A3517LUA Allegro MicroSystems, A3517LUA Datasheet - Page 5

• Manufacturer Part Number: A3517LUA
• Description: RATIOMETRIC/ LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION
• Manufacturer: Allegro MicroSystems

Quiescent Voltage Output. In the quiescent state (no
magnetic field), the output is ideally equal to one-half of
the supply voltage over the operating voltage and tem-
perature range (V
tolerances and thermal considerations, there is a tolerance
on the quiescent voltage output and on the quiescent
voltage output as a function of supply voltage and ambient
temperature. For purposes of specification, the quiescent
voltage output as a function of temperature is defined as
accuracy, over the operating temperature range, in gauss.
Sensitivity. The presence of a south-pole magnetic field
perpendicular to the package face (the branded surface)
will increase 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
ture is defined as
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This calculation yields the device’s equivalent
The stability of sensitivity as a function of tempera-
∆Sens
∆V
(∆T)
OQ(∆T)
Sens =
OQ
=
≈ V
Sens
=
CC
V
V
OQ(TA)
O(500G)
(TA)
/
Sens
2
). Due to internal component
Sens
1000 G
– Sens
(25°C)
– V
– V
(25°C)
OQ(25°C)
O(-500G)
(25°C)
x 100%
(1)
(2)
(3)
LINEAR HALL-EFFECT SENSORS
Ratiometry. The A3517xUA and A3518xUA feature a
ratiometric output. The quiescent voltage output and
sensitivity are proportional to the supply voltage
(ratiometric).
voltage output is defined as
and the per cent ratiometric change in sensitivity is defined
as
Linearity and Symmetry. The on-chip output stage is
designed to provide a linear output to within 500 mV of
either rail with a supply voltage of 5 V. This is equivalent
to approximately ±800 gauss of ambient field. Although
application of stronger magnetic fields will not damage
these devices, it will force the output into a non-linear
region. Linearity in per cent is measured and defined as
and output symmetry as
FOR HIGH-TEMP. OPERATION
The per cent ratiometric change in the quiescent
∆Sens
∆V
Lin– =
Lin+ =
Sym =
OQ(∆V)
(∆V)
=
=
2 (V
2 (V
V
V
V
Sens
V
V
O(-500G)
O(500G)
O(500G)
OQ(VCC)
OQ
O(-250G)
O(250G)
V
V
(VCC)
– V
CC
CC
– V
– V
– V
O(-500G)
/ 5 V
/ 5 V
RATIOMETRIC,
/ V
/ Sens
– V
– V
3517
OQ
OQ
OQ
OQ(5V)
OQ
OQ
)
x 100%
)
(5V)
x 100%
x 100%
x 100%
AND
x 100%
3518
(4)
(5)
(6)
(7)
(8)