The AD7143ACPZ features an integrated capacitor-digital with on-chip environmental calibrationconverter（CDC
The AD7143 is an integrated capacitor-to-digital converter (CDC) with on-chip environmental calibration for systems requiring a new user input method. The AD7143 interfaces with external capacitive sensors to enable functions such as capacitive buttons, scroll bars, and scroll wheels.
The CDC has eight input channels connected to a 16-bit, 250 kHz sigma-delta (Σ-Δ) capacitor-to-digital converter through a switch matrix. The CDC senses changes in capacitance from external sensors and uses this information to log sensor activation events. External sensors can be configured as a series of buttons, a scroll bar or scroll wheel, or a combination of sensors. By programming the registers, the user has full control over the CDC settings. High-resolution sensors require software to run on the host processor.
The AD7143 has on-chip calibration logic to handle changes in the surrounding environment. When the sensor is idle, the calibration sequence is automatically performed at continuous intervals, thus avoiding false touches or touch unrecorded events from external sensors due to environmental changes.
The AD7143 comes with an I2
C-compatible serial interface and one support I2
A separate VDRIVE pin for the C serial interface, which operates from 1.65 V to 3.6 V.
The AD7143 is available in a 16-lead 4 mm × 4 mm LFCSP-VQ package and operates from 2.6 V to 3.6 V. Operating power consumption is less than 1 mA and can be reduced to 50 μA in low-power mode (400 ms conversion interval).
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- Personal music player and multimedia player
- cell phone
- Digital cameras
- Smart handheld devices
- TV, A/V and remote control
- Game