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PCA9704
18 V tolerant SPI 8-bit GPI with maskable INT
Rev. 1 — 10 December 2015
Product data sheet
1. General description
The PCA9704 is a 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 but allows selected inputs to not generate interrupts using the interrupt masking feature. The input level is recognized as a HIGH when it is greater than 0.8 VDD and as a LOW when it is less than 0.55 VDD (minimum LOW threshold of 2.5 V at 5 V node). The PCA9704 can monitor up to 8 switch inputs.
The falling edge of the CS pin samples the input port status and clears the interrupt.
PCA9704 Datasheet
