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Don't load REF pin of MAX1968 chip on HWRevs < 3.0 #103

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sb10q merged 1 commits from atse/thermostat:stop_loading_vref into master 2024-04-24 18:04:56 +08:00
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atse commented 2024-04-03 16:39:37 +08:00
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The REF pin of the MAX1968 TEC chip on hardware revisions v2.x is missing a buffer, loading the pin on every CPU ADC read. Avoid reading from it and leave the pin floating on affected hardware revisions, and return the nominal 1.5V instead.

Workaround of https://github.com/sinara-hw/Thermostat/issues/117.

The REF pin of the MAX1968 TEC chip on hardware revisions v2.x is missing a buffer, loading the pin on every CPU ADC read. Avoid reading from it and leave the pin floating on affected hardware revisions, and return the nominal 1.5V instead. Workaround of https://github.com/sinara-hw/Thermostat/issues/117.
atse added 1 commit 2024-04-03 16:39:38 +08:00
09be55e12a Don't load REF pin of MAX1968 chip on HWRevs < 3.0 
The REF pin of the MAX1968 on hardware revisions v2.x is missing a
buffer, loading the pin on every CPU ADC read. Avoid reading from it and
leave the pin floating on affected hardware revisions, and return the
nominal 1.5V instead.
sb10q merged commit 09be55e12a into master 2024-04-24 18:04:56 +08:00
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Reference: M-Labs/thermostat#103
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