AD7142ACPZ-500RL7

AD7142 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration for use in systems requiring a novel user input method. It can interface to external capacitance sensors implementing functions such as capacitive buttons, scroll bars, or wheels. The CDC has 14 inputs channelled through a switch matrix to a 16bit, 250KHz sigma-delta (∑-∆) capacitance-to-digital converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup. It is used in applications such as personal music and multimedia players, cell phones, digital still cameras, smart hand-held devices, television, A/V, and remote controls, gaming consoles.

• Programmable capacitance-to-digital converter, SPI interface
• 36ms update rate (at maximum sequence length), better than 1fF resolution
• 14 capacitance sensor input channels, no external RC tuning components required
• Automatic conversion sequencer, on-chip automatic calibration logic
• Automatic compensation for environmental changes
• On-chip RAM to store calibration data, separate VDRIVE level for serial interface
• Interrupt output and GPIO, supply voltage range from 2.6V to 3.6V
• Update rate is 36.86ms typical at (AVCC, DVCC = 2.6V to 3.6V)
• Operating temperature is -40°C to +85°C
• Package style is 32-lead LFCSP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party