nrf52832-dk(PCA10040) external power and gpio

RE: nrf52832-dk(PCA10040) external power and gpio

Simonr — Mon, 06 Dec 2021 10:18:56 GMT

Glad to hear you figured it out! Yes, it seems reasonable that the voltage drop is what caused the DK to not power up properly when supplied with 1.8V. Let me know if we can close this case or if you have any further questions.

Best regards,

Simon

RE: nrf52832-dk(PCA10040) external power and gpio

akckwang — Thu, 02 Dec 2021 00:58:29 GMT

Hi Simonr,

I raise the power supply to ~2.4v then gpios working normally,

The manual of nrf52832-dk mentioned this

" The reverse voltage protection diodes will add a voltage drop to the supply voltage of the circuit. To avoid
this voltage drop, the diodes can be bypassed by shorting one or more solder bridges."

I was set power supply to 1.8v and I didn't wire SB12,
so the voltage became too low to enable nrf52832-dk, I guess...

Whatever I can control gpio with external power source now.

Thanks~

RE: nrf52832-dk(PCA10040) external power and gpio

akckwang — Wed, 01 Dec 2021 00:52:34 GMT

Hi Simonr,

The power source is a power supply GW INSTEK GPS-3030D, and yes I connected only this one power source, no usb or battery,
I just call nrf_gpio_cfg_output(xxx), nrf_gpio_pin_set(xxx) to control gpio then measuring voltage by digital multimeter

Thanks~

RE: nrf52832-dk(PCA10040) external power and gpio

Simonr — Tue, 30 Nov 2021 12:33:59 GMT

What kind of power source is this exactly, and have you connected it correctly to P21? Please note that you should only connect one power source at the time. The GPIOs you say are working are the reset pin (P0.21), and the default GPIOs used for UART (P0.05-P0.08). How exactly are you "controlling" these pins?

Best regards,

Simon