A1391, A1392, A1393, and A1395
Micro Power 3 V Linear Hall Effect Sensors
withTri-State Output and User-Selectable Sleep Mode
Features and Benefits
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High-impedance output during sleep mode
Compatible with 2.5 to 3.5 V power supplies
10 mW power consumption in the active mode
Miniature MLP/DFN package
Ratiometric output scales with the ratiometric supply
reference voltage (VREF pin)
Temperature-stable quiescent output voltage and
sensitivity
Wide ambient temperature range: –20°C to 85°C
ESD protection greater than 3 kV
Solid-state reliability
Preset sensitivity and offset at final test
Description
The A139x family of linear Hall effect sensor integrated circuits
(ICs) provide a voltage output that is directly proportional to
an applied magnetic field. Before amplification, the sensitivity
of typical Hall effect ICs (measured in mV/G) is directly
proportional to the current flowing through the Hall effect
transducer element inside the ICs. In many applications, it
is difficult to achieve sufficient sensitivity levels with a Hall
effect sensor IC without consuming more than 3 mA of current.
The A139x minimize current consumption to less than 25
μA
through the addition of a user-selectable sleep mode. This makes
these devices perfect for battery-operated applications such as:
cellular phones, digital cameras, and portable tools. End users
can control the current consumption of the A139x by applying a
¯LEEP
¯¯¯
logic level signal to the S¯ ¯ ¯ ¯ pin. The outputs of the devices
are not valid (high-impedance mode) during sleep mode. The
high-impedance output feature allows the connection of multiple
A139x Hall effect devices to a single A-to-D converter input.
The quiescent output voltage of these devices is 50 % nominal of
the ratiometric supply reference voltage applied to the VREF pin
of the device. The output voltage of the device is not ratiometric
with respect to the SUPPLY pin.
Package: 6 pin MLP/DFN (suffix EH)
Approximate scale
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Functional Block Diagram
VCC
To all subcircuits
Hall Element
Regulator
R
Ratio
/ 2
R
Ratio
/ 2
VREF
Dynamic Offset
Cancellation
Amp
Filter
Out
OUT
Gain
Offset
Programming Logic
SLEEP
Circuit Reference Current
GND
1391-DS, Rev. 2
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
