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A1381 Datasheet(PDF) 8 Page - Allegro MicroSystems

Part No. A1381
Description  Programmable Linear Hall Effect Sensor ICs with Analog Output
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A1381 Datasheet(HTML) 8 Page - Allegro MicroSystems

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Programmable Linear Hall Effect Sensor ICs with Analog Output
Available in a Miniature Thin Profile Surface Mount Package
A1381, A1382,
A1383, and A1384
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Quiescent Voltage Output Drift Through Temperature Range
Due to internal component tolerances and thermal considerations,
the quiescent voltage output, VOUT(Q), may drift from its nominal
value over the operating ambient temperature, TA. For purposes
of specification, the Quiescent Voltage Output Drift Through
Temperature Range, ∆VOUT(Q) (mV), is defined as:
∆V
OUT(Q)
V
OUT(Q)(TA) –VOUT(Q)(25°C)
=
.
(3)
Sensitivity
The presence of a south polarity magnetic field, per-
pendicular to the branded surface of the package face, increases
the output voltage from its quiescent value toward the supply
voltage rail (assuming that the polarity bit, POL, is in its initial
state of logic 0). The amount of the output voltage increase is
proportional to the magnitude of the magnetic field applied.
Conversely, the application of a north polarity field decreases the
output voltage from its quiescent value. This proportionality is
specified as the magnetic sensitivity, Sens (mV/G), of the device,
and it is defined as:
V
OUT(BPOS) – VOUT(BNEG)
BPOS – BNEG
Sens =
,
(4)
where BPOS and BNEG are two magnetic fields with opposite
polarities.
Guaranteed Sensitivity Range
The magnetic sensitivity, Sens,
can be programmed around its nominal value, 2.5 to 7.5 mV/G
depending on device type, within the sensitivity range limits:
Sens(min) and Sens(max). Refer to the Guaranteed Quiescent
Voltage Output Range section for a conceptual explanation of
how value distributions and ranges are related.
Average Sensitivity Step Size
Refer to the Average Quiescent
Voltage Output Step Size section for a conceptual explanation.
Sensitivity Programming Resolution
Refer to the Quiescent
Voltage Output Programming Resolution section for a conceptual
explanation.
Sensitivity Temperature Coefficient
Device sensitivity changes
as temperature changes, with respect to its programmed sensitiv-
ity temperature coefficient, TCSENS. TCSENS is programmed at
150°C, and calculated relative to the nominal sensitivity program
ming temperature of 25°C. TCSENS (%/°C) is defined as:
Sens
T2 – SensT1
Sens
T1
T2–T1
1
TC
Sens =
×100%
,
⎟⎟
⎜⎜
⎟⎟
⎜⎜
(5)
where T1 is the nominal Sens programming temperature of 25°C,
and T2 is the TCSENS programming temperature of 150°C. The
ideal value of Sens over the full ambient temperature range,
SensIDEAL(TA), is defined as:
Sens
T1 [100% + TCSENS (TA –T1)]
Sens
IDEAL(TA) =
(6)
Guaranteed Sensitivity Temperature Coefficient Range
The
magnetic sensitivity temperature coefficient can be programmed
within its limits: TCSens(max) and TCSens(min). Refer to the
Guaranteed Quiescent Voltage Output Range section for a con-
ceptual explanation of how value distributions and ranges are
related.
Average Sensitivity Temperature Coefficient Step Size
Refer
to the Average Quiescent Voltage Output Step Size section for a
conceptual explanation.
Sensitivity Temperature Coefficient Programming Resolution
Refer to the Quiescent Voltage Output Programming Resolution
section for a conceptual explanation.
Sensitivity Drift Through Temperature Range
Second order
sensitivity temperature coefficient effects cause the magnetic
sensitivity, Sens, to drift from its ideal value over the operating
ambient temperature range, TA. For purposes of specification, the
sensitivity drift through temperature range, ∆SensTC, is defined
as:
Sens
TA – SensIDEAL(TA)
Sens
IDEAL(TA)
∆Sens
TC =
×100% .
(7)
Sensitivity Drift Due to Package Hysteresis
Package stress and
relaxation can cause the device sensitivity at TA = 25°C to change
during and after temperature cycling.


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