Capacitive Sensor Signal ZSSC3230 Conditioner IC Datasheet Description Features The ZSSC3230 is a CMOS integrated circuit for accurate capaci- Low current consumption: 1.3A at 1 sample per second tance-to-digital conversion and sensor-specific correction of Maximum target input capacitance: 30pF capacitive sensor signals. Digital compensation of sensor offset, Programmable capacitance span and offset sensitivity, and temperature drift is accomplished via an internal High sampling rate with 2ms at 14-bit resolution digital signal processor running a correction algorithm with calibration coefficients stored in a nonvolatile, multiple-time ADC resolution: Adjustable in speed and resolution, 18-bit programmable (NVM) memory. Programming the ZSSC3230 is maximum simple via the serial interface. The interface is used for the PC- Internal auto-compensated temperature sensor not stress controlled calibration procedure, which programs the set of sensitive calibration coefficients in memory. The ZSSC3230 is configurable Programmable measurement sequence, single-shot and for capacitive sensors with capacitances up to 30pF and will automatic cycling of measurements with end-of-sequence provide an output resolution that is scalable up to 18-bit. It is interrupt output compatible with single-ended capacitive sensors. Measured and Oversampling modes using internal averaging corrected sensor values can be output as I2C ( 3.4MHz). Interrupt features The ZSSC3230 provides accelerated signal processing, increased Integrated NVM for configuration and free space for resolution, and improved noise immunity in order to support high- customer use speed control, safety, and real-time sensing applications with the highest requirements for energy efficiency. Small die size External reset pin (low active) No external trimming components required Basic Application Diagram Highly integrated CMOS design VDD VSS Physical Characteristics VDD Supply voltage V : 1.68V to 3.6V VSS DD C0 CC Operating temperature: -40C to 125C depending on the part C1 code EOC I2C Interface compatible, supporting Standard Mode(100kHz) SDA SCL Fast Mode (400kHz) High-Speed Mode (3.4MHz) Capacitive input range 0 to 30pF ZSSC3230 Capacitive offset compensation 0 to 15pF 2 SDA Available in 4 4 mm 24-PQFN package or as die SCL Typical Applications Humidity sensors Pressure sensors, level sensors Smart, digital, capacitive sensors for energy-efficient solutions Consumer / white goods (e.g., HVAC) Medical applications 2019 Integrated Device Technology, Inc. 1 October 15, 2019 ZSSC3230 Datasheet Block Diagram Vreg int V VDD TP Temperature AGND / CM Bias Current Reference Voltage Regulator Generator Generator V Sensor TN Power Ctr. VSS ZSSC3230 EOC C0 DSP Core A PDM (Calculations, D Communication) 18 Bit SCL CC Pre-Amplifier SDA Cmeasure CC RESQ MTP I2C Clock System ROM Power-ON Generator Control Unit Ring Reset Oscillator 2019 Integrated Device Technology, Inc. 2 October 15, 2019 Charge-Voltage Converter Multiplexer