Melexis launches hall-effect sensor IC for electric power-assisted steering
With an operating temperature between -40℃ and 160℃, the firm says the device combines high linearity with excellent thermal stability, including low offset and sensitivity drift.
It’s been developed as a safety element out of context (SEooC), and complies with the ISO 26262 standard and AEC Q-100 Grade 0.
Supporting functional safety level ASIL-C in digital (SENT or SPC) mode and ASIL-B in analog mode, the IC can detect internal failures and enter a safe state to prevent unintended vehicle behavior.
The TSSOP-16 package also includes two redundant dies to enable support for safety critical applications like steering and braking systems.
The hall-effect IC can also be used in automotive and industrial contactless position-sensing use cases including steering torque sensors, acceleration, brake, or clutch pedal sensors, absolute linear position sensors, float-level sensors, non-contacting potentiometers, small-angle position sensors and small stroke position sensors.
The programmable measurement range and multi-point calibration allow flexibility, and the variety of output protocols enables one IC to be used in multiple applications.
The short PWM code protocol permits measurements to be taken and transmitted upon detection of a trigger pulse.
This means up to four sensors can be synchronized up to 2kHz, enabling simultaneous magnetic measurements with deterministic latency.
Additionally, Melexis claims, the IC features a high refresh rate and low noise, enabling high control-loop speeds.
The device also features a 48-bit programmable identification number.
Within standard operating temperature and at a standard supply voltage between 4.5-5.5, its typical main clock frequency is 24MHz with ±3.5% total drift.
The device can sustain a supply voltage of 28V up to 48 hours or 37V up to 60 seconds, however the firm says exposure to absolute maximum ratings conditions for extend periods can affect reliability.