ZSSC3123AI2T

Overview

The ZSSC3123AI2T is a cLite capacitive sensor signal conditioner manufactured by Renesas Electronics. It provides accurate capacitance-to-digital conversion with digital compensation for sensor offset, sensitivity, and temperature drift using an internal DSP and non-volatile EEPROM. The device supports differential or single-ended inputs up to 10pF target capacitance. It features I2C, SPI, PDM, or alarm outputs. Operating voltage ranges from 2.3V to 5.5V with a typical supply current of 100uA. Sampling rates vary from 0.7ms at 8-bit to 18.5ms at 14-bit resolution. Accuracy reaches ±0.25% full-scale output over the industrial temperature range.

Feature Summary

• Integrated digital signal processor performs piece-wise first and second order sensor compensation and third order single-region compensation without external components.
• Internal temperature compensation reference eliminates the need for external calibration components.
• Configurable for capacitive sensors with capacitances up to 10pF and sensitivity of 125aF/LSB.
• Layout optimized for die-die bonding with sensors to enable low-cost, high-density chip-on-board assembly.

Applications

• Capacitive touch sensing interfaces
• Proximity detection systems
• Level sensing applications
• Force measurement sensors

Procurement Notes

Verify the specific suffix 'AI2T' against official Renesas documentation to confirm package type and tape/reel specifications. Ensure compatibility with system power requirements within the 2.3V to 5.5V range. Confirm interface protocol support matches design needs. Check for obsolescence status as previous variants in this series have faced end-of-life notices. Validate environmental ratings for intended operating temperatures.

Selection Notes

Select this component when high accuracy and digital compensation are required for capacitive sensors. It is suitable for designs needing low power consumption and minimal external components. Consider the available sampling rates and resolution trade-offs. Verify that the sensor capacitance falls within the 10pF limit. Ensure the application benefits from the integrated EEPROM for permanent calibration storage.

Part Context

This part belongs to the ZSSC3123 family of capacitive sensor signal conditioners. It shares functional similarities with the ZSSC3122 but may differ in packaging or specific interface configurations. The family is designed for precise capacitance-to-digital conversion with built-in calibration capabilities. Renesas acquired IDT, which originally developed these sensor interface products.

Replacement Considerations

The ZSSC3122 is noted as pin-to-pin compatible with similar functionality. Verify electrical parameters and interface options before substitution. Other parts in the ZSSC3123 series may offer different packaging or performance characteristics. Consult official datasheets for detailed comparison of specifications and physical dimensions.