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 !

[Lars Sundell]

There is nothing special about gpio17 (pO.17). All gpios are equal (with exemption of the ones that have analog connections. Does this happen on several devices, or only one? My first suspec is that the device in question has a production error that is reviled in this particular case. Even thu all devices are thoroughly tested,it is not possible to test everything, so some devices might have errors.

[Ole Bauck]

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.

[cauzsh]

I use custom hardware, nothing is connect to gpio17. Thanks for your reply!

[cauzsh]

I change the same board with another 51822, and this phonomenon didn't arise again. It is an individual case. Thank you!

[cauzsh]

It is an individual case. When I use another 51822 chip, this didn't arise again.