Product category:
Sensors and Data Acquisition
News Release from: Allegro MicroSystems Europe | Subject: A139x family
Edited by the Electronicstalk Editorial
Team on 26 February 2008
Hall-effect ICs sleep to save power
Sensor ICs provide a voltage output that is directly proportional to an applied magnetic field.
The A139x family of linear Hall effect sensor ICs from Allegro MicroSystems Europe combines micropower operation, a tristate output and a user-selectable sleep mode The new sensor ICs provide a voltage output that is directly proportional to an applied magnetic field
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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The sleep mode allows the devices to operate at a current consumption of less than 25uA, which contrasts with typical Hall-effect ICs whose sensitivity before amplification is directly proportional to the current flowing through the transducer element.
As a result, it is difficult to achieve sufficient sensitivity levels with traditional Hall-effect sensor ICs without consuming more than 3mA of current.
This low-current operation and the resulting power consumption of less than 10mW makes these devices perfect for battery-operated applications such as mobile telephones, digital cameras, and portable tools.
Further reading
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The new ATS660LSB from Allegro MicroSystems is a digital differential gear-tooth sensor module for demanding automotive transmission applications.
High-efficiency microstepping motor modules
The SLA7042M and SLA7044M from Allegro MicroSystems Europe are motor controller/driver modules for two-phase unipolar stepper motors.
The operating voltage of 3V makes them compatible with 2.5-3.5V supplies.
There are four devices in the family, differentiated only by sensitivity: A1391, 1.25mV/Gs; A1392, 2.5mV/Gs; A1393, 5mV/Gs; and A1395, 10mV/Gs.
Despite the low power consumption of the circuitry in the A139x family, the features required to produce a highly accurate linear Hall effect IC have not been compromised.
Each BiCMOS monolithic circuit integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and proprietary dynamic offset cancellation circuits.
End-of-line post-packaging factory programming allows precise control of device sensitivity and offset.
End users can control the current consumption of the A139x by applying a logic level signal to the sleep pin.
The outputs of the devices are not valid during sleep mode, when they switch to high-impedance mode.
The high-impedance output feature allows the connection of multiple A139x Hall-effect devices to a single A/D convertor input.
The quiescent output voltage of these devices is 50% nominal of the ratiometric supply reference voltage applied to the reference pin of the device.
The new sensors will operate over a wide ambient temperature range from -20 to +85C, and feature electrostatic discharge protection of greater than 3kV.
The A1391x Series devices are available in a small (2.0 x 3.0 x 0.75mm) microleaded MLP/DFN package.
The package is Pb (lead) free, with 100% matt tin leadframe plating.
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