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PDF A1322 Data sheet ( Hoja de datos )
| Número de pieza | A1322 | |
| Descripción | Ratiometric Linear Hall Effect Sensor for High-Temperature Operation | |
| Fabricantes | Allegro MicroSystems | |
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A1321/A1322/A1323
Ratiometric Linear Hall Effect Sensor for High-Temperature Operation
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
1
2
3
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 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.
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).
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.
Features and Benefits
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
density
Solid-state reliability
Ratiometric rail-to-rail output
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
–40ºC to 150ºC
–40ºC to 85ºC
–40ºC to 150ºC
–40ºC to 85ºC
–40ºC to 150ºC
Sensitivity, Typ.
5.000 mV/G
3.125 mV/G
2.500 mV/G
A1321-DS Rev. 3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
1 page  
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 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 specification, the quiescent voltage
output as a function of temperature is defined in terms of mag-
netic flux density, B, as:
∆Vout(q)(∆Τ) =
∆Vout(q)(ΤΑ) – ∆Vout(q)(25ºC)
Sens(25ºC)
This calculation yields the device’s equivalent accuracy,
over the operating temperature range, in gauss (G).
(1)
Sensitivity. The presence of a south-pole magnetic field 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 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:
∆Vout(–B) – ∆Vout(+B)
Sens =
2B
(2)
The stability of sensitivity as a function of temperature is
defined as:
∆Sens(∆Τ) =
Sens(ΤΑ) – Sens(25ºC)
Sens(25ºC)
× 100%
(3)
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
defined as:
∆Vout(q)(∆V) =
∆Vout(q)(VCC) ÷ ∆Vout(q)(5V)
× 100%
VCC ÷ 5 V
(4)
and the percent ratiometric change in sensitivity is
defined as:
∆Sens(∆V) =
∆Sens(VCC) ÷ ∆Sens(5V) × 100%
VCC ÷ 5 V
(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+ =
∆Vout(+B) – ∆Vout(q)
× 100%
2(∆Vout(+B / 2) – Vout(q) )
Lin– =
∆Vout(–B) – ∆Vout(q)
× 100%
2(∆Vout(–B / 2) – Vout(q) )
and output symmetry as:
(6)
(7)
Sym =
∆Vout(+B) – ∆Vout(q)
∆Vout(q) – Vout(–B)
× 100%
(8)
A1321-DS Rev. 3
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet A1322.PDF ] | |
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