High power consumption in shutdown

[Sparqqling]

The device has high power consumption when in shutdown, around 0,5mA. It uses SPI and TWI in normal operation but I have implemented the work around according the errata but still the problem persist. Am I missing something here?

    *(uint32_t *)0x40003FFC = 0;
    *(uint32_t *)0x40003FFC;
    *(uint32_t *)0x40003FFC = 1;

    *(uint32_t *)0x40004FFC = 0;
    *(uint32_t *)0x40004FFC;
    *(uint32_t *)0x40004FFC = 1;

    *(uint32_t *)0x40023FFC = 0;
    *(uint32_t *)0x40023FFC;
    *(uint32_t *)0x40023FFC = 1;


    nrf_drv_twi_disable(&m_twi_master);
    nrf_drv_twi_uninit(&m_twi_master);

[Simonr]

Hi

Which of the SPI/TWI are you using in your project? Have you turned the TWI/SPI off and back on using the power registers after it has been disabled, as the workaround suggests? For example uninitializing it like this should suffice:

nrf_drv_twi_uninit(&m_twi);
*(volatile uint32_t *)0x40003FFC = 0;
*(volatile uint32_t *)0x40003FFC;
*(volatile uint32_t *)0x40003FFC = 1; 

Best regards,

Simon

[OPQ]

Hi Simon,

I use TWI0，and also use this workaround but power consumption still about 400uA,it's only 5uA if did not disable twi.

static void i2c_diable_uninit(void)
{
    nrf_drv_twi_disable(&m_twi);

    nrf_drv_twi_uninit(&m_twi);

    nrf_gpio_cfg_default(APS_SCL_PIN);
    nrf_gpio_cfg_default(APS_SDA_PIN);
    nrf_gpio_cfg_default(APS_CS_PIN);
    nrf_gpio_cfg_default(APS_SA0_PIN);


    *(volatile uint32_t *)0x40003FFC = 0;
    *(volatile uint32_t *)0x40003FFC;
    *(volatile uint32_t *)0x40003FFC = 1;
}

[OPQ]

Test in SDK 14.2.

[Simonr]

Hi

Does the workaround only work if you do not disable the TWI first? That seems very strange. This case is nearly 2 years old. Could you please create a case of your own where you describe this issue in detail, and a support engineer will be assigned to it. 

Best regards,

Simon

[OPQ]

Sorry for my bad describe.

Does the workaround only work if you do not disable the TWI first? 

No, I mean if I did not disable and uninit the TWI ,the power consumption will not be abnormal.