Hi,
I'm powering nucleo with 3.3V directly to CN4/14 +3V3. SB14, SB9 are removed, JP1 is open. Works fine, BUT current is much higher than measured over JP1 when powered from USB??
USB is powering U5V which is powering ST- link 5V and 3V3 which is a 'parallel' power line to U3->VO->+3V3 and they should not have any sink in common??
So where is +3V3 'leaking'? to ST- link circuit??
In UM1956 there is in section 7.4.2 a paragraph:
+3V3 power supply
Using the +3V3 (CN4 pin 14) directly as a power input can be interesting, for instance, if
3.3 V is provided by a shield board. In this case, ST-LINK is not powered, thus programming
and debugging features are unavailable. When the board is powered by +3V3 (CN4 pin 14),
the solder bridge SB14 and SB9 (NRST) must be off.
So could someone please assist me what am I doing wrong or what is missing or....
BR, ristoH
