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TPS65910: OSC32KIN Pin Floating

Steve Widener
Genius 9575 points
Part Number: TPS65910

The OSC32KIN pin is recommended to be grounded per the schematic checklist. If this pin is left floating, how will this impact the operation of the TPS65910 - including any increased power consumption.

The full part number of the device is TPS65910AA1RSL

  • 0
    TI__Genius 17380 points
    Hi Steve,

    It is not a defined state so the exact results of such a configuration are unknown.

    The TPS65910AA1RSL uses the internal RC oscillator by default so the impact on operation should be minimal as long as they don't switch to external oscillator accidentally in the DEVCTRL_REG register.

    Based on Figure 6-3 in the datasheet, there is a Schmitt trigger comparator connected to OSC32KIN which may trigger due to the noise on a floating input so there could be some power consumption toggling that output, though I would expect the impact to be pretty small.

    If the customer is concerned, they can test their particular use case with the TPS65910AEVM-583 though we would of course recommend that they not float the pin.