A1391 Datasheet, PDF (1/16 Pages) Allegro MicroSystems – Micro Power 3V Linear Hall Effect Sensor with Tri-State Output and User-Selectable Sleep Mode

A1391, A1392, A1393, and A1395
Micro Power 3 V Linear Hall Effect Sensor ICs
withTri-State Output and User-Selectable Sleep Mode
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
Package: 6 pin MLP/DFN (suffix EH)
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
logic level signal to the S¯¯L¯¯E¯¯E¯¯P 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.
Approximate scale
Continued on the next page…
Functional Block Diagram
VCC
To all subcircuits
Hall Element
Regulator
R_Ratio / 2
R_Ratio / 2
VREF
SLEEP
Amp
Out
Gain
Offset
Programming Logic
Circuit Reference Current
OUT
GND
1391-DS, Rev. 7