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LAUNCHXL-CC1352R1: power mode

Cherry Zhou
Mastermind 22235 points
Part Number: LAUNCHXL-CC1352R1

Hi team,

Here's an issue from the customer may need your help:

1) Does the sensor controller enter Standby mode after reading sensor data every 200 ms(referring to Standby mode of sensor controller)?

2) If so, does the MCU automatically go from Idle mode to Standby mode when the sensor controller enters Standby mode(referring to Standby mode of MCU)?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 20407 points

    Hi Cherry, 

    The sensor controller is on the AUX(AON) power domain, so the main CPU can be in the low power mode even when the sensor controller is active. 

    The sensor controller goes into the default power mode if there is no active task that needs to be done. The default power mode is set in the Power and Clock Settings. 

    Regards,

    Sid 

  • 0 in reply to Sid
    TI__Mastermind 22235 points

    Hi Sid,

    Thanks for your help.

    1) As per the technical reference manual, the main CPU cannot enter Standby and can only be in Idle mode when the sensor controller is active.

    Although Idle and Standby are both low-power modes, there is a huge difference in current consumption. So is it possible to have the main CPU go into Standby mode?

    2) In the sensor control studio, the default power mode can only select Active and Low-power. Are you saying that it's not able to enter the StandBy mode of the sensor controller, only low-power mode?

    The customer want to confirm if the StandBy mode for sensor controller is the the power-down mode for AUX? 

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Mastermind 20407 points

    Hi Cherry,

    I apologize for my previous answer. 

    Sid said:
    The sensor controller goes into the default power mode if there is no active task that needs to be done. The default power mode is set in the Power and Clock Settings. 

    The previous answer is incorrect. The correct description of power modes is as follows. 

    The active modes and the low-power modes are two modes in which the sensor controller executes tasks.

    When the sensor controller is not executing the task code, it enters the standby mode.  This is documented in the sensor controller studio documentation.  This is the power down mode. 

    When the sensor controller is executing a task, it can either execute it in the low power mode or in the active mode.

    If sensor controller is executing task in the active mode, the sensor controller clock is derived from the SCLK_HF and does not allow the MCU domain to go into standby mode. 

    If the sensor controller is executing the task in low power mode, the MCU is allowed to go into standby mode. 

    Regards,

    Sid

  • 0 in reply to Sid
    TI__Mastermind 22235 points

    Hi Sid,

    Thanks for clarifications. 

    Assuming the sensor controller executes tasks periodically in the active mode, the MCU in Idle mode:

    a. If the sensor controller enters power down mode when the sensor controller is not executing a task, does the MCU automatically go into Standby mode?

    b. Is application intervention required to execute instructions to have the MCU to go into Standby mode from Idle mode? If so, how?

    c. Or it is not possible for the MCU to switch the MCU's power mode during the period of the sensor controller cycle from active mode to power down mode?

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Mastermind 22235 points

    Hi,

    May I know is there any update?

    Thanks and regards,

    Cherry