Pin sleep

Pin sleep allows the module to sleep and wake according to the state of the DTR/SLEEP_RQ pin (Micro pin 9/SMT pin 10/TH pin 9). Pin sleep mode is enabled by setting the SM command to 1.

When the device asserts (high) DTR/SLEEP_RQ, it finishes any transmit or receive operations for the current packet that is processing and enters a low power state. For example, if the device has not joined a network and SLEEP_RQ is asserted (high), it sleeps once the current join attempt completes (that is, when scanning for a valid network completes). The device wakes from pin sleep when the SLEEP_RQ pin is de-asserted (low).

Devices with SPI functionality can use the SPI_SSEL pin instead of D8 for pin sleep control. If D8 = 0 and P7 = 1 , SPI_ SSEL takes the place of DTR/SLEEP_RQ and functions as described above. In order to use SPI_ SSEL for sleep control while communicating on the UART, the other SPI pins must be disabled (set P5 , P6 , and P8 to 0 ). See Low power operation for information on using SPI_SSEL for sleep control while communicating over SPI.