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Original question:

BQ79631-Q1: Power supply query

BQ79631-Q1: EVM VREF1 connection

BaptisteF.
Prodigy 21 points
Part Number: BQ79631-Q1

Hello,

It seems from EVM guide SLUUCC3.pdf schematic page 24, that the HV voltage measurement has to make the current flow to VREF1.

Nevertheless, there is no VREF1 associated schematic: is it to be connected to TSREF on J36?

Thanks in advance for your hints,

Bap

  • 0
    TI__Genius 14890 points

    Bap,

    I'm not sure I follow the question. In figure 6-4, this shows GPIO3 driving the insulation detection circuitry which is supplied from HV_Plus. Figure 6-5 shows the current sense detection with an optional shunt or you can use TSREF to simulate a voltage on the SRP/SRN pins. I don't see any references to VREF1

  • 0 in reply to Alexander Scheuermann
    Prodigy 21 points

    Good morning,

    I cannot find any Figure 6-4 in sluucc3.pdf / BQ79631EVM Evaluation Module User's Guide...Thinking

    In this document, looking at "Figure 7-3. High Voltage Sense", at the feet of HV_Plus and HV_Fuse  measurement branches, there is GND unconnected and VREF1 connected to VC2, VC10.

    There is no other path for the current than flowing through VREF1, since all others are high impedance.
    But VREF1 is only connected to a jumper J36.

    Therefore the question arises: Is the jumper J36 implemented in order to connect either VREF1 to TSREF/VCC3V3_HV or does it have another purpose and VREF1 is connected somewhere else that I did not see on the Figure 7-3?

    Thanks in advance for your hints...

    Bap

  • 0 in reply to BaptisteF.
    TI__Genius 14890 points

    Bap,

    Sorry for the confusion, I think the figure and page numbering changed in one of the versions of this document.

    Therefore the question arises: Is the jumper J36 implemented in order to connect either VREF1 to TSREF/VCC3V3_HV or does it have another purpose and VREF1 is connected somewhere else that I did not see on the Figure 7-3?

    [Alex] Yes, essentially you are correct. I do not believe VREF1 is connected anywhere else on the PCB, aside from the jumper.