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A1365LKTTN-5-T Datasheet(PDF) 15 Page - Allegro MicroSystems

Part No. A1365LKTTN-5-T
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365LKTTN-5-T Datasheet(HTML) 15 Page - Allegro MicroSystems

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Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
A1365
15
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
VOUT(Q)EXPECTED(TA) should be calculated using the actual
measured values of VOUT(Q)T1 and TCQVO rather than program-
ming target values.
Quiescent Voltage Output Drift Through Tem-
perature Range (ΔVOUT(Q)TC)
Due to internal component tolerances and thermal considerations,
the Quiescent Voltage Output (VOUT(Q)) may drift from its
nominal value through the operating ambient temperature (TA).
The Quiescent Voltage Output Drift Through Temperature Range
VOUT(Q)TC) is defined as:
DVOUT(Q)TC = VOUT(Q)(TA) – VOUT(Q)EXPECTED(TA)
(5)
∆VOUT(Q)TC should be calculated using the actual measured
values of ∆VOUT(Q)(TA) and ∆VOUT(Q)EXPECTED(TA) rather than
programming target values.
Sensitivity (Sens)
The presence of a south polarity magnetic field, perpendicular
to the branded surface of the package face, increases the output
voltage from its quiescent value toward the supply voltage rail.
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:
Sens
=
,
V– V
OUT(BPOS)
OUT(BNEG)
BPOS – BNEG
(6)
where BPOS and BNEG are two magnetic fields with opposite
polarities.
Initial Unprogrammed Sensitivity (Sensinit )
Before any programming, Sensitivity has a nominal value that
depends on the SENS_COARSE bits setting. Each A1365 variant
has a different SENS_COARSE setting.
Sensitivity Programming Range (SensPR)
The magnetic sensitivity (Sens) can be programmed around its
initial value within the sensitivity range limits: SensPR(min) and
SensPR(max). Exceeding the specified Sensitivity Range will
cause Sensitivity Drift Through Temperature Range ΔSensTC to
deteriorate beyond the specified values. Refer to the Quiescent
Voltage Output Range section for a conceptual explanation of
how value distributions and ranges are related.
Average Fine Sensitivity Programming Step
Size (StepSENS)
Refer to the Average Quiescent Voltage Output Programming
Step Size section for a conceptual explanation.
Sensitivity Programming Resolution (ErrPGSENS)
Refer to the Quiescent Voltage Output Programming Resolution
section for a conceptual explanation.
Sensitivity Temperature Coefficient (TCSENS)
Device sensitivity changes as temperature changes, with respect
to its programmed sensitivity temperature coefficient, TCSENS.
TCSENS is programmed at 150°C, and calculated relative to the
nominal sensitivity programming temperature of 25°C. TCSENS
(%/°C) is defined as:
TC
SENS
=
× 100%
,
Sens – Sens
T2
T1
Sens
T1
T2–T1
1
(7)
where T1 is the nominal Sens programming temperature of 25°C,
and T2 is the TCSENS programming temperature of 150°C. The
expected value of Sens over the full ambient temperature range,
SensEXPECTED(TA), is defined as:
Sens
Sens
EXPECTED(TA)T1
=
×
TC
(T –T1)
SENS
A
100
100% +
(8)
SensEXPECTED(TA) should be calculated using the actual measured
values of SensT1 rather than programming target values.
Mold Ejector
Pin Indent
Branded
Face
Magnetic Flux
Direction Causing the
Output to Increase
Figure 6: Magnetic Flux Polarity


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