PCAP04-AQFM-24 ScioSense

PCap04 Capacitance-to-Digital Converter PCap04 is a capacitance-to-digital converter (CDC) with General Description 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. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of PCap04, Capacitance-to-Digital Converter are listed below: Figure 1: Added Value of Using PCap04 Benefits Features Up to 6 capacitors grounded, 3 capacitors floating High flexibility: Easy adaption to various Capacitance range 1pF to 100nF applications - ultra low power, high resolution or Internal reference 1pF to 31pF high speed - just by configuration Integrated guard driver Up to 8aF at 2.5Hz and 10pF base capacitance High resolution or high speed Up to 50kHz sample rate Up to 20-bit resolution 32-bit DSP 3k ROM code, 1k NVRAM On-chip DSP for sensor algorithms, signal post-processing including linearization and 96 x 32 bit RAM temperature compensation SPI / IIC interface PDM / PWM outputs, GPIO Supply voltage 2.1/3.0V to 3.6V Operating current down to 3A On-chip and external temperature measurement PCap04-Bxxx -40C to 85C capability PCap04-Axxx -40C to 125C QFN24 or die (1.588mm x 1.46mm) ams Datasheet Page 1 v1-03 2018-Apr-04 Document FeedbackPC ap 04 Gene ral Des c rip t ion Applications MEMS Sensors The PCap04 applications include: Position sensors Pressure sensors Force sensors Proximity sensor Acceleration sensors Inclination sensors Humidity sensors Dewpoint sensors Tilt sensors Angle sensors Wireless applications Level sensors Block Diagram The functional blocks of this device are shown below: Figure 2: Functional Blocks of PCap04 VDD33 VDD18 GND DSP IO PG5 Voltage regulator PC0 PG4 PDM PC1 data PG3 Data Memory PC2 rad data 96 x 32 bit RAM PG2 PC3 CDC Result Registers rad GPI PC4 MISO PG1 O c add ptr DSP PC5 MUX Internal: SSN PG0 SIF PC6 128 x 32bit start SPI / XROM SCK SCL I2C opcode ~ 3000 x PCAUX / stop tdc start value 8bit GUARD OUT MOSI SDA pc tdc stop value TDC IIC EN NVRAM start tdc trig dsp PTOUT 1024x 8bit stop PT0REF RDC PT1 internal r add ptr Boot clocks Config Register Page 2 ams Datasheet Document Feedback v1-03 2018-Apr-04