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AM2432: Connectivity Requirements (ALV Package)

IgorR
Prodigy 85 points
Part Number: AM2432

My questions here are in reference to datasheet Table 6-85. Connectivity Requirements (ALV Package)

  1.  For balls E9 (MCU_I2C0_SCL) and A10 (MCU_I2C0_SDA) it is stated that they must be connected to the corresponding power supply through separate external pull resistors to ensure these balls are held to a valid logic high level.
    • We are not using MCU_I2C0_SCL and MCU_I2C0_SDA in our design. Do I still need to pull-up these balls or can I leave them unconnected?
  2. Should these balls (T20, U21, T18, U20, U19, V20, V21, T17, R16, W20, W21, V18, Y21, Y20)be left unconnected when not using GPMC devices?
  3. When SDIO_LDO is not used to power VDDSHV5, each of these balls, H15 and K15, must be connected directly to VSS.
    • How about ball L14? Should it be connected to VSS or left unconnected? We are not using any of the IO group 5 functions.
  • +1
    TI__Mastermind 20087 points

    Hello,

    1) Yes, E9 and A10 should still be pulled high through external pull resistors even if not using I2C function.

    2) These balls are also responsible for setting the device boot mode and therefore must be set to the required valid logic level at boot-time to ensure proper boot mode/sequence.

    3) L14 and L15 are the supply pins for VDDSHV5. Even if not using SDIO_LDO, these pins should be connected to the corresponding power supply.

    Best Regards,

    Zackary Fleenor

  • 0 in reply to Fleenor
    Prodigy 85 points

    Hi Zackary,

    For 2) is it OK to permanently connect pull-up/down resistors to balls T20, U21, T18, U20, U19, V20, V21, T17, R16, W20, W21, V18, Y21, Y20 if we are only using to set the desired boot mode? No other devices connected to these pins.

  • +1 in reply to IgorR
    TI__Mastermind 20087 points

    Hello Igor,

    Yes, permanent pulls can be implemented via external resistors. SW is in charge of properly setting the associated PADCONFIG registers per application requirements, in this case the default configuration on reset should suffice.

    Best Regards,

    Zackary Fleenor