Aspeed Ast2500 Datasheet [exclusive] -

The AST2500 requires multiple voltage rails, and the datasheet specifies tight tolerances:

The AST2500 has two dedicated Thermal Diode inputs (D1P/D1N). These are designed for reading CPU substrate diodes (transistor junction voltage). Do not plug a standard thermistor (10k NTC) into these pins—the biasing current is wrong. Use the standard ADC pins for thermistors. Aspeed Ast2500 Datasheet

The AST2500 is the "goldilocks" BMC for most 2nd and 3rd generation Intel Xeon Scalable (Purley) and AMD EPYC (Naples/Rome) servers. It balances cost, power, and features. The AST2600 is overkill for many applications, while the AST2400 is obsolete for security-sensitive designs. The AST2500 requires multiple voltage rails, and the

If you are looking at the initial AST2500 datasheet (released 2016), security is weak. Revision 1.03 of the datasheet introduced and PFR (Platform Firmware Resilience) support. Use the standard ADC pins for thermistors