[Zentrum Mikroelektronik Dresden AG]

Brief Description
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 non-volatile EEPROM.

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% FSO@ -40 to 125°C, 3V, 5V, Vsupply ±10%

Benefits
• Minimized calibration costs: no laser trimming,
   one-pass calibration using a digital interface
• Wide capacitance range to support a broad
   portfolio of different sensor elements
• Excellent for low-power battery applications

Interfaces
• I²C™ or SPI interface—easy connection to a µC
• PDM outputs (Filtered Analog Ratiometric) for
   both capacitance and temperature
• Up to two alarms that can act as full push-pull or
   open-drain switches

Physical Characteristics
• Supply voltage: 2.3V to 5.5V
• Typical current consumption 650μA down to
   60μA depending on configuration
• Typical Sleep Mode current: ≤ 1μA at 85°C
• Operation temperature: –40°C to +125°C
• Die or TSSOP14 package

Available Support
• ZSSC3123 SSC Evaluation Kit available: SSC
   Evaluation Board, samples, software,
   documentation.
• Support for industrial mass calibration available.
• Quick circuit customization option for large
   production volumes.