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TMS320F28379D: F2837xD controlCARD SW1 Documentation Appears Incorrect

Kier
Mastermind 8855 points
Part Number: TMS320F28379D

There's two issues I'd like to highlight to alert other users because it's caused a lot of head scratching here.

1)

I have several examples of controlCARDs where SW1 is populated differently. i.e. Some are oriented up the others are oriented down. It means the meaning of UP and DOWN for 1 and 0 is incorrect for some controlCARDs. Note that all controlCARDs in my possession are ostensibly R1.3.

The upside down population of SW1 is acknowledged in the schematic of F2837x_180controlCARD_R1_3_SCH_02Oct2015.pdf.

2)

If we assume the upside down population of SW1, as per the schematic, is the latest design then the latest documentation (DelfinoTm TMS320F28379D controlCARD R1.3, SPRUI76A Revised January 2019) is incorrect. The switches are physically labelled 1, 2 and ON. In the inverted state, position 2 is GPIO72 (LH switch) and position 1 GPIO84 (RH switch) contrary to Table 2 in the manual.

To avoid all confusion and encompass all variations of SW1 population, I think SPRUI76A should only mention LH, RH and ON and avoid mentioning UP, DOWN, 0 and 1. For example:

  • 0
    TI__Mastermind 42195 points

    Kier,

    Thanks for the note. Please provide a photo of the two boards with the switches installed in opposing directions and I'll go have a conversation with the assembly house.

    The use of "ON" and "OFF" was originally avoided to avoid confusion with the inverted logic level as seen in the schematic. The switch's "ON" position is actually a logic 0 and vice versa. 

    Position 1 and Position 2 should never be switched, this is an assembly issue that I will work to address. although adding LH and RH does make this agnostic of the switch's assembly orientation.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Mastermind 8855 points

    Thanks for investigating Cody.

    Cody Watkins said:
    Please provide a photo of the two boards

    As requested, photo below. Please note the difference in colour is no guide to switch inversion since I also have a blue one with SW1 inverted. In fact, does the colour mean anything at all?

    Cody Watkins said:
    The use of "ON" and "OFF" was originally avoided to avoid confusion with the inverted logic level as seen in the schematic

    Yes I can see the rationale but ON and OFF nonetheless still appears in the Table 1 and unavoidably still appears in the switch.

    Position 1 and 2 above don't match the switch markings either.

    Cody Watkins said:
    Position 1 and Position 2 should never be switched, this is an assembly issue that I will work to address

    Agreed but since 1 and 2 are printed on the switch, I don't see how it's avoidable. In this case, it would be easier to change the manual. If there's still a mixture of boards out there the safest bet would be to abandon 1\2 in favour of LH\RH.

  • 0 in reply to Kier
    TI__Mastermind 42195 points

    I've begun working with the manufacturer to correct. Thanks for the feedback.