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Original question:

TPS650864: OTP programming and I2C configuration

TPS650864: PMIC AGND connection

Josh Wilson
Prodigy 120 points
Part Number: TPS650864

I have a question regarding the ground scheme around the TPS650864 PMIC regulator. In the datasheet it states to use a common-ground node for power ground and use a different, isolated node for control ground to minimize the effects of ground noise. Connect these ground nodes close to the AGND pin by one or two vias.I am wondering if AGND is supposed to be the isolated ground and is it ok to connect AGND to common-ground through a zero ohm jumper? It looks like in the functional block diagram AGND connects to the AGND pin and is also the reference for VREF, LDO3P3, VSYS, LDO5P0, V5ANA, ILIM1, ILIM2, ILIM6 pins.  

  • 0
    TI__Expert 4155 points
    Josh,

    I don't think there is any issue with that.

    The important thing with the ground connections is that components such as the VREF capacitor have a short and clean connection to AGND. Whether AGND is connected to common GND through a via or jumper shouldn't make much of a difference as long as it is out of the way of the VREF capacitor to AGND pin path.