STLink V3MINIE no target voltage

[Seba52]

I have the STLink V3MINIE. When connected to the PC the red power LED is on. But I can't program any device because there is not target voltage. 

ST Prog (v2.17) shows Target voltage 0.00 V

How can I fix this? Is there a jumper or solder connection missing on the stlink? Or is the board damaged?

Thanks for help! 

[Seba52]

We will use the TagConnect TC2030 https://www.tag-connect.com/product/tc2030-ctx-nl-stdc14-for-use-with-stm32-processors-with-stlink-v3 to connect the stlink v3minie to the PCB, that's why the power on the T_VCC pin is needed. I think, I will find a solution to achieve this. 

[Andrew Neil]

The TagConnects are nice - basically a portable "bed-of-nails".

That one has 6 pins.

You need GND, SWDIO, SWCLK;

Useful to have are also NRST and T_VCC;

So that leaves you one spare to use as a supply to your target

[Seba52]

Yes, they are very handy. All the essential signal are there, also SWO. I will try to wire the 3.3V to T_VCC on the stlink v3minie board as I mentioned above. Than it should be possible to program the pcb if not mounted to anything else. 

[TDJ]

I’ve just realized that debugging will not start without detecting the target voltage (pin 3 connected). This voltage is likely required by the level shifters. My custom probe doesn’t provide the target voltage, since I can use only four pins, and in addition to GND, SWDIO and SWCLK, I need TX. Below is working workaround I just tested.
Needless to say, this solution can be used with 3.3 V system only. I purposely used older STLINK-V3MODS because it is easier to modify.

[Andrew Neil]

---

@TDJ wrote:

This voltage is likely required by the level shifters. 

---

Indeed.