WAKE pin is used for a local wake up (LWU). This function is explained further in Section 10.4.4.2 section. The pin is defaulted to bi-directional edge trigger, meaning it recognizes a local wake up (LWU) on either a rising or falling edge of WAKE pin transition. This default value can be change via a SPI command that either configures it as a rising edge only, a falling edge only, a pulse of specific width and timing or a filtered rising or falling edge. This is done by using register 8'h11[7:0]. Pin requires a 22 nF capacitor to ground between the two resistors.