Custom NRF51822 board issue while detecting

RE: Custom NRF51822 board issue while detecting

sunny — Tue, 20 Dec 2016 10:59:26 GMT

Voltage regulator IC is provided in the custom board and supplied VTref is showilg approx to 3.2V. I was able to work with STLink Debugger after putting board in reset mode. Now able to dump binaries using Keil and OpenOCD both with StLink Debugger

RE: Custom NRF51822 board issue while detecting

Sigurd — Mon, 19 Dec 2016 12:40:24 GMT

Have you remembered to connected VTref to detect the voltage on the nRF?

Also note that with 3.7V you are outside the recommended supply voltage for the chip (min 1.8V, max 3.6V). The chip can be powered up to 3.9V, but exposure to voltage between 3.6V and 3.9V may for prolonged periods of time may affect the reliability of the chip.

RE: Custom NRF51822 board issue while detecting

sunny — Mon, 19 Dec 2016 05:05:57 GMT

Current I'm supplying 3.7 Volts to NRF board and it is connected to Jlink via Jumper Wires. Jumper can't be a problem or it can be? Sorry datasheet is not available for right now. The board was tested with JLink debugger with a speed of 20Khz. New Firmware of the board is not allowing to keep frequency below 100khz.

RE: Custom NRF51822 board issue while detecting

Sigurd — Fri, 16 Dec 2016 10:21:40 GMT

Hi,

This could be caused by long traces/cable length from the nRF51 to the debugger, or a bad connection. What voltage is supplied to the nRF51? Could you upload the schematic/layout? If you don’t want to share the schematic/layout here, you can summit a support ticket regarding this issue on MyPage.