AS8579-ASSM

AS8579-ASSM 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. It can be used for human being detection as well as many other applications. The IC captures the current of a metal object and applies an algorithm to determine the capacitive and resistive information. This information can be read via SPI interface which 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. 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), typ regulator voltage is 3.45V
• Maximum supply current is 50mA (drivers enabled), system CLK frequency range from 3 to 50MHz
• Maximum output current is 4mA (MISO), pull-down value range from 30 to 200Kohm (DOUT)
• Max system power supply rejection is ±20LSB
• SSOP24 package, operating ambient temperature range from -40 to 125°C