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BQ76930: How do you turn off the chip (electrically) ?

Part Number: BQ76930

How do you turn off the chip electrically ? I know that there is a shutdown mode for the chip. But how do I turn off the chip electrically ? The main intention is to reduce power consumption to the regulator, VC5x, and BAT pins in a switched off position. I am assuming the there would be a tiny leakage current through the chip if the cells are connected. But that is fine.

Would I have to add a switch on A,B and C wires shown in the picture ? If so, does the addition of long wires to the switches (1-10 ohm resistance ) on these leads result in inaccurate measurements ?  I'm open and hoping for any other simpler options to turn off power. 

  • Hi Eohan,

    The device expert will update this thread by COB Monday.

    Sincerely,
    Bryan Kahler

  • Hi Brian,
    Any chance to get an update by midday Friday, at least a preliminary one . Some revs of the board are being produced this weekend.
  • Hi Eohan,
    The part must have all power removed to disconnect. You can not break the points shown to remove power. The part will be powered through internal paths and may be damaged. The diodes shown in the schematics are important to keep the connected power pins near the input voltage level.
  • Hi, 

    What do you mean by all power removed ? Could you tell the pins that are powering the chip ? 

    WM5295 said:
    Hi Eohan,
    The part must have all power removed to disconnect. You can not break the points shown to remove power. The part will be powered through internal paths and may be damaged. The diodes shown in the schematics are important to keep the connected power pins near the input voltage level.

  • Hi Eohan,
    To remove power from the chip you will need to remove most if not all of the cell connections so that the power pins fall below VSHUT. See the data sheet. 5.3.1 may be helpful other than the REGSRC being shown as an input rather than power input as you observed before. However as noted above the inputs can not be allowed to be too far above the power pins.