The AD7879ACPZ-500R7 is a 12-bit successive approximation Analog-to-digital Converter (ADC) with a synchronous serial interface and low on-resistance switches for driving 4-wire resistive touch screens. The device includes a shutdown mode that reduces current consumption to less than 6μA. To reduce the effects of noise from LCDs and other sources, the converter contains a preprocessing block. The preprocessing function consists of a median filter and an averaging filter. The combination of these two filters provides a more robust solution, discarding the spurious noise in the signal and keeping only the data of interest. The size of both filters is programmable. Other user-programmable conversion controls include variable acquisition time and first conversion delay, up to 16 averages can be taken per conversion. The converter can run in slave mode or standalone mode, using an automatic conversion sequencer and timer.
- Median and averaging filter to reduce noise
- Automatic conversion sequencer and timer
- User-programmable conversion parameters
- Auxiliary analog input/battery monitor
- Interrupt outputs (INT, PENIRQ)
- Touch-pressure measurement
- Wake-up on touch function
便携式器材, 自动化与过程控制, 医用
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