MICROCONTROLLER NOT GETTING DETECTED

[Boopathi]

Been trying to code the nRF52805-CAAA-R7. The problem is that the IC is not getting detected for programming using nrf connect. Is this the problem because of WLSCP package or soldering issue or by any other means. The circuit has been taken reference from datasheet.

[Vidar Berg]

Hello,

The screenshot from the Programmer app shows the devices as "unknown." How have you connected your board to the PC? Do you have a J-Link debug probe in between?

Best regards,

Vidar

[Boopathi]

trying to program it through nRF52DK EVALUTION board by connecting 5V,GND CLK AND DATA

[Vidar Berg]

I'm not sure what device you have connected that enumerates as 'Unknown', but you should ignore that device and select the nRF52 DK instead.

[Boopathi]

NRF52DK is being programmed without any issues, however the 52805 module I'm trying to program is not being detected.

[Boopathi]

I'm not trying to program the NRF52DK, I'm using it as a debugger for NRF52805. which is connected to it using SWD. Its the same board which appears as unknown in the nRF Connect Programmer.

[Vidar Berg]

Since you are using the nRF52 DK to program an external target, you need to select nRF52 DK from the dropdown menu as your programming device. Any external targets connected to the DK will not be detected here.

The connections you need to make between your DK and your external board is described here: https://docs.nordicsemi.com/bundle/ug_nrf52832_dk/page/UG/dk/hw_debug_out_segger53.html 

Boopathi said:

5V,GND CLK AND DATA

Please note that the VDD voltage on the nRF5 must match the VDD voltage on the DK. Also, the VDD voltage on the nRF52805 must never exceed 3.9V. 

[Boopathi]

Yeah there is a LDO in the board which converts to 1.8V

[Vidar Berg]

As mentioned above and in the DK documentation, the VDD on both the DK and target board must match. The OB Jlink on the DK does not have a built-in level shifter.