Sleep modes

Sleep modes enable the device to enter states of low-power consumption when not in use. In order to enter Sleep mode, one of the following conditions must be met (in addition to the device having a non-zero SM parameter value):

SLEEP_RQ/DTR (TH pin 9/SMT pin 10) is asserted and the device is in a pin sleep mode (SM = 1, or 5)
The device is idle (no data transmission or reception) for the amount of time defined by the ST (Time before Sleep) parameter.

Note ST is only active when SM = 4 or 5.

The following table shows the sleep mode configurations.

Sleep mode	Description
SM 0	No sleep
SM 1	Pin sleep
SM 4	Cyclic sleep
SM 5	Cyclic sleep with pin wake-up