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3.0 Voltage for vddio fails on silicon #524

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marwaneltoukhy opened this issue Jan 18, 2024 · 3 comments
Open

3.0 Voltage for vddio fails on silicon #524

marwaneltoukhy opened this issue Jan 18, 2024 · 3 comments

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@marwaneltoukhy
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marwaneltoukhy commented Jan 18, 2024 •
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3.0v for vddio fails all tests on silicon, however 3.1v passes.
@marwaneltoukhy marwaneltoukhy changed the title 3.0 Voltage for vccd fails on silicon 3.0 Voltage for vddio fails on silicon Jan 18, 2024
@RTimothyEdwards
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@marwaneltoukhy : Can you be any more specific about the mechanism of failure?

@RTimothyEdwards
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Never mind. . . This is very easy to reproduce. My chip under test fails intermittently at 3.00V but reliably at 2.95V.

@RTimothyEdwards
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Problem solved. It is caused by the component U4 on the development board that is driving the RESETB pin and has a trip point of 2.9V. This chip should never have been put on the board in the first place (and I said so during board review). It seems to have been added to the board due to a complete misunderstanding of the reset mechanism of the chip.

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@RTimothyEdwards @marwaneltoukhy