A1326LUA-T Allegro Microsystems Inc, A1326LUA-T Datasheet - Page 5
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A1326LUA-T
Manufacturer Part Number
A1326LUA-T
Description
IC HALL EFFECT SENSOR 3-SIP
Manufacturer
Allegro Microsystems Inc
Specifications of A1326LUA-T
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
T
after temperature cycling T
back to up 25°C.
Linearity Sensitivity Error The 132x is designed to provide
linear output in response to a ramping applied magnetic field.
Consider two magnetic fields, B1 and B2. Ideally the sensitivity
of a device is the same for both fields for a given supply voltage
and temperature. Linearity sensitivity error is present when there
is a difference between the sensitivities measured at B1 and B2.
Linearity Sensitivity Error is calculated separately for the positive
(LIN
earity Sensitivity Error (%) is measured and defined as:
and
where:
and B(++), B(+), B(– –), and B(–) are positive and negative mag-
netic fields with respect to the quiescent voltage output such that
|B(++)| > |B(+)| and |B(– –)| > |B(– )| .
A
Subject to Change Without Notice
= 25°C, and Sens
Preliminary Datasheet
A1324, A1325,
ERR+
February 25, 2011
) and negative (LIN
and A1326
Lin
Lin
Lin
Sens
ERR+
ERR–
ERR
(25°C)1
Bx
= max(| Lin
=
=
=
1–
1–
|V
A
is the value of sensitivity at T
OUT(Bx)
up to 150°C, down to –40°C, and
ERR–
Sens
Sens
Sens
Sens
) applied magnetic fields. Lin-
ERR+
B(– –)
B(++)
B(+)
B(–)
B
– V
Linear Hall Effect Sensor ICs with Analog Output
X
| , |Lin
OUT(Q)
×
×
100%
100%
ERR–
|
| )
A
= 25°C
(7)
(8)
(9)
Symmetry Sensitivity Error The magnetic sensitivity of a
device is constant for any two applied magnetic fields of equal
magnitude and opposite polarities.
Symmetry Error (%), is measured and defined as:
where Sens
tive and negative magnetic fields such that |B(+)| = |B(–)|.
Ratiometry Error The A132x features a ratiometric output.
This means that the quiescent voltage output, V
sensitivity, Sens, and clamp voltages, V
are proportional to the supply voltage, V
the supply voltage increases or decreases by a certain percent-
age, each characteristic also increases or decreases by the same
percentage. Error is the difference between the measured change
in the supply voltage, relative to 5 V, and the measured change in
each characteristic.
The ratiometric error in quiescent voltage output, Rat
(%), for a given supply voltage, V
The ratiometric error in magnetic sensitivity, Rat
given supply voltage, V
Rat
Rat
VOUT(Q)
VOUT(Q)
Bx
Sym
is defined as in equation 9, and B(+), B(–) are posi-
=
=
ERR
1–
1–
V
=
OUT(Q)VCC
Sens
1–
CC
, is defined as:
V
Sens
Sens
VCC
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
V
CC
CC
B(+)
B(–)
Sens
CC
V
V
V
OUT(Q)5V
, is defined as:
×
5V
100%
CLPHIGH
CC
×
. In other words, when
100%
×
OUT(Q)
100%
and V
SENS
VOUT(Q)
(%), for a
, magnetic
CLPLOW
(12)
(13)
(11)
,
5