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no way to turn off oscillator X1 #19

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mossmann opened this issue Aug 17, 2019 · 2 comments
Open

no way to turn off oscillator X1 #19

mossmann opened this issue Aug 17, 2019 · 2 comments
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@yhetti
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enhancement potential new feature

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@mossmann
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It would be nice to have a method to turn on/off X1 and to have it default to off. I'm thinking a flip-flop such as NC7SZ175 that can be powered by VBAT and has 5.5V-tolerant inputs. The flip-flop can be controlled by a bigger I/O expander (see #17). X1 draws such a tiny current that it can easily be powered by the flip-flop output.
@yhetti
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yhetti commented Sep 10, 2019

Add an LED indicator to know when the oscillator is on.

yhetti added a commit to yhetti/jasmine that referenced this issue Oct 18, 2019
@yhetti
Changed LDO to to MIC5501 w/ EN pin to allow for configuration (resol…
8b7733e 
…ves issue greatfet-hardware#19)
@mossmann
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8b7733e provides a way to turn off VBAT which also turns off X1, but there is still no way to turn off X1 without switching off VBAT.

@straithe straithe added the enhancement potential new feature label Nov 1, 2021
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@mossmann @straithe @yhetti