AS8579-ASST

AS8579-ASST is a capacitive sensor that detects the change of capacity in different applications. The capacitive sensor measures the relative change of the impedance (RealCapSense, due to our measurement principle), dependent on the circuit. This can be used for human being detection as well as many other applications. The IC capture the current of a metal object and applies algorithms to determine the capacitive and resistive information (impedance). This information can be read via SPI interface that can be also used for IC configuration. This high precision performance sensor also supports a multitude of diagnostic features that meet standard functional safety requirements up to ASIL B. The application includes autonomous driving applications e.g.: hands on steering wheel detection, detection of any human presence inside a vehicle, detection of any human presence exterior of vehicles e.g.: automatic trunk opener.

• Accurate capacitive measurement(including resistive information), I/Q-signal demodulation
• Higher durability and lower system costs
• VAR-SEN & FIX-SEN function to avoid parasitic influences from cable and PCB
• Enabler for safety critical applications, processed according functional safety standard
• Suitable for automotive applications, AEC-Q100 Grade 1 qualified
• VDD range from 4.8 to 5.2V (static condition)
• Regulator voltage is 3.45V typical, maximum supply current is 50mA
• Maximum supply current is 50mA, output current is 4mA max
• System sensitivity range from 9.375 to 15.625LSB/pF (PGA=0, CBG=0, TXV=2, FREQ=3)
• SSOP24 package, operating ambient temperature range from -40 to 125°C