Description
TheA139x 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 theA139x by applying a
logic level signal to the SLEEP 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 theVREF pin
of the device. The output voltage of the device is not ratiometric
with respect to the SUPPLY pin.
1391-DS, Rev. 6
Features and Benefits
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
Micro Power 3 V Linear Hall Effect Sensor ICs
withTri-State Output and User-Selectable Sleep Mode
Continued on the next page…
Package: 6 pin MLP/DFN (suffix EH)
Functional Block Diagram
Approximate scale
A1391, A1392, A1393, and A1395
Amp
Out
VCC
OUT
GND
Filter
Dynamic
Of
fset
Cancellation
Gain
Offset
Hall Element
Regulator
Programming Logic
Circuit Reference Current
To all subcircuits
RRatio / 2
VREF
SLEEP