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A1321/A1322/A1323
A1321-DS Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
AB SO LUTE MAX I MUM RAT INGS
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.................. 40C to 85C
Ambient,
T
A
, Range L................ 40C to 150C
Maximum
Junction,
T
J(max)
........................165C
Storage Temperature, T
S
.................. 65C to 170C
*
Additional current draw may be observed at voltages
above the minimum supply Zener clamp voltage, V
Z(min)
,
due to the Zener diode turning on.

Temperature-stable quiescent output
voltage
Precise recoverability after temperature cycling
Output voltage proportional to magnetic fl ux
density
Ratiometric rail-to-rail output
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 amplifi er, 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 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.
The A132X family is provided in a 3-pin single in-line package (UA) and a 3-pin
surface mount package (LH).
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
Use the following complete part numbers when ordering:
Package UA, 3-pin SIP
Features and Benefi ts
Improved sensitivity
4.5 to 5.5 V operation
Immunity to mechanical stress
Solid-state reliability
Robust EMC protection
Package LH, 3-pin Surface Mount
1
2
3
1
2
3
Part Number
Package
Ambient
Sensitivity, Typ.
A1321EUA
SIP
40C to 85C
5.000 mV/G
A1321ELH
Surface Mount
A1321LUA
SIP
40C to 150C
A1321LLH
Surface Mount
A1322EUA
SIP
40C to 85C
3.125 mV/G
A1322ELH
Surface Mount
A1322LUA
SIP
40C to 150C
A1322LLH
Surface Mount
A1323EUA
SIP
40C to 85C
2.500 mV/G
A1323ELH
Surface Mount
A1323LUA
SIP
40C to 150C
A1323LLH
Surface Mount
1. VCC
2. GND
3. VOUT
1. VCC
2. VOUT
3. GND
2
A1321-DS Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
A1321/A1322/A1323
Functional Block Diagram
Amp
GND
VOUT
VCC
Out
Offset
Trim
Control
Gain
0.1 F
V+
Dyna
mic
O
ffse
t
Ca
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ll
a
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i
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Filte
r
Terminal List
Symbol
Description
Number
Package LH Package UA
VCC
Connects power supply to chip
1
1
VOUT
Output from circuit
2
3
GND
Ground
3
2
3
A1321-DS Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
A1321/A1322/A1323
DEVICE CHARACTERISTICS
1
over operating temperature (T
A
) range, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Typ.
2
Max.
Units
Electrical Characteristics; V
CC
= 5 V, unless otherwise noted
Supply Voltage
V
cc(op)
Operating; Tj < 165C
4.5
5.0
5.5
V
Supply Current
I
cc
B = 0, I
out
= 0
5.6
8
mA
Quiescent Voltage
V
out(q)
B = 0, T
A
= 25C, I
out
= 1 mA
2.425
2.5
2.575
V
Output Voltage
3
V
out(H)
B = +X, I
out
= 1 mA
4.7
V
V
out(L)
B = X, I
out
= 1 mA
0.2
V
Output Source Current Limit
3
I
out(LM)
B = X, V
out
0
1.0
1.5
mA
Supply Zener Clamp Voltage
V
Z
I
cc
= 11 mA = I
cc(max)
+ 3
6
8.3
V
Output Bandwidth
BW
30
kHz
Clock Frequency
f
C
150
kHz
Output Characteristics; over V
CC
range, unless otherwise noted
Noise, Peak-to-Peak
4
V
N
A1321; C
bypass
= 0.1 F, no load
40
mV
A1322; C
bypass
= 0.1 F, no load
25
mV
A1323; C
bypass
= 0.1 F, no load
20
mV
Output Resistance
R
out
I
out
1 mA
1.5
3
Output Load Resistance
R
L
I
out
1 mA, VOUT to GND
4.7
k
Output Load Capacitance
C
L
VOUT to GND
10
nF
1
Negative current is defi ned as conventional current coming out of (sourced from) the specifi ed device terminal.
2
Typical data is at T
A
= 25C. They are for initial design estimations only, and assume optimum manufacturing and application
conditions. Performance may vary for individual units, within the specifi ed maximum and minimum limits.
3
In these tests, the vector X is intended to represent positive and negative fi elds suffi cient to swing the output driver between fully OFF
and saturated (ON), respectively. It is NOT intended to indicate a range of linear operation.
4
Noise specifi cation includes both digital and analog noise.
4
A1321-DS Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
A1321/A1322/A1323
MAGNETIC CHARACTERISTICS
1,2
over operating temperature range, T
A
; V
CC
= 5 V, I
out
= 1 mA; unless otherwise noted
Characteristics
Symbol
Test Condition
Min
Typ
3
Max
Units
4
Sensitivity
5
Sens
A1321; T
A
= 25C
4.750
5.000
5.250
mV/G
A1322; T
A
= 25C
2.969
3.125
3.281
mV/G
A1323; T
A
= 25C
2.375
2.500
2.625
mV/G
Delta V
out(q)
as a func-
tion of temperature
V
out(q)(T)
Defi ned in terms of magnetic fl ux density, B
10
G
Ratiometry, V
out(q)
V
out(q)(V)
1.5
%
Ratiometry, Sens
Sens
(V)
1.5
%
Positive Linearity
Lin+
1.5
%
Negative Linearity
Lin
1.5
%
Symmetry
Sym
1.5
%
UA Package
Delta Sens at T
A
= max
5
Sens
(TAmax)
From hot to room temperature
2.5
7.5
%
Delta Sens at T
A
= min
5
Sens
(TAmin)
From cold to room temperature
6
4
%
Sensitivity Drift
6
Sens
Drift
T
A
= 25C; after temperature cycling and over time
1
2
%
LH Package
Delta Sens at T
A
= max
5
Sens
(TAmax)
From hot
to room temperature
5
5
%
Delta Sens at T
A
= min
5
Sens
(TAmin)
From cold to room temperature
3.5
8.5
%
Sensitivity Drift
6
Sens
Drift
T
A
= 25C; after temperature cycling and over time
0.328
2
%
1
Additional information on chracteristics is provided in the section Characteristics Defi nitions, on the next page.
2
Negative current is defi ned as conventional current coming out of (sourced from) the specifi ed device terminal.
3
Typical data is at T
A
= 25C, except for Sens, and at x.x Sens. Typical data are for initial design estimations only, and assume optimum
manufacturing and application conditions. Performance may vary for individual units, within the specifi ed maximum and minimum limits.
In addition, the typical values vary with gain.
4
10 G = 1 millitesla.
5
After 150C pre-bake and factory programming.
6
Sensitivity drift is the amount of recovery with time.
5
A1321-DS Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
A1321/A1322/A1323
Characteristic Defi nitions
Quiescent Voltage Output. In the quiescent state (no
magnetic fi eld), the output equals one half of the supply voltage
over the operating voltage range and the operating temperature
range. Due to internal component tolerances and thermal con-
siderations, there is a tolerance on the quiescent voltage output
both as a function of supply voltage and as a function of ambient
temperature. For purposes of specifi cation, the quiescent voltage
output as a function of temperature is defi ned in terms of mag-
netic fl ux density, B, as:
This calculation yields the device's equivalent accuracy,
over the operating temperature range, in gauss (G).
Sensitivity. The presence of a south-pole magnetic fi eld per-
pendicular to the package face (the branded surface) increases
the output voltage from its quiescent value toward the supply
voltage rail by an amount proportional to the magnetic fi eld
applied. Conversely, the application of a north pole will decrease
the output voltage from its quiescent value. This proportionality
is specifi ed as the sensitivity of the device and is defi ned as:

The stability of sensitivity as a function of temperature is
defi ned as:
Ratiometric. The A132X family features a ratiometric output.
The quiescent voltage output and sensitivity are proportional to
the supply voltage (ratiometric).
The percent ratiometric change in the quiescent voltage output is
defi ned as:
and the percent ratiometric change in sensitivity is
defi ned as:
Linearity and Symmetry. The on-chip output stage
is designed to provide a linear output with a supply voltage of
5 V. Although application of very high magnetic fi elds will not
damage these devices, it will force the output into a non-linear
region. Linearity in percent is measured and defi ned as:
and output symmetry as:
V
out(q)()
V
out(q)(
)
V
out(q)(25C)
Sens
(25C)
=
(1)
2B
V
out(B)
V
out(+B)
Sens
=
Sens
()
Sens
(
)
Sens
(25C)
Sens
(25C)
=
100%
(2)
(3)
V
CC
5 V
V
out(q)(V
CC
)
V
out(q)(5V)
V
out(q)(V)
=
100%
(4)
V
CC
5 V
=
100%
Sens
(V)
Sens
(V
CC
)
Sens
(5V)
(5)
=
100%
Lin+
V
out(+B)
2(V
out(+B / 2)
V
out(q)
)
V
out(q)
(6)
=
100%
Lin
V
out(B)
2(V
out(B / 2)
V
out(q)
)
V
out(q)
(7)
=
100%
Sym
V
out(+B)
V
out(q)
V
out(B)
V
out(q)
(8)