Integrated Device Technology Low Voltage Capacitive Sensor Signal Conditioner with Digital Output ZSSC3122AI1BN

The ZSSC3122 cLite™ is a CMOS integrated circuit for accurate capacitance-to-digit al conversion and sensor-specific correction of capacitive sensor signals. Digital compensation of sensor offset, sensitivity and temperature drift is accomplished via an internal digital signal processor running a correction algorithm with calibration coefficients stored in a non-volatile EEPROM . The ZSSC3122 is configurable for capacitive sensors with capacitances up to 10pF and a sensitivity of 125aF/ LSB . It is compatible with both single capacitive sensors (both terminals must be accessible) and differential capacitive sensors. Measured and corrected sensor values can be output as I2C , SPI , PDM , or alarms. The I2C interface can be used for a simple PC -controlled calibration procedure to program a set of calibration coefficients into an on-chip EEPROM . The calibrated ZSSC3122 and a specific sensor are mated digitally: fast, precise, and without the cost overhead of trimming by external devices or laser.