nrf52840 power consumption with increased voltage for peripherals

[Felixx]

We are using nrf52840 USB dongle to get PIR sensor readings and send measurements over the Bluetooth Mesh
Schematics are following:

We increased power for peripherals to 3.3v using following code:
const uint32_t REGOUT0     __attribute__ ((section(".uicr_regout0")))
                           __attribute__ ((used))
                           = UICR_REGOUT0_VOUT_3V3 | ~UICR_REGOUT0_VOUT_Msk;
                           
Issue is that this change increased power idle consumption from 50μa to 550μa.

Is there any way to increase external peripherals supply voltage without increase of idle consumption?

[Andreas]

Hi,

 

Is this with the PIR sensor connected or not, if so what is it if you disconnect the PIR sensor?

 

Best regards,

Andreas

[Felixx]

Without PIR 514 μa

[Andreas]

Hi,

 

And the GPIOs, are any of them initalized?

 

Best regards,

Andreas

[Felixx]

Buttons:

BSP_BUTTON_0  <  BUTTON_1  <  NRF_GPIO_PIN_MAP(1,6)

PIR:

PIR_SENSOR_GPIO_NR  <  NRF_GPIO_PIN_MAP(1,15)

LEDs:

m_leds_list[]  <  LEDS_LIST  <
    LED_1  <  LED1_G  <  NRF_GPIO_PIN_MAP(0,6)
    LED_2  <  LED2_R  <  NRF_GPIO_PIN_MAP(0,8)
    LED_3  <  LED2_G  <  NRF_GPIO_PIN_MAP(1,9)
    LED_4  <  LED2_B  <  NRF_GPIO_PIN_MAP(0,12)

NOTE. Power for peripherals was increased, because PIR requires at least 2.8v to operate

[haakonsh]

Hey Felixx,

None of your button or led gpios are available on the dongle, remap them to pins that are available and check the current consumption again. 

What instrument do you use to measure the current consumption? 

How did you measure the current consumption?