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Thread: FAQ for integrated voltage regulators (VDDP, VDDEXT, VDDC)

  1. #1

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    What is the typical use case for VDDEXT?

    VDDEXT is a 5V LDO in the device which is able to supply external loads(e.g. Sensors) . It can be activated and deactivated by the software.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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    Do I have to protect VDDEXT externally?

    VDDEXT is designed to be used off-board of the ECU. However, VDDEXT is not protected against high voltages (e.g. caused by a short circuit to the battery supply voltage).
    The TLE986x and TLE987x device families also offer an internal protection against overcurrent.
    Last edited by pestadieu; Jun 18th, 2019 at 06:22 AM.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3

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    Is VDDEXT internally protected?

    For the TLE987x device family, there are internal overload, overvoltage, undervoltage and overcurrent detectors. If enabled, all of them will trigger an interruption in case of such a detection. Similar detectors also exists for other device families.
    Last edited by pestadieu; Jun 18th, 2019 at 06:23 AM.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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    Can I use VDDEXT as the ADC reference voltage?

    Yes. If VDDEXT is externally connected to the VAREF pin, it is important to deactivate the internal 5V-Varef LDO, before activating VDDEXT. Otherwise 2 LDOs will try to supply each other, which will cause malfunction.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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    Can I use the generated voltage on the VDDC pin outside the product?

    We strongly recommend, NOT to use VDDC for other loads or components.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  6. #6

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    What is the need of the VDDC pin?

    The VDDC is the internal core voltage. The integrated VDDC LDO requires an external buffer cap.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  7. #7

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    What is the need of VDDP?

    The VDDP is the internal pad supply, it is used to supply the GPIOs, ADC1 and other 5V related modules inside the device. The integrated VDDP LDO requires an external buffer cap.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  8. #8

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    Can I use the VDDP generated voltage outside the product?

    In principle possible, but it is recommend to use VDDEXT instead. VDDP is usually used to supply an external ISP (debugger), in case of debugging the software or downloading code.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  9. #9

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    Can I use the VDDP generated voltage outside the ECU?

    In principle possible, but it is recommend to use VDDEXT instead. VDDP is usually used to supply an external ISP (debugger), in case of debugging the software or downloading code.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  10. #10

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    FAQ for integrated voltage regulators (VDDP, VDDEXT, VDDC)

    This thread is a collection of voltage regulator related questions.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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