I find a new phenomenon that the 3V7 value will be lower if the CPU tempature (got by vcgencmd measure_temp) goes higher.
e.g. When 40'C, 3V7=3.69v
When 50'C, 3V7=3.67v
When 60'C, 3V7=3.64v
...
When 70'C, 3V7=3.60v
And When 70'C, if I use an ice pack to cool down the Pi to 40'C, the 3V7 turns from 3.60v to 3.69v quickly.
All other Voltage (like PD 5V) values keep steady during all my tests.
And it has nothing to do with FAN (I unplugged it and re-test).
I think whether it's an accuracy bug about the built-in Voltage meter or the PMIC 3V7 converter. I cannot find the test pad of 3V7 so I cannot prove it.
e.g. When 40'C, 3V7=3.69v
When 50'C, 3V7=3.67v
When 60'C, 3V7=3.64v
...
When 70'C, 3V7=3.60v
And When 70'C, if I use an ice pack to cool down the Pi to 40'C, the 3V7 turns from 3.60v to 3.69v quickly.
All other Voltage (like PD 5V) values keep steady during all my tests.
And it has nothing to do with FAN (I unplugged it and re-test).
I think whether it's an accuracy bug about the built-in Voltage meter or the PMIC 3V7 converter. I cannot find the test pad of 3V7 so I cannot prove it.
Statistics: Posted by q948171624 — Sat Nov 16, 2024 12:20 pm