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另外，可以先参考下面的文档。 VMON_VSYS (Recommend provisioning the external resistor voltage divider for early supply failure indication irrespective of the software implementation). For connecting the system voltage (main supply voltage such as 3.3 V, 5 V or other voltage levels) through an external resistor voltage divider, see the System Power Supply Monitor Design Guidelines section of the device-specific data sheet. It is recommend to implement a noise filter (capacitor) across the voltage divider output since VMON_VSYS has minimum hysteresis and a high-bandwidth response to transients. https://www.ti.com/lit/an/sprad05b/sprad05b.pdf
