage Temperature, T

Additional current draw may be observed at voltages

above the minimum supply Zener clamp voltage, V due to the Zener diode turning on.

OUT

, Range E..................–40ºC to 85ºC

, Range L................–40ºC to 150ºC

.......................–0.1 V

RCC

.....................–0.1 V

ROUT

............................. 10 mA

........................165ºC

J(max)

..................–65ºC to 170ºC

Z(min)

The A132X family is provided in a 3-pin single in-line package (UA) and a 3-pin surface mount package (LH). Each package is available in a lead (Pb) free version (sufﬁ x, –T) , with a 100% matte tin plated leadframe.

Features and Beneﬁ ts

 Temperature-stable quiescent output voltage

Precise recoverability after temperature cycling

Output voltage proportional to magnetic ﬂ ux density Ratiometric rail-to-rail output Improved sensitivity 4.5 to 5.5 V operation Immunity to mechanical stress Solid-state reliability

Robust EMC protection

A1321-DS, Rev. 5

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

A1321/A1322/A1323

Ratiometric Linear Hall Effect Sensor for High-Temperature Operation

Product Selection Guide

Part Number Pb-free Packing* Mounting

A1321ELHLT –

A1321ELHLT-T Yes

A1321EUA –

A1321EUA-T Yes

A1321LLHLT –

A1321LLHLT-T Yes

A1321LUA –

A1321LUA-T Yes

A1322ELHLT –

A1322ELHLT-T Yes

A1322EUA –

A1322EUA-T Yes

A1322LLHLT –

A1322LLHLT-T Yes

A1322LUA –

A1322LUA-T Yes

A1323ELHLT –

A1323ELHLT-T Yes

A1323EUA –

A1323EUA-T Yes

A1323LLHLT –

A1323LLHLT-T Yes

A1323LUA –

A1323LUA-T Yes

*Contact Allegro for additional packing options.