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3.3V rail at ~0.5V #28

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fmckeogh opened this issue Apr 12, 2019 · 4 comments
Open

3.3V rail at ~0.5V #28

fmckeogh opened this issue Apr 12, 2019 · 4 comments
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@fmckeogh
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When powered via a battery, the 3.3V is at ~0.5V, so very likely to be an issue with the onboard regulator circuit. Needs to be fixed by OxidizeConf as demo requires battery power.

Temporary fix is to use an external known-good regulator to bypass the onboard one.
@fmckeogh fmckeogh added the bug Something isn't working label Apr 12, 2019
@fmckeogh fmckeogh added this to the OxidizeConf milestone Apr 12, 2019
@fmckeogh
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fmckeogh commented Apr 17, 2019 •
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The issue is that I failed to read the data sheet properly; SHUTDOWN on the TC1014 cannot be left floating. A new PCB revision should address this with a high value resistor between SHUTDOWN and GND, and then expose SHUTDOWN and BATT_POSITIVE on the header pins for an on/off switch.

@jonas-schievink
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a high value resistor between SHUTDOWN and GND

Did you mean SHUTDOWN and VCC here?

@fmckeogh
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No, I think the the board should be normally off when a battery is connected, and shorting the two header pins with a switch should bring it on.

@fmckeogh fmckeogh removed this from the OxidizeConf milestone Apr 18, 2019
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fmckeogh commented Apr 18, 2019 •
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Removed the OxidizeConf milestone as I have patched the board I will be using and there is no time for a new PCB run.
IMG_0045

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@jonas-schievink @fmckeogh