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Is my dev board ( pca10040) broken?

bryanhsieh

Hi Everyone,

Recently I have been trying to measure the current consumption from the dev board. I have set up the board as instructed by cutting SB9 and soldering SB11 and SB12. (swapping between external and battery supply). But when I tried to measure current I noticed something odd, if I don't short P22, no power should be delivered to nrf52832 and this is indeed the case. But as soon as I short P22, power flows to nrf52832 and continues to flow even after the shunt jumper has been removed. I can not work out, how the mcu can continue to stay on without the shunt jumper. And how this behavior is triggered only after shorting P22 once. Resetting the chip turns it back to normal.

Measuring P22 reveals that is open circuit when device not powered but when powered and after inserting the shunt once, it becomes a short circuit. Does anyone know why this is happening, ie how can VDD_nrf be shorted to VDD, they seem to be very far away from each other on the pcb layout apart from where they join at SB9 and P22.

Thanks for the help, Bryan

  • 0

    Hi,

    One explanation to this behavior is that the chip is being powered through the GPIO pins. With the jumper attached, the chip starts up, and when you remove the jumper afterwards, the voltage on the GPIO pins are high enough to keep the chip powered even after you remove the jumper. When you reset the board without the jumper, you don’t have enough power on the GPIO pins to start the chip up.

  • 0

    Thanks for the prompt response. Is there any way to fix this? As I am unable to measure the current consumption in its current state.

  • 0

    Why are you not able to measure current consumption for the nRF52832? In order to measure current you connect the measuring equipment on P22, and there will not be any "open circuit"

  • 0

    As soon as I try and measure the current, I create a short between VDD and VDD_NRF, therefore the current read out becomes 0.

  • +1

    Try to program the DK with the BLE HRS example(just drag and drop the ble_app_hrs_pca10040_s132.hex file to the J-Link drive, the .hex is located in the folder, SDK_folder\examples\ble_peripheral\ble_app_hrs\hex ). After programming the DK,remove the jumper, and attach the measuring equipment on P22. Reset the board(click on the IF BOOT/RESET button), and then measure the current.

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