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Type: Posts; User: PaulStoffregen

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  1. All sorts of unrelated problems are possible with...

    All sorts of unrelated problems are possible with low quality DC-DC converters. Especially the very small ones tend to not have enough capacitance at the input and output. Some people (including...
  2. Final followup on startup voltage. All new...

    Final followup on startup voltage. All new Teensy 4.0 and 4.1 now have the 470K resistor, which allows startup down to about 3.2 volts.
  3. I've spent some more time investigating this...

    I've spent some more time investigating this problem. It all comes down to resistor R4.

    28976

    If you just remove R4, your Teensy 4.0 will be able to start up with approx 3.2 volts (and the...
  4. Sorry about the delay. I've been investigating...

    Sorry about the delay. I've been investigating here. Looks like there is indeed a hardware issue with some Teensy 4.0 boards not starting up with less than 4 volts at VUSB / VIN. It's related to...
  5. I tested a couple Teensy 4.0 boards programmed...

    I tested a couple Teensy 4.0 boards programmed with LED blink. Both are able to boot up when 3.25 volts is applied to VIN.
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