PCAP04-BQFM-24

ADCs/DACs - Special Purpose Overview

The ScioSense PCAP04-BQFM-24 is a capacitance-to-digital converter (CDC) featuring an integrated 32-bit DSP for on-chip data post-processing. It supports up to six grounded and three floating capacitors, covering a range from 1 pF to 100 nF with internal references of 1 pF to 31 pF. The device achieves up to 20-bit resolution at sample rates up to 50 kHz, with noise as low as 8 aF at 2.5 Hz. Operating currents are down to 3 μA, supported by supply voltages of 2.1 V to 3.6 V. It includes SPI/I²C interfaces, PDM/PWM outputs, GPIOs, 3 kB ROM, 1 kB NVRAM, and 96 × 32-bit RAM.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 32-bit DSP for linearization and temperature compensation
• Capacitance measurement range of 1 pF to 100 nF with up to 20-bit resolution
• Low power consumption down to 3 μA with 2.1 V to 3.6 V supply
• Supports SPI, I²C, PDM, PWM, and GPIO interfaces

ADCs/DACs - Special Purpose Applications

• Position sensors
• Pressure sensors
• Force sensors
• Proximity sensors
• IoT devices

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'BQFM' against official ScioSense documentation to confirm package type, pinout, and temperature grade (-40°C to 85°C). Ensure compatibility with required interface protocols and memory configurations before procurement.

ADCs/DACs - Special Purpose Selection Notes

Select based on required resolution and sample rate, noting that higher speeds increase current consumption. Consider the need for DSP algorithms for linearization or temperature compensation. Verify voltage levels for SPI/I²C communication and ensure adequate decoupling capacitors for VDD18 and VDD33.

ADCs/DACs - Special Purpose Part Context

The PCAP04 is part of ScioSense's PICOCAP family, designed for high-resolution capacitance sensing. The -Bxxx suffix indicates an industrial temperature range (-40°C to 85°C), while -Axxx denotes automotive range (-40°C to 125°C). The QFN24 package provides a compact solution for space-constrained applications.

ADCs/DACs - Special Purpose Replacement Considerations

No direct public substitutes are listed in the provided datasheet. Evaluate other ScioSense CDCs like the PCAP03 or PCAP05 for similar functionality, ensuring pin compatibility and feature parity.