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TFP410: Clarification Questions About Pins

Froylan Aguirre
Prodigy 140 points
Part Number: TFP410

After reading the datasheet and browsing the E2E forum, I have the following clarification questions about the TFP410.

1. If the hot plug feature isn't used, can the HTPLG pin be left floating?

2. Is Section 7.4.4 stating that the TFP410 must be reset after every powerup or only after momentarily bringing ISEL/RST low and then back high?

3. Also in section 7.4.4 the datasheet states "the device must be reset". Are they referring to using the PD pin, ISEL/RST pin, or the PD bit in CTL_1_MODE register to reset the TFP410?

  • 0
    TI__Guru**** 176811 points

    Hi,

    Please see my response below

    1. If the hot plug feature isn't used, can the HTPLG pin be left floating?

    No, I would pull the HTPLG pin high. 

    2. Is Section 7.4.4 stating that the TFP410 must be reset after every powerup or only after momentarily bringing ISEL/RST low and then back high?

    The TFP410 must be reset after the power up. 

    3. Also in section 7.4.4 the datasheet states "the device must be reset". Are they referring to using the PD pin, ISEL/RST pin, or the PD bit in CTL_1_MODE register to reset the TFP410?

    This is the PD pin. The ISEL/RST pin is only for resetting the I2C registers.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 140 points

    Thank you for your prompt response.

    So if I understood correctly, the PD bit in CTL_1_MODE register can't be used to reset the device only the physical PD pin, correct?

  • 0 in reply to Froylan Aguirre
    TI__Guru**** 176811 points

    Hi,

    No, it depends on whether the I2C interface is enabled or disabled. If you look at the PD pin description,

    the PD pin will be tied to ground when I2C is enabled and you will then use the PD bit to control the TFP410 reset.

    Thanks

    David