JLINKk programming header w/ tag connect

[andrew sauter]

Hello,

We want to use the J-Link Needle Adapter for nRF51822

The attached (capture.jpg) is the pinout from the J-Link Needle Adapter datasheet.

the attached (capture2.jpg) is how I intend to connect.

questios:

1. do I connect the nReset to pin10 (also SWDIO)?
2. does SWCLK need 100k pull down (I read elsewhere from JLINK)?
3. should I power board during programming? operate at 2.5V?

www.segger.com/jlink-needle-adapter.html

will this be able to program OTA?

thanks,

Capture.JPG

Capture2.JPG

[Christopher Mason]

I have a design using the TagConnect TC2030-CTX with the Segger JLink Lite (included in the Nordic Dev Kit) and the NRf51822. It seems to work ok. Addressing your specific questions:

No, I have not found nReset to be needed. I believe the NRF51822 uses the SWDCLK line for reset (making it somewhat non-standard). I'm using only the 12k resistor on SWDCLK as recommended by Nordic. Yes, I power the board externally during programming, but with 3.3V. I'm not sure about 2.5V. The power pin (1) to the Segger is for voltage reference and does not supply power from the programmer to the chip.

I use the pinout: 1: Power 2: SWDIO 4: SWDCLK 5: GND

Hope this helps!

[andrew sauter]

like so (except for the 3.3V and 12k)?

thanks for the reply.

Capture.JPG

[Christopher Mason]

Yeah, but be aware that I'm using the 6 pin version instead of 10 pin. The pinout seems to match up though.

[Hung Bui]

Hi Andrew,

Christopher is correct. nReset is not needed. 12k (10k is OK) pull down needed.

If you use Segger Jlink Lite programmer, you would need to provide 3.3V input voltage for the board. And yes you need to power the board when programming.

Device firmware update over the air will be released in the next SDK (v4.4) which is scheduled for this week. Note that it's firmware update, not programming, so you need to flash the BLE stack and bootloader for the first time using SWD.

[andrew sauter]

thanks chirs and hung