ZHCSJK5B January 2018 – November 2019 TCAN4550-Q1
This input pin is used to select the device for a SPI transaction. The pin is active low, so while nCS is high the SDO pin of the device is high impedance allowing a SPI bus to be designed. When nCS is low the SDO driver is activated and communication may be started. The nCS pin is held low for a SPI transaction. A special feature on this device allows the SDO pin to immediately show the Global Fault Flag on a falling edge of nCS.