Hello, We are realizing a little board with DA14531 so to add BLE interface to our products. On 10 first samples rrealized only one is able to be programmed via JTAG interface using SmartSnippets Toolbox.
The error is a missing communication:
Could not measure total IR len. TDO is constant high.
No known chip found while opening JLink connection. Terminating proccess...
It appears like a soldering issue. With an XRAY control the solder of DA14531 does have some less tin and uneven solder, but it is difficult to judge whether all the solders are open-circuit.
I would like to ask you if you think this issue in your opinion depends only on soldering or if you suggest other controls.
Do you have any suggestion about the soldering process (e.g. temperature profile)?
Would you be available to check schematic and layout?
Thank you in advance.