Bricked nRF51822

RE: Bricked nRF51822

Stian Røed Hafskjold — Wed, 26 Aug 2015 14:01:44 GMT

Seems like the JLink Lite specs are a bit limited (maybe it just shows the typical value or something), and I couldn't find a proper datasheet for it either. But I did some testing now, and I am able to flash the chip all the way down to 2.3V using the JLink Lite. I also tested using a JLink Base, and I could flash the chip down to 1.8V.

RE: Bricked nRF51822

GT — Wed, 26 Aug 2015 10:38:32 GMT

I am using J-Link LITE. I just checked the specs and there is written that the "Target Interface Voltage" is 3.3 volts. In general a BLE peripheral is battery powered witch implies a target voltage lower than 3 volts. How these two facts fit together?

RE: Bricked nRF51822

Stian Røed Hafskjold — Wed, 26 Aug 2015 09:16:05 GMT

It depends on the J-Link you have. J-Link Lite does not support a target voltage of less than 3V (I think)

RE: Bricked nRF51822

GT — Tue, 25 Aug 2015 13:23:20 GMT

Solved!

The problems was low battery voltage. The datasheet of the chip says that the minimum operation voltage is 1.8 volts, however with target voltage of 2.17 volts, the J-Link can not establish a connection with the board.

Any comments on that?