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power consumption

energy

I've testing a Raytac mdbt40 module and I'm running the ble uart example (sdk 9.0, gcc debug enabled, no gcc optimization) and no external 32khz crystal

I can scan and connect to the module with my phone so it's running fine.

But I'm getting 18mA (180mV with a 10 ohm resistor in serie with ble module power supply) consumption without anything plugged on the GPIO .... !

Is it possible to get such high value ?

Thanks

  • 0

    I wanted to troubleshout my consumption problem, so I restarted from a blank pcb without any component except the Raytac module All the GPIOS pins are not connected (floating). I just have a mdbt40 module without optional 32khz crystal connected to 3V3 and SWDIO Debug. I haven't also not connected any decoupling caps and .... 1uf caps required on AVcc

    I tried with calling buttons_leds_init with parameter BSP_INIT_NONE but after calling it mcu draws 15mA APP_TIMER_PRESCALER prescaler is set to 0

    I use NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM for soft device as there is no 32khz crystal

  • 0

    Your assumption was correct, I changed the config file enabled led pin separatly and found that I have a shortcut to ground on one pin. Verified on the pcb with my ohmeter ... And on the schematics ! Thanks a lot

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