esp32的rtc时钟源
Posted: Fri Mar 18, 2022 9:43 am
默认的时钟150KHZ的，实测深度睡眠下的精度不大好，大概2小时差1分钟
改用Internal 8.5MHz oscillator, divided by 256 (~33kHz)，说明中说：
Provides better frequency stability than the internal 150kHz RC oscillator at the expense of higher (by 5 uA) deep sleep current consumption. It also does not require external components.
实际测试使用时钟150KHZ，深度睡眠，PCB整机电流30uA
使用Internal 8.5MHz oscillator, divided by 256 (~33kHz)，深度睡眠，整机电流400uA。
这个差距，不像说明里写的，仅需5uA的额外电流啊
改用Internal 8.5MHz oscillator, divided by 256 (~33kHz)，说明中说：
Provides better frequency stability than the internal 150kHz RC oscillator at the expense of higher (by 5 uA) deep sleep current consumption. It also does not require external components.
实际测试使用时钟150KHZ，深度睡眠，PCB整机电流30uA
使用Internal 8.5MHz oscillator, divided by 256 (~33kHz)，深度睡眠，整机电流400uA。
这个差距，不像说明里写的，仅需5uA的额外电流啊