PCap04 Capacitance-to-Digital Converter

Low-power CDC with 32-bit DSP and guarding


  • Up to 6 capacitors in grounded mode
  • Up to 3 capacitors in floating mode
  • Internal reference 1 to 31pF
  • Integrated guarding operational amplifier


  • High flexibility: Easy adaption to various applications - ultra low power, high resolution or high speed - just by configuration
  • High resolution or high speed
  • On-chip DSP for sensor algorithms, signal post-processing including linearization and temperature compensation
  • On-chip and external temperature measurement capability

Product parameters

Channels 6
Noise [aF@10pF] 8
Max. Rate [SPS] 50000
Operating Supply Range [V] 3.0 to 3.6
Interface SPI, I²C, PDM, PWM
CPU 32-bit
Memory 4k NVRAM
Ambient Temperature Range [°C]
Ambient Temperature Range [°C] -40 to +125
Package QFN24

General Description

PCap04 is a capacitance-to-digital converter (CDC) with integrated digital signal processor (DSP) for on-chip data post-processing. Its front end is based on ams PICOCAP principle. This conversion principle offers outstanding flexibility with respect to power consumption, resolution and speed. Further, PCap04 covers a wide capacitance input range from a few femtofarads up to several hundreds of nanofarads. It is easy to configure the PCap04 for different capacitance measurement tasks, i.e. single as well as differential sensors in both, grounded or floating connection. The on-chip DSP allows to implement sensor algorithms like linearization and temperature compensation, with data output in a digital (SPI or IIC) or analog (PDM/PWM) way.

This product suits for the following applications:

  • Position sensors
  • Pressure sensors
  • Force sensors
  • Proximity sensors
  • Acceleration sensors
  • Inclination sensors
  • Humidity sensors
  • Dewpoint sensors
  • Tilt sensors
  • Angle sensors
  • Wireless applications
  • Level sensors


Title Category Headline Buy
PCAP04EvalKit Application Board Evaluation Kit for PCAP04

Technical Documents

Type Description Language
Datasheet Document version 1-03 English
Application Note Fill Level Sensing English
Application Note Linearization English
Errata Sheet Errata Sheet PCAP04 English

Environmental Documents

Type Description Language
RoHS Certificate RoHS Certificate PCap04 English

Other Information

Type Description Language
Block Diagram PCap04 Block Diagram English
Factsheet Configurable Capacitive Frontend English
Factsheet ICs for Capacitive Sensing Applications English

Ownership of this product has moved to Sciosense

Please be informed that this product is now owned by Sciosense B.V., a joint venture of ams AG and Wise Road Capital, effective January 13th, 2020.

ScioSense Environmental Sensors