Other Parts Discussed in Thread: MSP430FR2676, , ENERGYTRACE
I have a custom board which contains the MSP430FR2676 MCU on it. I am powering the MCU locally using a 3.3V LDO on the custom board. I used the 20-pin CAPTIVATE-PGMR on the custom board to program the MSP430 using 2-wire interface. While I am able to program the MCU, I notice that if I unpower my board but leave the CAPTIVATE programmer hooked up, the programmer powers my board via the VCC_TARGET pin which is pin 18. Below is a capture of the programmer header according to the CAPTIVATE-PGMR design center note, which shows that pin 18 is a target vcc pin (or so I assumed). According to the CAPTIVATE-PGMR schematic, pin 18 is an output pin (supplied by a 3.3V LDO). Since I am powering my board locally, should I leave pin 18 disconnected to avoid this reverse power situation? Does the programmer require a VCC_Target reference or is that fixed on the programmer at 3.3V? The design note doesn't make this clear.
Below is the programmer header portion of my schematic showing 3V3_MSP on pin 18. This net is supplied by a local 3.3V LDO which supplies other peripherals as well. So again my question is should I disconnect 3V3_MSP from pin 18?
Thanks in advanced for the help!