Configuration; Sleep Mode Configuration; Waking Up From Sleepy Endpoint; Sleep_Rq Input Pin Pulled Low - Radio Bridge RBM101 User Manual

6. C
ONFIGURATION

6.1. Sleep Mode Configuration

Devices can be configured to enter sleep mode during periods of inactivity. If the endpoint
sleeps then it is called a "sleepy" endpoint.

6.1.1. Waking up from Sleepy Endpoint

A sleepy endpoint will enter low power mode when it is not transmitting and will wake up to
one of two conditions:
1. The SLEEP_RQ input pin is pulled low
2. The supervisory message timer expires

6.1.1.1 SLEEP_RQ input pin pulled low

The SLEEP_RQ input pin only functions when the endpoint is put into sleep mode and is left
high to allow the device to sleep. When an event requires a message to be sent, the pin must
be pulled low to take it out of sleep, and once the command has been sent the pin can be
released high. The SLEEP_RQ pin has a pull-up resistor and can be controlled with an open-
drain type output from the host. When the SLEEP_RQ input pin is high, the module will finish
its current transaction prior to re-entering sleep mode.

6.1.1.2 Supervisory Message time expires

The SubGig specification requires a periodic supervisory message to be sent from each
endpoint back to the coordinator. A device in sleep mode will wake up automatically to send
the supervisory message and re-enter sleep mode.
In either of the two cases listed above, the coordinator can send any message it has queued
for the endpoint in the "listen window" (AT command LW) after a message is sent from an
endpoint. The coordinator cannot send messages to sleepy endpoints outside of this window
as they will not be received by an endpoint in sleep mode. For endpoints that are always-on
(sleep mode disabled), the coordinator may send messages any time.
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