FEATURES
Programmable capacitance-to-digital converter (CDC) Femtofarad (fF) resolution 8 capacitance sensor inputs 25 ms update rate, all 8 sensor inputs No external RC components required Automatic conversion sequencer On-chip automatic calibration logic Automatic compensation for environmental changes Automatic adaptive threshold and sensitivity levels Register map compatible with AD7143 On-chip RAM to store calibration data I2C-compatible serial interface Separate VDRIVE level for serial interface Interrupt output 16-lead, 4 mm × 4 mm LFCSP 2.6 V to 3.3 V supply voltage Low operating current Full power mode: 1 mA Low power mode: 21.5 μA FUNCTIONAL BLOCK DIAGRAM ACSHIELD VCC 5 8 GND 7 BIAS 6 AD7148 CIN0 13 CIN1 14 CIN2 15 CIN3 16 CIN4 CIN5 CIN6 CIN7 1 2 3 4 EXCITATION SOURCE CALIBRATION RAM 16-BIT Σ-Δ CDC POWER-ON RESET LOGIC SWITCH MATRIX CALIBRATION ENGINE CONTROL AND DATA REGISTERS SERIAL INTERFACE AND CONTROL LOGIC INTERRUPT AND GPIO LOGIC 9 10 11 12 VDRIVE SDA SCLK INT APPLICAT...
Analog Devices
