Cyclic Sleep with Pin Wake-up mode (SM = 5)

Use this mode to wake a sleeping remote device through either the RF interface or by de-asserting SLEEP_RQ for event-driven communications. The cyclic sleep mode works as described previously (Cyclic Sleep mode (SM = 4)) with the addition of a pin-controlled wake-up at the remote device. The SLEEP_RQ pin is level-triggered. The device wakes when a low is detected then set CTS low as soon as it is ready to transmit or receive.

Any activity resets the ST (Time before Sleep) timer, so the device goes back to sleep only after there is no activity for the duration of the timer. Once the device wakes (pin-controlled), it ignores further pin activity. The device transitions back into sleep according to the ST time regardless of the state of the pin.