Enabling DC/DC converter nRF51822

[Mindu]

Hi Nordic,

I am trying to enable the DC/DC converter on a QFAAH10 (revision 3). I am using the s130 v2.0.1 SD.

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1. sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);

I write "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);" in my code just 100 ms after "ble_stack_init();", but the consumption does not change when monitoring the advertising TX pulses of my app. Doing debug I've also checked the POWER register on a breakpoint. The value has not changed from 0x00.

2. NRF_POWER->DCDCEN = 1;

I have also tried writing only the "NRF_POWER->DCDCEN = 1;" instruction. No good results neither. I've applied the same actions as point 1 to check the results.

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Could someone tell me what I'm doing wrong?

Thank you in advance.

[Jørgen Holmefjord]

Are you trying this on a custom board or a development kit from Nordic Semiconductor? If it's a custom board, do you have the external components required for DCDC on your board? See chapter 11.3.3 of the nRF51822 Product Specifications, and this thread for more details.

[Mindu]

Thank you for your fast response!! It is a custom board and the external components required are mounted. The problem was that both the output the pin DCC and the input of the radio supply AVDD where attached to the general supply VDD, not between them exclusivily. Silly hardware error!! Thank you.