PCA9701; PCA9702 18 V tolerant SPI 16-bit/8-bit GPI with INT Rev.
7 — 26 September 2014 Product data sheet 1.
General description The PCA9701/PCA9702 are low power 18 V tolerant SPI General Purpose Input (GPI) shift register designed to monitor the status of switch inputs.
It generates an interrupt when one or more of the switch inputs change state.
The input level is recognized as a HIGH when it is greater than 0.
7  VDD and as a LOW when it is less than 0.
4  VDD (minimum threshold of 2 V at 5 V node).
The PCA9701 can monitor up to 16 switch inputs and the PCA9702 can monitor up to 8 switch inputs.
The falling edge of the CS pin samples the input port status and clears the interrupt.
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