A1321/A1322/A1323
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
The A132X family of linear Hall-effect sensors are optimized, sensitive, and tem-
perature-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
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 amplifier, and a rail-to-rail low-
impedance output stage.
A proprietary dynamic offset cancellation technique, with an internal high-fre-
quency 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 amplifier 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.
The A132X family is provided in a 3-pin single in-line package (UA) and a 3-pin
surface mount package (LH).
Package UA, 3-pin SIP
1. VCC
2. GND
3. VOUT
1
2
3
Package LH, 3-pin Surface Mount
1. VCC
2. VOUT
3. GND
3
1
2
Features and Benefits
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..........................................
8 V
*
Reverse-Battery Voltage, V
RCC
.......................
–0.1 V
Reverse-Output Voltage, V
ROUT
.....................
–0.1 V
Output Sink Current, I
OUT
.............................
10 mA
Operating Temperature
Ambient, T
A
, Range E..................
–40ºC to 85ºC
Ambient, T
A
, Range L................
–40ºC to 150ºC
Maximum Junction, T
J(max)
........................165ºC
Storage Temperature, T
S
..................
–65ºC to 170ºC
*
Additional
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
Use the following complete part numbers when ordering:
Part Number
A1321EUA
A1321ELH
A1321LUA
A1321LLH
A1322EUA
A1322ELH
A1322LUA
A1322LLH
A1323EUA
A1323ELH
A1323LUA
A1323LLH
Package
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
Ambient
–40ºC to 85ºC
Sensitivity, Typ.
5.000 mV/G
–40ºC to 150ºC
–40ºC to 85ºC
3.125 mV/G
–40ºC to 150ºC
–40ºC to 85ºC
2.500 mV/G
–40ºC to 150ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
current draw may be observed at voltages
above the minimum supply Zener clamp voltage, V
Z(min)
,
due to the Zener diode turning on.
A1321-DS Rev. 3
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
