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LAUNCHXL-F28379D: BOOSTXL-3PhGaNInv power/debugging physical connections

Arun Kumar
Expert 1030 points
Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: BOOSTXL-3PHGANINV

Hello , 

I am having some trouble understanding which is the best/safest approach to isolate my power rails during debugging.

I have a LAUNCHXL-F28379D connected to BOOSTXL-3PhGaNInv

I want to achieve the following debugging scenario:

1. Isolation from USB(PC) to launchpad Jtag circuit, but power to the Microcontroller should come from the PC only.

2. Isolation of the microcontroller supply 3.3v (i.e I don't want the MCU supply to be derived from the non isolated VBUS(48v) on BOOSTXL-3PhGaNInv)

Is there a configuration to achieve the above?

In the BOOSTXL-3PhGaNInv user guide it states that "When the jumper J6 is populated, ensure that the C2000 LaunchPad is not
powered through USB. To ensure this, remove J6, or remove the JP1 and JP2
jumpers on the C2000 InstaSPIN-MOTION LaunchPad.", There a multiple places where J6 is referenced.

I searched the schematic for J6, but I am not able to find it, is this a typo or do you mean "J5"

Presently, we have uninstalled JP1 and JP2 for PC/Jtag isolation and J5 is installed on the BOOSTXL-3PhGaNInv board to power the launchpad. And JP3 on the Launchpad is also left uninstalled.

  • +1
    TI__Mastermind 18321 points

    Hi Arun,

    From reading through the User Guide, it does appear that it should be referring to the J5 jumper on the Boost EVM when it mentions J6 (as this also appears to be the only jumper on the EVM). You would want to have JP1 and JP2 on the LaunchPad removed, or J5 on the Boost EVM removed. 

    The Power Domain section in the LAUNCHXL-F28379D user guide explains the 3.3V power configurations. If you want isolation for the JTAG, JP1 and JP2 should be removed, which you have done correctly, and the LaunchPad becomes supplied with 3.3V from the Boost EVM with J5 on the Boost EVM attached. 

    In regards to your second (2) point, it does not look like there is a jumper to provide isolation for the 3.3V rail from the 48V on the Boost EVM if you are wanting to power the MCU with the Boost EVM.

    Our newer LaunchPads provide more jumper isolation options with additional isolation jumpers if you are interested in exploring those.

    Please let me know if this answered your question or if you have additional inquiries.

    Regards,

    Peter

  • 0 in reply to Peter Luong1
    Expert 1030 points

    Hi Peter , Thankyou for your replay. Yes i though as much, thanks for the confirmation.