ZHCSJK5C January 2018 – October 2020 TCAN4550-Q1
The WAKE pin is used for a high voltage device local wake up (LWU). This function is explained further in Section 220.127.116.11 section. The pin is defaulted to bi-directional edge trigger, meaning it recognizes a LWU on either a rising or falling edge of WAKE pin transition. This default value can be changed via a SPI command that disables the function, make it a rising edge only or a falling edge only. This is done by using register 16'h0800[31:30]. Pin requires a 10 nF capacitor to ground for improved transient immunity in applications that route WAKE externally. If local wake-up functionality is not needed in the end application, WAKE can be tied directly to VSUP or GND.