Capacitive Sensor Signal Conditioner with Digital Output

The ZSSC3123 cLite™ is a CMOS integrated circuit 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 nonvolatile 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 I2C, SPI, PDM, or alarms. The I2C interface can be used for a simple PC-controlled calibration procedure to program a set of calibration coefficients into an on-chip EEPROM. The calibrated ZSSC3123 and a specific sensor are mated digitally: fast, precise, and without the cost overhead of trimming by external devices or laser.

Features

  • Maximum target input capacitance: 260pF
  • Sampling rates as fast as 0.7ms @ 8-bit, 1.6ms @ 10-bit, 5.0ms @ 12-bit, 18.5ms @ 14-bit
  • Digital compensation of sensor: piece-wise 1st and 2nd order sensor compensation or up to 3rd order single-region sensor compensation
  • Digital compensation of 1st and 2nd order temperature gain and offset drift
  • Internal temperature compensation reference (no external components)
  • Programmable capacitance span and offset
  • Layout customized for die-die bonding with sensor for low-cost, high-density chip-on-board assembly
  • Accuracy as high as ±0.25% full-scale output @ -40°C to 125°C, 3V, 5V, Vsupply ±10% (see data sheet section 1.3 for restrictions)

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Range Carrier Type Buy Sample
ZSSC3123AA1B Active DICE WAFER 0 -40 to 125°C Wafer Availability
ZSSC3123AA1C Active DICEF WAFER 0 -40 to 125°C Wafer Availability
ZSSC3123AA2R Active PGG14 TSSOP 14 -40 to 125°C Reel Availability
ZSSC3123AA2T Active PGG14 TSSOP 14 -40 to 125°C Tube Availability
ZSSC3123AI1B Active DICE WAFER 0 -40 to 85°C Wafer Availability
ZSSC3123AI1C Active DICEF WAFER 0 -40 to 85°C Wafer Availability
ZSSC3123AI2R Active PGG14 TSSOP 14 -40 to 85°C Reel Availability
ZSSC3123AI2T Active PGG14 TSSOP 14 -40 to 85°C Tube Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
ZSSC3123 Short-form Datasheet Short Form Datasheet PDF 70 KB Jan 25, 2016
ZSSC3123 Datasheet Datasheet PDF 681 KB Jan 25, 2016
User Guides & Manuals
ZSSC3122/ZSSC3123/ZSC31210 SSC Modular Evaluation Kit Description Manual PDF 708 KB Apr 25, 2016
Application Notes & White Papers
IDT Wafer Dicing Guidelines Application Note PDF 44 KB Apr 16, 2016
ZSC3120-ZSSC3122-23 Calibration Sequence and Calibration DLL Application Note PDF 314 KB Apr 16, 2016
ZSSC3122-23 Application Note - Overvoltage and Reverse Polarity Protection Application Note PDF 92 KB Apr 16, 2016
Other
Sensor Signal Conditioning ICs for Industrial and Consumer Applications Overview PDF 6.88 MB Jul 14, 2017
The IDT Automotive Advantage Overview PDF 3.55 MB May 26, 2017
IDT CAD Altium Libraries for AID Products Rev 20160819 PCB Design Files ZIP 1.20 MB Aug 18, 2016

Software & Tools

Title Other Languages Type Format File Size Date
ZSSC3122 and ZSSC3123 Evaluation Kit Software Rev. 1.4.7.1 Software ZIP 911 KB Apr 6, 2016

Evaluation Boards

Part Number Title Sort ascending
ZSSC3123-MCS Mass Calibration System of ZSSC3123
ZSSC3122-3123KIT Evaluation Kit for ZSSC3122 and ZSSC3123