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Is there some relations between Gpio17 and ble advertisement on nRF51822?

cauzsh

Hi there: I found a strange phonomenon about consumption betweeen advtisement and gpio17 of 51822. When I start ble adv while setting gpio17 to input disconnected mode with no_pull, the min consumption can be less than 5uA, but when I change gpio17 to input mode with pullup, the min consumption can be continuous 200uA. I haven't connect any gpios outside. Besides, this phonomenon don't appear on other ports. I wonder how does it happen.

Best Regards !

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    Are you using custom hardware or the nRF51 DK (PCA10028)? On the DK this pin is connected to a button, but this should not matter if the button is not pushed (it will in that case be floating).

    200uA sounds like the pin is connected to GND. The internal pull-up resistor is typically 13KOhm, see the Product Specification. If Vdd is 3V, then the leakage current (if the pin is connected to GND and internal pull-up is enabled) will be 230uA.

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  • 0

    Are you using custom hardware or the nRF51 DK (PCA10028)? On the DK this pin is connected to a button, but this should not matter if the button is not pushed (it will in that case be floating).

    200uA sounds like the pin is connected to GND. The internal pull-up resistor is typically 13KOhm, see the Product Specification. If Vdd is 3V, then the leakage current (if the pin is connected to GND and internal pull-up is enabled) will be 230uA.

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