AD7143ACPZ Integrated capacitive-to-digital converter (CDC) with on-chip environmental calibration
The AD7143 is an integrated capacitive-to-digital converter (CDC) with on-chip environmental calibration for use in systems that require a new type of 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 (Sigma-Δ) capacitive-to-digital converter via a switching matrix. The CDC is able to sense changes in the capacitance of external sensors and use this information to record sensor activation events. The external sensor can be configured as a series of buttons, as a scroll bar or scroll wheel, or as 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 is equipped with on-chip calibration logic to handle changes in the surrounding environment. When the sensor is idle, the calibration sequence is automatically executed at continuous intervals to avoid accidental touches of external sensors or unrecorded touches due to environmental changes.
The AD7143 is equipped with an I2C-compatible serial interface and a stand-alone VDRIVE pin that supports an I2C serial interface and operates from 1.65 V to 3.6 V.
The AD7143 is available in a 16-pin 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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- 个人音乐播放器和多媒体播放器
- 手机
- 数码相机
- 智能型手持设备
- 电视、A/V和遥控
- 游戏机