KW36 - Can I use watchdog in low power mode?

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KW36 - Can I use watchdog in low power mode?

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jictannu
Contributor III

In MKW36A512RM, watchdog does not work in LLSx & VLLSx.

jictannu_0-1602298825392.png

There are 8 DeepSleep mode in PWR_Configuration.h, looks like the watchdog only works in mode 6(MCU in STOP), But Mode 6 has a higher power consumption. Can I use watchdog in low power mode?

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nxf56274
NXP TechSupport
NXP TechSupport

Hi,

The code do not realize. You have to add code by yourself. Actually, I am not sure if it is good to add watchdog into the low power mode. 

Have a great day,
TIC

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nxf56274
NXP TechSupport
NXP TechSupport

Hi,

If you choose 1khz source clock for watchdog, you can use watchdog in vlps mode.

3.PNG

Have a great day,
TIC

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jictannu
Contributor III

Hi nxf56274. How can I select vlps mode? In PWR_Configuration.h, no deepsleep mode is used in vlps mode.

 

/*-----------------------------------------------------------------------------
 * The way that DeepSleep mode are handled. Following possibilities exist:
 *******************************************************************************
 *
 *******************************************************************************
 *   1: MCU/Radio low power modes: This is a BLE DSM specific low power mode. It requires cPWR_BLE_LL_Enable TRUE.
 *        MCU in LLS3 mode.
 *        BLE_LL in DSM.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        BLE_LL wake up interrupt(BLE_LL reference clock reaches wake up instance register)  using LLWU module.
 *          - BTE_LL wakeup timeout: controlled by the BLE stack(SoC must be awake before next BLE action).
 *          - BTE_LL reference clock source:   32Khz oscillator
 *          - BTE_LL reference clock resolution:     625us
 *        LPTMR wakeup timeout: cPWR_DeepSleepDurationMs by default. Use PWR_SetDeepSleepTimeInMs
 *                                  to change it at run time. Maximum timeout is 65535000 ms (18.2 h).
 *          - LPTMR clock source:   32Khz oscillator
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *******************************************************************************
 *******************************************************************************
 *   2: MCU/Radio low power modes: This is a non DSM general purpose low power mode.
 *        MCU in LLS2 mode.
 *        BLE_LL must be idle or cPWR_BLE_LL_Enable FALSE.
 *        GEN_LL must be idle or cPWR_GENFSK_LL_Enable FALSE.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        DCDC PowerSwitch - available in buck mode only.
 *        LPTMR interrupt using LLWU module
 *          - LPTMR wakeup timeout: cPWR_DeepSleepDurationMs by default. Use PWR_SetDeepSleepTimeInMs
 *                                  to change it at run time. Maximum timeout is 65535000 ms (18.2 h).
 *          - LPTMR clock source:   32Khz oscillator
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *      RAM retention:
 *          - 16k Ram retention (0x20000000- 0x20003fff) if cPWR_RAM2_EnabledInLLS2 = 0(default)
 *          - 32k Ram retention (0x20000000- 0x20007fff) if cPWR_RAM2_EnabledInLLS2 = 1
 *******************************************************************************
 *******************************************************************************
 *   3: MCU/Radio low power modes: This is a non DSM general purpose low power mode.
 *        MCU in LLS3 mode.
 *        BLE_LL must be idle or cPWR_BLE_LL_Enable FALSE.
 *        GEN_LL must be idle or cPWR_GENFSK_LL_Enable FALSE.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        DCDC PowerSwitch - available in buck mode only.
 *        LPTMR interrupt using LLWU module
 *          - LPTMR wakeup timeout: cPWR_DeepSleepDurationMs by default. Use PWR_SetDeepSleepTimeInMs
 *                                  to change it at run time. Maximum timeout is 65535000 ms (18.2 h).
 *          - LPTMR clock source:   32Khz oscillator
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *******************************************************************************
 *******************************************************************************
 *   4: MCU/Radio low power modes: This is a non DSM general purpose low power mode.
 *        BLE_LL must be idle or cPWR_BLE_LL_Enable FALSE.
 *        GEN_LL must be idle or cPWR_GENFSK_LL_Enable FALSE.
 *        MCU in VLLS0/1 mode(VLLS0 if DCDC bypassed/ VLLS1 otherwise ).
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        DCDC PowerSwitch - available in buck mode only.
 *******************************************************************************
 *******************************************************************************
 *   5: MCU/Radio low power modes: This is a non DSM general purpose low power mode.
 *        MCU in VLLS2 (16k Ram retention (0x20000000- 0x20003fff)).
 *        BLE_LL must be idle or cPWR_BLE_LL_Enable FALSE.
 *        GEN_LL must be idle or cPWR_GENFSK_LL_Enable FALSE.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        DCDC PowerSwitch - available in buck mode only.
 *******************************************************************************
 *******************************************************************************
 *   6: MCU/Radio low power modes:
 *        MCU in STOP.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        DCDC PowerSwitch - available in buck mode only.
 *        LPTMR wakeup timeout: cPWR_DeepSleepDurationMs by default. Use PWR_SetDeepSleepTimeInMs
 *                                  to change it at run time. Maximum timeout is 65535000 ms (18.2 h).
 *          - LPTMR clock source:   32Khz oscillator
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *        Any Radio interrupt
 *        UART
 *******************************************************************************
 *******************************************************************************
 *   7: MCU/Radio low power modes: This is a GENFSK DSM specific low power mode. It requires cPWR_GENFSK_LL_Enable TRUE.
 *        MCU in LLS3 mode.
 *        GENFSK_LL in DSM.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        GENFSK_LL wake up interrupt(GENFSK_LL reference clock reaches wake up instance register) using LLWU module.
 *          - GENFSK_LL reference clock source:   32Khz oscillator
 *          - GENFSK_LL reference clock resolution:     ~30.5us
 *        LPTMR wakeup timeout: cPWR_DeepSleepDurationMs by default. Use PWR_SetDeepSleepTimeInMs
 *                                  to change it at run time. Maximum timeout is 65535000 ms (18.2 h).
 *          - LPTMR clock source:   32Khz oscillator
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *******************************************************************************
 *******************************************************************************
 *   8: MCU/Radio low power modes: This is a BLE DSM specific low power mode. It requires cPWR_BLE_LL_Enable TRUE.
 *        MCU in VLLS2/3 mode.
 *        BLE_LL in DSM.
 *      Wakeup sources:
 *        GPIO (push button) interrupt using LLWU module(SW2(PTA18),SW3(PTA19)).
 *        BLE_LL wake up interrupt(BLE_LL reference clock reaches wake up instance register)  using LLWU module.
 *          - BTE_LL wakeup timeout: controlled by the BLE stack(SoC must be awake before next BLE action).
 *          - BTE_LL reference clock source:   32Khz oscillator
 *          - BTE_LL reference clock resolution:     625us
 *        LPTMR wakeup timeout: cPWR_DeepSleepDurationMs by default. Use PWR_SetDeepSleepTimeInMs
 *                                  to change it at run time. Maximum timeout is 65535000 ms (18.2 h).
 *          - LPTMR clock source:   32Khz oscillator
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *          - LPTMR resolution:     modified at run time to meet timeout value.
 *      RAM retention:
 *          - 16k Ram retention (0x20000000- 0x20003fff) if cPWR_RAM2_EnabledInLLS2 = 0(default)
 *          - 32k Ram retention (0x20000000- 0x20007fff) if cPWR_RAM2_EnabledInLLS2 = 1
 *          - Full Ram retention in VLLS3
 *******************************************************************************
 */

 

 

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