The device supports multiple power modes described in the sections below. The lower power consumption comes at the cost of longer time for recovery to a running mode.
Figure 5-26 depicts the valid power modes for the device.
Device supports the following power states:
- SoC-OFF: entire device is off by switching off voltage rails externally. External DDR memory may be optionally in Self-Refresh (SR).
- SuspendToRAM: all power rails are OFF except for DDR IO. External DDR memory may be optionally in self-refresh.
- DeepSleep: all processor core power domains are OFF (voltage domain ON). Only WKUP power domains are ON. Some top-level modules that does not have power domains, are ON.
- MCU-ONLY: WKUP and MCU voltage domains are ON, and MAIN SoC side voltage domains are OFF except for 1.8 V IO rail. External DDR memory is in SR optionally.
- Core Power Domain OFF (CPD-OFF): all voltage domains are ON, MAIN SoC side all power domains are OFF. CPD-OFF is alternative to the MCU-ONLY, in case there are restrictions to turn off MAIN SoC side voltage domains.
- Standby: Main processor cores in WFI/WFE, rest of active subsystems idles. .
- Active: main status and control registers are ON, processors and subsystems are ON, based on use cases.
See
Power Estimation Application Note, for more information about power
saved in each low power mode.