ZSSC3123AA2

The ZSSC3123AA2 is a CMOS Signal Conditioner for accurate capacitance-to-digital 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 ZSSC3123 is configurable for capacitive sensors with capacitances up to 260pF and a sensitivity of 125aF/LSB to 1pF/LSB depending on resolution, speed and range settings. 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 I?C™, SPI, PDM or alarms. The I?C™ interface can be used for a simple PC-controlled calibration procedure to program a set of calibration coefficients into an on-chip EEPROM.