ZSSC3123AA7R

Overview

The ZSSC3123AA7R is a low-voltage capacitive sensor signal conditioner IC manufactured by Renesas Electronics. It provides accurate capacitance-to-digital conversion with 14-bit resolution and ±0.25% full-scale accuracy across temperatures from -20°C to 125°C at 3V or 5V supply. The device operates on a voltage range of 2.3V to 5.5V, consuming as low as 60µA during active operation and less than 1µA in sleep mode up to 85°C. It supports sampling rates up to 0.7ms for 8-bit resolution. The component features digital compensation for sensor offset, sensitivity, and temperature drift using internal calibration coefficients stored in non-volatile EEPROM. It interfaces via I2C, SPI, PDM, or alarm outputs and is housed in a TSSOP-14 package.

Feature Summary

• Integrates digital signal processing for piece-wise first and second-order sensor compensation and third-order single-region compensation without external components.
• Includes an internal temperature compensation reference to eliminate the need for external temperature sensing elements.
• Supports configurable capacitance span and offset settings tailored to specific sensor requirements.
• Enables die-die bonding compatibility for low-cost, high-density chip-on-board assembly applications.

Applications

• Capacitive position sensing in industrial automation
• Level detection in liquid or granular material storage
• Proximity sensing in consumer electronics
• Force measurement in precision instrumentation

Procurement Notes

Verify the complete part number including suffix AA7R to ensure correct packaging and tape-and-reel configuration. Confirm RoHS compliance status and lead time directly with authorized distributors or Renesas Electronics. Ensure ESD protection measures are implemented during handling due to the sensitive CMOS input structure. Cross-reference datasheet revisions to confirm pinout and electrical characteristics match design requirements.

Selection Notes

Select this component when high accuracy over wide temperature ranges is required for capacitive sensors up to 10pF. Consider the built-in digital compensation capabilities if minimizing external calibration hardware is a priority. Evaluate power consumption constraints against the 60µA active current and sub-1µA sleep mode specifications. Verify interface compatibility with host controllers supporting I2C, SPI, or PDM protocols.

Part Context

The ZSSC3123 belongs to Renesas' cLite series of capacitive sensor signal conditioners. It is functionally related to the ZSSC3122, offering similar capacitance-to-digital conversion capabilities with integrated digital correction algorithms. The device replaces traditional analog conditioning circuits by providing calibrated digital output, reducing system complexity and improving long-term stability through non-volatile memory storage of calibration data.

Replacement Considerations

The ZSSC3122 is documented as pin-to-pin compatible with the ZSSC3123. Verify functional equivalence regarding compensation algorithms and interface options before substitution. No other direct substitutes are confirmed in available documentation.