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Documentation > GR533x Power Consumption Measurement User Guide/ Overview/ Power Consumption Modes Copy URL

Power Consumption Modes

GR533x SoCs operate in four modes, as described below.

  • Active: The CPU operates at its full speed.
    • The MCU subsystem (including ARM processor, SRAM, and peripherals) remains in standby or active status.
    • The Bluetooth subsystem (including RF Transceiver and Communication Core) remains in standby or active status.
    • The PMU subsystem (including DC-DC, LDO, and real-time counter) remains in active status.
  • Idle: The CPU is in idle status with no program running.
  • Sleep: HFXO_32M stops running; the MCU subsystem (except Retention SRAM) and the Bluetooth subsystem are powered off. Only the always-on (AON) domain is powered on, to prevent data in the Retention SRAM from being lost, and to power the modules/IOs that can wake up the system from sleep (including Bluetooth LE timer, sleep timer, real time counter, and AON GPIOs).
  • Ultra deep sleep: the deepest power saving mode that the system can enter. In this mode, all modules (including Retention SRAM) except the AON domain are powered off. The AON domain is powered on. After wake-up by an AON GPIO or the sleep timer, programs will enter the cold boot process.

The system switches between the power modes as shown in the figure below.

Figure 1 Power mode switching mechanism

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