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TPS65219: EN Power-up sequencing

Koshi Ninomiya
Expert 5465 points
Part Number: TPS65219
Other Parts Discussed in Thread: AM2432,

Tool/software:

Dear Team,

My customer is designing the application circuit of the TPS6521907 for powering the AM2432. They use default value of EEPROM of the TPS6521907.
They have a question about the EN/PB/VSENSE pin processing.
The TPS65219 datasheet, page 31, "Figure 7-2. Power-up sequencing (example)" shows the power-up sequence between the VSYS and the ON-Request, it is "tEEPROM_LOAD = ~2.3ms". It can be read by entering the ON-Request ~2.3ms after the EEPROM is loaded.

On the other hand, the (EN/PB/VSENSE pin) has three types of functions. And the On-Request appears to be valid only in PB mode.

If the application circuit is configured to pull-up the (EN/PB/VSENSE pin) at the VSYS potential, VSYS and (EN/PB/VSENSE terminals) start up at the same time.
They think there is no problem with this usage, but what is it?

Best Regards,

Koshi Ninomiya

  • +1
    TI__Expert 6245 points

    Hi Ninomiya-san,

    The pin description of EN/PB/VSENSE is ON-request input, which is an internal signal. It is normal to have a pull up on this pin to Vsys and both Vsys and EN will rise up together and internal signal will go high after EEPROM loading is complete.

    For a different version of the device when this pin is configured as PB, ON-request goes high when PB is pulled low for desired amount of time.

    Sathish