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BQ76PL455EVM-GUI-SW: Question about minimal bridge setup

Jeroen Wortelboer
Prodigy 20 points
Part Number: BQ76PL455EVM-GUI-SW


Tool/software:

I have looked at the bridge sample for this ic and it uses a step up regulator to create a 12V from which it powers the ic via the internal regulator / external transistor LDO. The datasheet tells me that this chip can also be powered by supplying power to the VDIG ( and VIO) pins, while sidabling the internal regulator via device configure CMD 0x0E.  For a minimal briidge configuration, this looks promissing. I wont be measuring anything on the voltage pins, i will only be using htis chip to let a cpu communicate to a string of other BQ76PL455's that are daisy chained to it.   Am i missing somting? why is the bridge sample using a step up regulator for this purpose. Would i be violating/ breaking anything if i woul d to power the chip directly to VDIG, disabling the internal regulator and connecting all sence pins to ground..?  That would be really minimalistic. 

  • 0
    TI__Expert 6940 points

    Jeroen,

    We do not recommend using these devices in any new projects. The newer line of BQ796xx devices are safer and more accurate. 

    You can do what you are suggesting. 

    Regards,

    Bo

  • 0 in reply to Benjamin Luty
    Prodigy 20 points

    I need to interface with (legacy) devices that already have this chip in them and because the inter-chip communication is proprietary i don't have a lot of choice.  If you know a newer model chip that can interfacein a daisy chain  to this older model then i would be very interested.

    Thanks for confirming that i can power the chip via an external power,connect the battery 'sence' pins to ground and only use the chip for upstream communication. A kind of uart-to-iso-spi (?) bridge so to say. 

  • 0 in reply to Benjamin Luty
    Prodigy 20 points

    Hi Bo,

    i tried powering the device with just 5V on the DIG and the TOP / SENSE pins to ground or 5V but i get no response from the chip. Only with 12V on the TOP pin, it comes to live. Is there any way i can make this work with just 5V and no step up ?  Feels silly to only use the step up to make the sense pins happy..

    Cheers

    Jeroen