Power saving within System ON is driven by the LTE modem state and is enabled by host configuration. Once enabled, no per-transaction host action is required.
-
Power saving is enabled with
AT%MODULECFG="autoPowerSave",1. The setting can be changed only while the current sleep mode is System ON IDLE, meaning not while the module is already in power-saving sleep, and it takes effect when the radio is activated. The setting is not retained across a reset and must be re-applied.
-
With power saving enabled, the module enters System ON power-saving sleep whenever the modem is in iDRX, eDRX, or PSM. It returns to full System ON automatically when the modem detaches, when the radio is turned off, or when there is data to send or receive.
-
With power saving disabled, the module remains in System ON without sleeping. Disabled is the default at boot, and is the correct configuration for RF testing, provisioning, and any period in which peripheral or general-purpose I/O functionality must stay available.
-
Power saving does not engage before the modem attaches. During network search, registration, and attach retries the module draws its full System ON current. Applications operating in marginal coverage should budget for this.
AT%MODULECFG="slpWaitTime" sets the time in ms for which the module stays
awake after each wake-up, default 1 000 ms. Reduce this value to lower the average current on
short duty cycles.