PCAP02 Capacitance-to-Digital Converter
Capacitance-to-Digital Converter with Integrated Signal Processor
PCAP02 is a capacitance-to-digital converter with a digital signal processor. Its front end is based on ScioSense patented PICOCAP measuring principle.
This conversion principle provides great resolution with conversion times as short as 2 µs. Users benefit from exceptional versatility in terms of power usage, resolution, and speed.
The PCAP02 works with both grounded and floating single and differential sensors. Ground capacitors mitigate for stray capacitance inside the chip. Floating capacitors compensate for both internal and exterior stray capacitances. A pre-charge cycle increases the utility of MEMS sensors while simultaneously providing short-circuit safety. Temperature can be sensed using either internal or external thermistors (platinum or others). The chip requires firmware to process the raw measurement data and transform it into appropriate results.
ScioSense offer two versions of open-source firmware, one for pure compensates capacitance ratios and one for fully linearized and temperature compensated results.
PicoCap: Capacitance Measurement
KEY FEATURES
- Wide Input Range (fF to nF)
- Low Noise (15 aF rms)
- High Update Rate up to 500 kHz
- Low Current Consumption down to 2 uA
- Internal Signal Processor
KEY BENEFITS
- Enables Platform Designs (one part – different configurations)
- Enables Compact Designs Due to Internal Signal Processor
- Allows for Low Power Designs (Example, wireless applications)
- Enables Multi-Channel Designs (up to 8 sensors)
PCAP02 PRODUCT FACTS
| Channels | 8 |
| Noise [aF@10pF] |
15 |
| Max. Rate [SPS] |
500000 |
| Operating Supply Range [V] |
2.1 to 3.6 |
| Interface | SPI, I2C, PDM, PWM |
| CPU | 48-bit |
| Memory | 4k OTP |
| GPIO | 6 |
| Ambient Temperature Range [°C] | -40°C to +125°C |
| Package | QFN32 |