Description
The A1357 device is a high precision, programmable two-wire Hall-effect linear sensor IC with a pulse width modulated (PWM) current. The A1357 device converts an analog signal from its internal Hall sensor element to a digitally encoded PWM signal. The coupled noise immunity of the digitally encoded PWM is far superior to the noise immunity of an analog output signal.

Features and Benefits
▪ Two-wire output enables reduced wiring costs in long wire systems
▪ Simultaneous programming of PWM carrier frequency, quiescent duty cycle (QDC), and sensitivity for system optimization
▪ Fully differential signal path increases EMC immunity and reduces output offset drifts
▪ Factory programmed sensitivity temperature coefficient and quiescent duty cycle drift
▪ Programmability at end-of-line
▪ Pulse width modulated (PWM) current output provides increased noise and EMC immunity compared to an analog output
▪ Precise recoverability after temperature cycling • Duty cycle clamps provide short circuit diagnostic capabilities
▪ Optional 50% duty cycle calibration test mode at device power up
▪ Wide ambient temperature range: –40°C to 150°C
▪ Resistant to mechanical stress