Programmable Hall-effect sensor offers high flexibility

November 30, 2016 // By Christoph Hammerschmidt
Allegro’s new A1342 Hall-effect linear sensor IC offers high precision and flexibility through programmability. Designed to serve automotive as well as non-automotive applications, the device allows generating a customized output from a magnetic input signal.

The BiCMOS, monolithic IC incorporates a Hall sensing 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, advanced output linearization circuitry, and advanced diagnostics.

 

A key feature of the A1342 is its ability to produce a highly linear device output for non-linear input magnetic fields. To achieve this, the device features 16-segment customer-programmable linearization, where a unique linearization coefficient factor is applied to each segment. Linearization coefficients are stored in a look-up table in EEPROM. Through these features, the A1342 offers a particularly high flexibility.

 

This device has two configurable output options: SENT or PWM. In addition to SAEJ2716, the IC includes two additional proprietary SENT options: SSENT and ASENT. Both protocols enable bus configurations with up to four devices on one SENT line to reduce system costs. SSENT provides sequential access to the sensors connected to the same line. SSENT provides a low overhead method to maximize the sensor bandwidth on this single SENT line, minimizing impact on system performance. ASENT provides random access to all the sensors on the common SENT line.

Both protocols allow individual sensors on the same line to enter diagnostic mode while the other sensors continue to respond to queries, allowing for the highest diagnostic coverage while maintaining 100% availability of the sensor solution.

The A1342 is available in a through-hole, lead (Pb) free 3-pin SIP package (UC suffix), with 100% matt-tin leadframe plating.  The UC package includes integrated capacitors for improved ESD performance and to enable PCB-less designs. 

More information:   A1342 Hall-effect linear sensor IC