Disable target power-loss detection (TVRef or VTRef) on XDS110 debug probe

Hi,

I do not think we have a setting that does this, I will talk to the support team about this. Just curious, which device are you using?

Hi Benjamin,

Here is the complete part number of the debug probe: MSIP-REM-T3P-TMDSEMU110-U (94V-0, 3218)

I am using this debug probe with the TMS320F28379D microcontroller.

My JTAG connector has only 6 pins, which I use for TMS, TRST#, TCK, TDI, TDO, GND.

It is really unfortunate that the VTRef pin, which is supposed to be a feature, is mandatory for the proper operation of the debug probe. This also breaks backwards-compatibility with the previous generation of debug probes (XDS100).

I know this is not the first time someone "asked questions about the VTRef pin". I was hoping that a flag is added in the debug probe firmware which would disable the target power-loss detection, making the VTRef input optional. As I have already mentioned, I am bypassing this issue by connecting the 3V3 signal on the expansion connector (pins 27 and 29) via a 100R resistor on the VTRef input, but this is cumbersome and I would like to avoid it if possible.

Please let me know what you find out with the support team.

Thanks!

Hi Marko,

The engineer that works on XDS110 firmware is on vacation until 2/22/2024. I do not think we have this feature, but I'll let you know what they say when they get back.

Best Regards,

Ben Collier

Hi Ben,

Thanks for the update, and please let me know what you learn.

I personally know couple engineers that gave up on XDS110 exactly for this reason, i.e., for not being able to bypass the VTRef pin. It would definitely help if the VTRef pin could be disabled programmatically (e.g., via an input flag/switch or something).

Cheers,

Marko

Ok, I'll keep you updated.