Allegro A1322ELH Ratiometric linear hall effect sensor for high-temperature operation Datasheet

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 field. 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.
Package UA, 3-pin SIP
1. VCC
2. GND
3. VOUT
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 lowimpedance output stage.
1
2
3
Package LH, 3-pin Surface Mount
1. VCC
2. VOUT
3. GND
3
1
2
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 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).
Features and Benefits
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 8 V*
Reverse-Battery Voltage, VRCC....................... –0.1 V
Reverse-Output Voltage, VROUT ..................... –0.1 V
Output Sink Current, IOUT ............................. 10 mA
Operating Temperature
Ambient, TA, Range E.................. –40ºC to 85ºC
Ambient, TA, Range L................ –40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS .................. –65ºC to 170ºC
*Additional
current draw may be observed at voltages
above the minimum supply Zener clamp voltage, VZ(min),
due to the Zener diode turning on.
A1321-DS Rev. 3
Temperature-stable quiescent output
Improved sensitivity
voltage
4.5 to 5.5 V operation
Precise recoverability after temperature cycling
Immunity to mechanical stress
Output voltage proportional to magnetic flux
Solid-state reliability
density
Robust EMC protection
Ratiometric rail-to-rail output
Use the following complete part numbers when ordering:
Part Number
Package
A1321EUA
A1321ELH
A1321LUA
A1321LLH
A1322EUA
A1322ELH
A1322LUA
A1322LLH
A1323EUA
A1323ELH
A1323LUA
A1323LLH
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
SIP
Surface Mount
Ambient
Sensitivity, Typ.
–40ºC to 85ºC
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
A1321/A1322/A1323
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
Functional Block Diagram
V+
Amp
Filter
Dynamic Offset
Cancellation
VCC
Gain
VOUT
Out
Offset
0.1 µF
Trim
Control
GND
Terminal List
Symbol
VCC
VOUT
GND
Description
Connects power supply to chip
Output from circuit
Ground
Number
Package LH Package UA
1
1
2
3
3
2
2
A1321-DS Rev. 3
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
DEVICE CHARACTERISTICS1 over operating temperature (TA) range, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Electrical Characteristics; VCC = 5 V, unless otherwise noted
Supply Voltage
Vcc(op)
Operating; Tj < 165°C
4.5
Supply Current
Icc
B = 0, Iout = 0
–
Quiescent Voltage
Vout(q)
B = 0, TA = 25ºC, Iout = 1 mA
2.425
Vout(H)
B = +X, Iout = –1 mA
–
Output Voltage3
B = –X, Iout = 1 mA
–
Vout(L)
3
Output Source Current Limit
Iout(LM)
B = –X, Vout → 0
–1.0
Supply Zener Clamp Voltage
VZ
Icc = 11 mA = Icc(max) + 3
6
Output Bandwidth
BW
–
Clock Frequency
fC
–
Output Characteristics; over VCC range, unless otherwise noted
A1321; Cbypass = 0.1 µF, no load
–
Noise, Peak-to-Peak4
VN
A1322; Cbypass = 0.1 µF, no load
–
A1323; Cbypass = 0.1 µF, no load
–
Output Resistance
Rout
Iout ≤ ±1 mA
–
Output Load Resistance
RL
Iout ≤ ±1 mA, VOUT to GND
4.7
VOUT to GND
–
Output Load Capacitance
CL
Typ.2
Max.
Units
5.0
5.6
2.5
4.7
0.2
–1.5
8.3
30
150
5.5
8
2.575
–
–
–
–
–
–
V
mA
V
V
V
mA
V
kHz
kHz
–
–
–
1.5
–
–
40
25
20
3
–
10
mV
mV
mV
Ω
kΩ
nF
1 Negative
current is defined as conventional current coming out of (sourced from) the specified device terminal.
data is at TA = 25°C. They are for initial design estimations only, and assume optimum manufacturing and application
conditions. Performance may vary for individual units, within the specified maximum and minimum limits.
3 In these tests, the vector X is intended to represent positive and negative fields sufficient 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 specification includes both digital and analog noise.
2 Typical
3
A1321-DS Rev. 3
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
MAGNETIC CHARACTERISTICS1,2 over operating temperature range, TA; VCC = 5 V, Iout = –1 mA; unless otherwise noted
Max
Units4
Characteristics
Symbol
Test Condition
Min
Typ3
A1321; TA = 25ºC
4.750
5.000
5.250
mV/G
5
Sensitivity
Sens
2.969
3.125
3.281
mV/G
A1322; TA = 25ºC
2.375
2.500
2.625
mV/G
A1323; TA = 25ºC
Delta Vout(q) as a funcVout(q)(∆T)
Defined in terms of magnetic flux density, B
–
–
±10
G
tion of temperature
Vout(q)(∆V)
–
–
±1.5
%
Ratiometry, Vout(q)
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 TA = max5 ∆Sens(TAmax) From hot to room temperature
–2.5
–
7.5
%
Delta Sens at TA = min5 ∆Sens(TAmin) From cold to room temperature
–6
–
4
%
Sensitivity Drift6
SensDrift
TA = 25°C; after temperature cycling and over time
–
1
2
%
LH Package
Delta Sens at TA = max5 ∆Sens(TAmax) From hot to room temperature
–5
–
5
%
Delta Sens at TA = min5 ∆Sens(TAmin) From cold to room temperature
–3.5
–
8.5
%
Sensitivity Drift6
SensDrift
TA = 25°C; after temperature cycling and over time
–
0.328
2
%
1 Additional information on chracteristics is provided in the section Characteristics Definitions, on the next page.
2 Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.
3 Typical data is at T = 25°C, except for ∆Sens, and at x.x Sens. Typical data are for initial design estimations only, and assume optimum
A
manufacturing and application conditions. Performance may vary for individual units, within the specified maximum and minimum limits.
In addition, the typical values vary with gain.
4 10 G = 1 millitesla.
5 After 150ºC pre-bake and factory programming.
6 Sensitivity drift is the amount of recovery with time.
4
A1321-DS Rev. 3
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
Characteristic Definitions
Quiescent Voltage Output. In the quiescent state (no
magnetic field), 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 considerations, 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 specification, the quiescent voltage
output as a function of temperature is defined in terms of magnetic flux density, B, as:
∆Vout(q)(∆Τ) =
∆Vout(q)(ΤΑ) – ∆Vout(q)(25ºC)
Sens(25ºC)
Sens(25ºC)
× 100%
VCC ÷ 5 V
× 100%
(4)
∆Sens(VCC) ÷ ∆Sens(5V)
VCC ÷ 5 V
× 100%
(5)
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 fields will not
damage these devices, it will force the output into a non-linear
region. Linearity in percent is measured and defined as:
Lin+ =
Lin– =
The stability of sensitivity as a function of temperature is
defined as:
∆Sens(∆Τ) =
∆Vout(q)(VCC) ÷ ∆Vout(q)(5V)
and the percent ratiometric change in sensitivity is
defined as:
(2)
2B
Sens(ΤΑ) – Sens(25ºC)
∆Vout(q)(∆V) =
∆Sens(∆V) =
Sensitivity. The presence of a south-pole magnetic field perpendicular 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 field
applied. Conversely, the application of a north pole will decrease
the output voltage from its quiescent value. This proportionality
is specified as the sensitivity of the device and is defined as:
Sens =
The percent ratiometric change in the quiescent voltage output is
defined as:
(1)
This calculation yields the device’s equivalent accuracy,
over the operating temperature range, in gauss (G).
∆Vout(–B) – ∆Vout(+B)
Ratiometric. The A132X family features a ratiometric output.
The quiescent voltage output and sensitivity are proportional to
the supply voltage (ratiometric).
∆Vout(+B) – ∆Vout(q)
2(∆Vout(+B / 2) – Vout(q) )
∆Vout(–B) – ∆Vout(q)
2(∆Vout(–B / 2) – Vout(q) )
× 100%
× 100%
(6)
(7)
and output symmetry as:
(3)
Sym =
∆Vout(+B) – ∆Vout(q)
∆Vout(q) – Vout(–B)
× 100%
(8)
5
A1321-DS Rev. 3
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
Typical Characteristics
150
125
115
85
25
0
-20
Average Supply Current (ICC) vs Temperature
Vcc = 5 V
8
7.5
7
6.5
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
-40
ICC (mA)
(30 pieces, 3 fabrication lots)
TA (°C)
Average Positive Linearity (Lin+) vs Temperature
Vcc = 5 V
104
104
103
103
102
102
101
Lin– (%)
100
99
101
100
98
99
98
97
97
96
96
150
125
115
85
TA (°C)
Average Ratiometry, VOUT(q)(∆V) vs Temperature
Average Ratiometry, ∆Sens(∆V), vs Temperature
101
101
4.5 to 5.0V
5.5 to 5.0V
100.8
100.8
4.5 to 5.0 V
5.5 to 5.0 V
100.6
100.4
TA (°C)
150
150
125
115
85
25
0
99
-20
99.2
99
-40
99.4
99.2
125
99.6
99.4
115
99.6
100
99.8
85
100
99.8
100.2
25
100.2
0
Ratiometry (%)
100.4
-40
100.6
Ratiometry (%)
25
-40
TA (°C)
0
95
150
125
115
85
25
0
-20
-40
95
-20
Lin+ (%)
Average Negative Linearity (Lin–) vs Temperature
Vcc = 5 V
105
-20
105
TA (°C)
Continued on the next page...
6
A1321-DS Rev. 3
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
Typical Characteristics, continued
(30 pieces, 3 fabrication lots)
Average Absolute Quiescent Output Voltage, Vout(q), vs Temperature
Quiescent Output Voltage, Vout(q), vs Vcc
TA = 25°C
Vcc = 5 V
2.575
3
2.9
2.55
2.7
Vout(q) (V)
Vout(q) (V)
2.8
2.525
2.5
2.475
2.6
1321
1322
1323
2.5
2.4
2.3
2.45
2.2
2.1
2
150
125
115
85
25
0
-20
-40
2.425
4.5
TA (°C)
6
5.5
5.5
5
1321
1322
1323
4.5
4.5
A1322
4
4
Sens (mV/G)
A1321
A1323
3.5
3
3.5
3
2.5
2
2.5
1.5
1
150
125
115
85
25
0
-20
-40
2
4.5
5
Vcc (V)
TA (°C)
Average Delta Quiescent Output Voltage, Vout(q)(∆T), vs Temperature
∆ in readings at each temperature are relative to 25°C
Vcc = 5 V
8
6
6
4
4
0
-6
TA (°C)
150
125
115
85
25
0
-10
-20
-8
-10
-40
-8
150
-4
-6
125
-4
115
-2
0
-2
2
-20
0
-40
2
∆Sens (%)
Vout(q)(∆T) (G)
Average Delta Sensitivity, ∆Sens, vs Temperature
∆ in readings at each temperature are relative to 25°C
Vcc = 5 V
10
8
5.5
85
Sens (mV/G)
5
10
5.5
Average Sensitivity, Sens, vs Vcc
TA = 25°C
25
6
Average Absolute Sensitivity, Sens, vs Temperature
Vcc = 5 V
5
Vcc (V)
TA (°C)
7
A1321-DS Rev. 3
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
Package LH, 3-Pin; (SOT-23W)
3.10 .122
2.90 .114
1.49 .059
NOM
3
8º
0º
0.28 .011
NOM
0.70 .028
BSC
0.20 .008
0.13 .005
C
0.96 .038
NOM
2.10 .083
1.85 .073
2.40 .094
BSC
A
0.25 .010
MIN
3.00 .118
2.70 .106
1
1.00 .039
BSC
2
0.95 .037
BSC
0.25 .010
BSC
Seating Plane
Gauge Plane
0.50 .020
0.30 .012
1.13 .045
0.87 .034
0.55 .022
REF
A
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
Hall element
B
Active Area Depth 0.28 [.011]
C
Fits SC–59A Solder Pad Layout
0.15 .006
0.00 .000
0.95 .037
BSC
Package UA, 3-Pin; (TO-92)
.164 4.17
.159 4.04
45°
BSC
.0195 0.50
NOM
.0805 2.04
NOM
.122 3.10
.117 2.97
.062 1.57
.058 1.47
.0565 1.44
NOM
45°
BSC
B
.085 2.16
MAX
.640 16.26
.600 15.24
.031 0.79
REF
A
1
2
3
.017 0.44
.014 0.35
.019 0.48
.014 0.36
.050 1.27
BSC
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
A Dambar removal protrusion
B Hall element
8
A1321-DS Rev. 3
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
The products described herein are manufactured under one
or more of the following U.S. patents: 5,045,920; 5,264,783;
5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319;
5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other
patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time
to time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability,
or manufacturability of its products. Before placing an order, the
user is cautioned to verify that the information being relied upon is
current.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other
rights of third parties which may result from its use.
Copyright © 2004, Allegro MicroSystems, Inc.
9
A1321-DS Rev. 3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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