QT300

www.DataSheet4U.com LQ CAPACITANCE TO DIGITAL CONVERTER QT300 Capacitance to Digital Converter (CDC) IC Direct-to-digital conversion, 16 bits Log response: Wide dynamic range Outputs raw data to a host device Single wire UART interface Master or Slave mode SPI interface Programmable clock speed Turns objects into intrinsic touch sensors One external sample capacitor to control gain Multiple QT300’s possible on one SPI bus Vss 4 DRDY SCK SNS1 1 8 Vdd SDO REQ / 1W SNS2 QT300 2 3 7 6 5 The QT300 charge-transfer (“QT’”) IC is a self-contained Capacitance-toDigital-Converter (CDC) capable of detecting femotofarad level changes in capacitance. While designed primarily for instrumentation applications, it can be used also for touch control applications where signal processing is best handled by a host MCU. Primary applications include fluid level sensors, distance sensors, transducer ‘amplifiers’ for pressure and humidity sensing functions, material detectors, and other uses requiring quantified capacitance data. APPLICATIONS Fluid level sensors Prox sensors Moisture detection Position sensing Transducer driver Material sensors Unlike other Quantum products, the QT300 does not process its acquired data. Its only result is raw, unprocessed binary data which can be transmitted to a host via either a bidirectional SPI interface or a simple polled single wire UART type interface. This allows the designer to treat the device as a capacitance-to-digital-converter (CDC) for mea...