Features
- Maximum target input capacitance: 260pF
- Sampling rates as fast as 0.7ms at 8-bit, 1.6ms at 10-bit, 5.0ms at 12-bit, 18.5ms at 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 at -40°C to 125°C, 3V, 5V, Vsupply ±10% (see data sheet section 1.3 for restrictions)
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 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.
Parameters
| Attributes | Value |
|---|---|
| Function | Capacitive SSC |
| Automotive Qual. | No |
| Supply Voltage (V) | - |
| Input Type | Single-capacitor |
| Interface | I2C, SPI, PDM, Two Alarms |
| Adj. Analog Gain | - , - , - |
| Resolution (bits) | 14 |
| Sample Rate Max (KHz) | 1 |
| Temp. Range (°C) | -40 to 85°C, -40 to 125°C |
Application Block Diagrams
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