ZSSC3122AA1B

Overview

The ZSSC3122AA1B is a CMOS integrated circuit designed for accurate capacitance-to-digital conversion and sensor-specific correction of capacitive sensor signals. It features an internal digital signal processor that executes correction algorithms using calibration coefficients stored in non-volatile EEPROM. The device supports capacitive sensors with maximum input capacitance up to 10pF and sensitivity of 125aF/LSB. It accommodates both single-ended and differential capacitive sensors. Measured and corrected values are output via I2C, SPI, PDM, or alarm interfaces. Accuracy reaches ±0.25% full-scale output at -20 to 125°C with 3V or 5V supply.

Feature Summary

• Digital compensation for sensor offset, sensitivity, and temperature drift using internal DSP and stored calibration coefficients.
• Configurable for capacitive sensors up to 10pF with high resolution sensitivity of 125aF/LSB.
• Supports piece-wise 1st and 2nd order sensor compensation or up to 3rd order single-region compensation.
• Internal temperature compensation reference eliminates the need for external components.

Applications

• Capacitive pressure sensors
• Capacitive level detection systems
• Proximity sensing applications

Procurement Notes

Verify the specific suffix AA1B against official Renesas documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB layout constraints for die-die bonding if applicable. Confirm availability status directly with authorized distributors as inventory levels fluctuate.

Selection Notes

Select this component when precise capacitance-to-digital conversion is required for capacitive sensors up to 10pF. It is suitable for designs needing digital compensation for temperature drift without external trimming. Consider its I2C/SPI interface capabilities for system integration requirements.

Part Context

The ZSSC3122 belongs to the ZSSC3122 series of sensor signal conditioners from Renesas Electronics. It complements the company's broader IoT sensor portfolio by providing accurate signal conditioning and digitization. The part is often paired with MCUs to form complete sensing solutions for industrial and consumer applications.

Replacement Considerations

The ZSSC3123 is documented as a pin-to-pin compatible alternative within the same family. Verify functional equivalence and parameter alignment before substitution.