GR551x Sleep Mode and Power Consumption Measurement Application Note
●Purpose:
This document introduces the Sleep Mode and example application details of GR551x SoCs, to help users configure the Sleep Mode.
●Operating Modes：
GR551x SoCs operate in three modes: Active, Idle, and Sleep.
■Active ModeIn this mode, the CPU of GR551x SoCs runs at full speed; users can configure and use peripherals on demand.Typical scenarios in this mode are described below:
◆The MCU Subsystem (including ARM processors, SRAM, and peripherals) remains in standby or active state.
◆The Bluetooth Subsystem (including RF Transceiver and Communication Core) remains in standby or activestate.
◆The PMU Subsystem (including DC/DC, LDO, and RTC) remains in active state.
■Idle ModeThe Idle Mode is configured by Wait For Interrupt/Wait For Event (WFI/WFE) command built in ARM processors.When this command is called, the PC pointer stops at the address of the WFI/WFE command; when an IRQor event occurs in the system and CPU wakes up, the PC pointer points to the next command and continuesimplementing commands. Bluetooth tasks of GR551x SoCs are implemented based on interrupts. When theGR551x SoC is implementing Bluetooth tasks, users can configure the system to Idle Mode to reduce the powerconsumption; in the case of no Bluetooth tasks to be implemented, switch the Bluetooth Subsystem to POWEROFF Mode to further reduce power consumption.
■Sleep ModeWhen there are no tasks to be processed on GR551x SoCs, users can configure the system to WFI/WFE state; youcan also configure it to Sleep Mode to further reduce the power consumption. In this mode, the XTAL32M clockstops running, and the following modules are powered off:
◆The MCU Subsystem (except for Retention SRAM)
◆The Bluetooth SubsystemIn Sleep Mode, only Always-on (AON) Domain in the system is powered on, to prevent data stored in RetentionSRAM from getting lost, and the modules with wakeup function are also powered on, including Bluetooth LowEnergy (Bluetooth LE) Timer, Sleep Timer, Real Time Calendar, and AON GPIO.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2020-09-25 |
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Version: 1.7 |
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1.7 MB |
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