Linear Hall-Effect Sensor IC provides PWM 2-wire output.

Press Release Summary:



Featuring ambient temperature range of 40-150°C, customer-programmable Model A1357 converts analog signal from internal Hall sensor element to digitally encoded PWM output signal. Duty cycle of PWM output signal is proportional to applied magnetic field. BiCMOS, monolithic circuit inside A1357 integrates Hall element, precision temperature-compensating circuitry, high-gain amplifier, dynamic offset cancellation circuits, and PWM conversion circuitry.



Original Press Release:



Allegro MicroSystems, Inc. Introduces a New Customer Programmable Linear Hall-Effect Sensor IC



Pulse Width Modulated, Two-Wire Output

Worcester, MA - Allegro MicroSystems, Inc. introduces a new linear Hall-effect sensor IC with a wide ambient temperature range of 40°C to 150°C. Allegro's A1357 device is a high precision, customer programmable, Hall-effect linear IC with a pulse width modulated (PWM), current sourced (2-wire) output. The duty cycle (DC) of the PWM output signal (freq: 1 kHz) is proportional to an applied magnetic field. The device converts an analog signal from its internal Hall sensor element to a digitally encoded PWM output signal. The coupled noise immunity of the digitally encoded PWM output is far superior to the noise immunity of an analog output signal.

The BiCMOS, monolithic circuit inside of the A1357 integrates a Hall element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, and PWM conversion circuitry. The dynamic offset cancellation circuits reduce the residual offset voltage of the Hall element. Hall element offset is normally caused by device over molding, temperature dependencies, and thermal stress. The high-frequency offset cancellation (chopping) clock allows for a greater sampling rate, which increases the accuracy of the output signal and results in faster signal processing capability.

The A1357 sensor IC is targeted at the automotive and industrial markets and is provided in a lead (Pb) free, 3-pin, single inline package (KB suffix), with 100% matte tin leadframe plating. It is priced at $1.50 in quantities of 1,000.

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.

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