https://devzone.nordicsemi.com/f/nordic-q-a/17050/gpio-held-highHi, recently I experienced a strange behavior on the nRF51 chip, that is at a certain point some gpio lines remained held high, even if the firmware set them to low (both at init and during functioning). Even after a firmware update through DFU serviceen-USTelligent Community 13Fri, 21 Oct 2016 09:23:19 GMThttps://devzone.nordicsemi.com/thread/65391?ContentTypeID=1Fri, 21 Oct 2016 09:23:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e068a5d0-d09a-4be3-80d2-18e2a62525a1Sigurd<p>Have you made any progress on this issue? What is the pin number of these 5 pins? What version of the SDK are you using?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/65390?ContentTypeID=1Mon, 17 Oct 2016 04:32:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cf8f9108-a121-4309-8b5a-3b3c364fca77stefano<p>30 GPIO are driving each one a FET transistor. also with a pull down of 100K. thus there is nothing from the electronic side pulling them up to high.</p> <p>even during reprogramming the pins where not coming down. 5 pins had this behavior, the other moved normally. Ater OFF-ON all pins behaved normally again.</p> <p>in the mean time however the driven solenoids burned as instead of 30% duty they got constant power....</p> <p>the nrf51 chip is contained in the fujitsu module MBH7BLZ02 we acquired from Rutronik about 4 months ago.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/65389?ContentTypeID=1Fri, 14 Oct 2016 08:30:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1cb462e3-d621-4728-a7b9-ce19bb55a714Sigurd<p>Is there something connected to these GPIO pins, that could pull them high? Also make 100% sure that the pins are not set high somewhere in the code. What is the packet variant and build code of the chip ? (can be read from markings on top of the nRF51 IC)</p><div style="clear:both;"></div>