ams extended its portfolio in automotive safety compliant sensors with the release of its first magnetic position sensors fully developed using the automotive industry’s programme for ISO 26262 safety compliance.
The launch of the new sensor series also includes the introduction of the company’s first magnetic position sensor in a System-in-Package (SiP) format.
The new AS5170 and AS5171 sensors were developed as SEooC (Safety Element out of Context) devices, as defined in the ISO 26262 functional safety standard. The diagnostic system built into them tests the entire device, from the Hall sensor front end, through the DSP engine which converts raw measurements of magnetic field strength into sine and cosine vectors, to the back-end interfaces and pins.
The AS517x sensors, which are qualified to AEC-Q100 Grade 0, very accurately measure the absolute angle of rotation. Their high 12-bit output resolution enables precise measurements, even for reduced angular excursions down to a minimum arc of 90°. This means they are ideal for a range of safety-critical automotive applications including chassis height, gear shifters, electronic power steering, exhaust gas recirculation, and brake pedal as well as throttle position sensing.
The AS5171 comes in an SiP format which integrates the sensor die and capacitors in a single, encapsulated 3-pin package. The SiP offers improved ESD and EMC performance, as well as enhanced supply protection. The supply and output pins are protected against over-voltages up to +20 V. The supply pin also offers -20 V of protection against reverse polarity. The SiP eliminates the requirement to mount a position sensor IC on a PCB, thus reducing component count and system cost, and making for easier design and assembly into the end product.
The AS5171A provides an analog output, and the AS5171B provides a digital output, which may be programmed either as a PWM interface or as a SENT-compliant interface. The analog AS5170A and digital AS5170B ICs are housed in an 8-pin SOIC package.
Like every other magnetic position sensor from ams, the AS5170 and AS5171 benefit from stray magnetic field immunity, enabling unimpaired operation even in the presence of strong magnetic fields generated by electric motors, high current-carrying cables and other external devices. The high sensitivity of the Hall sensor front-end enables the use of small, low-cost target magnets and supports a wide magnetic field strength input range of 5 – 90 mT.
For more information contact NuVision Electronics, +27 (0)11 608 0144, [email protected], www.nuvisionelec.co.za
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| Email: | [email protected] |
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