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TPS65381A-Q1: Power on possible problems with TPS563210ADDFR

melania pontorno1
Prodigy 20 points
Part Number: TPS65381A-Q1
Other Parts Discussed in Thread: TPS563210A

Hi,

I have two questions related to each other:


1) is it possible that the TPS65381A-Q1 has a value less than 3.24V as the value of VDD3 / 5 (set to have 3.3V)?
For example, can this value be 1V?
2) And if so, being connected to the EN pin of the TPS563210ADDFR component,
would it belong to the indeterminate band between VENL and VENH, how does the TPS563210A behave?
Thanks.

  • 0
    TI__Expert 4690 points

    Hi Melania,

    Please find some comment to your questions below.

    melania pontorno1 said:

    1) is it possible that the TPS65381A-Q1 has a value less than 3.24V as the value of VDD3 / 5 (set to have 3.3V)?

    For example, can this value be 1V?

    VDD3/5 can only be configured to 3.3V and 5V. The only regulator which can be adjusted to a voltage between 0.8V-3.3V is VDD1 linear regulator by using an external FET. This configuration is described in section 6.2.2.2 of the datasheet.

    melania pontorno1 said:

    2) And if so, being connected to the EN pin of the TPS563210ADDFR component,
    would it belong to the indeterminate band between VENL and VENH, how does the TPS563210A behave?
    Thanks.

    I don't believe the behavior of the device can be determined when VEN is in this region. In order to guarantee the behavior of the device VEN voltage level shall meet the datasheet VENL/VENH min/max levels.

    Regards,
    Ivan 

  • 0 in reply to Ivan Calzada
    Prodigy 20 points

    Hi Ivan,

    Thanks for the answer, but my question was not if it is possible to have VDD3/5 with a value lower than 3.24V, but can it happen that for a malfunction it gives a lower value? And consequently, how does it behave?

    My fear is that VDD3/5 is due to a bad functioning of the chip equal to for example 1V, or being a safety component, is there not this possibility?

    Thank you and best regards.

    M.

  • 0 in reply to melania pontorno1
    TI__Expert 4690 points

    Hi Melania,

    Thank you for the clarification.

    There are a few type of faults which could occur on the system level which could cause undervoltage faults on VDD3/5. However, the TPS65381A-Q1 provides monitoring capabilities on all regulator outputs, which enables your system to detect and react to these faults.

    When an undervoltage is detected, the TPS65381A-Q1 transitions to RESET state, pulls down the reset line of your MCU (NRES pin) and also pulls low the saffing output (ENDRV pin). If the undervoltage is due to a transient fault then the device should be able to stabilize the regulators and transition to DIAGNOSTIC state where LBIST and ABIST routines are run to determine if the device is able to transition to Active state again. If the undervoltage is due to a permanent fault then the device will remain in RESET state since the device won't be able to stabilize the regulator. 

    The undervoltage level detection for this device is specified by VDD3/5_UV in page 12 of the datasheet (Min: 3V and Max:3.17V). 

    The timing for the device to detect a undervoltage event is described in Figure 5-15 in the datasheet. In order to detect an undervoltage fault, two events need to occur:

    1. VDD3/5 voltage drops below undervoltage detection level AND
    2. undervoltage event remains for longer than  VDDx_deglitch (Min:10usec and Max:40usec)

    Regards,
    Ivan