Does nRF52833 Support up to 5.5Volt supply?

Hi Sir,

We are planning for a Hardware deign by using nRF52833 and we are stuck on what should be suitable the supply voltage. In some case the data sheet showing that it is up to max 5.5voltage and max 3.6 voltage.

In our case we wanted to power up it with a Li-ion battery that will go up to  4.2 volt. So, kindly help us to decide suitable supply voltage for the nRF52833 chip, and does it support up to 5.5 volt supply? if yes , suggest us a suitable reference schematic for the same. 

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  • Hi,

         Can I connect the 3.3V GPS module's Rx and Tx with MCU pins via 1k in series?

    I doubt that during reset the VDD pin will be at 1.8V and it will cause the issue. Please guide.

    Also how to write REGOUT0 register?

  • The register is retained, so once set it will not be reset to 1.8V without erasing the UICR register.

    To set the register you can either do this in the application or during program by writing to the register using the programmer.

    Here is how we do it for the nRF52840 dongle, which uses  high voltage mode with REG0 configured for 3.0V output:

    #include <hal/nrf_power.h>
    
    if ((nrf_power_mainregstatus_get(NRF_POWER) ==
         NRF_POWER_MAINREGSTATUS_HIGH) &&
        ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) ==
         (UICR_REGOUT0_VOUT_DEFAULT << UICR_REGOUT0_VOUT_Pos))) {
    
    	NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
    	while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {
    		;
    	}
    
    	NRF_UICR->REGOUT0 =
    	    (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |
    	    (UICR_REGOUT0_VOUT_3V0 << UICR_REGOUT0_VOUT_Pos);
    
    	NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
    	while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {
    		;
    	}
    
    	/* a reset is required for changes to take effect */
    	NVIC_SystemReset();

     

    To set it to 3.3V using the programmer you can use this command:

    nrfjprog --memwr 0x10001304 --val 5

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