What are the differences among LM25066I, LM25066A, LM25066IA, and LM25066?
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All the variants of LM25066 are pin to pin compatible and same from the hardware point of view. The key difference among LM25066I, LM25066A, LM25066IA, and LM25066 is telemetry accuracy. Please refer to the “Telemetry Accuracy” of the “Electrical Characteristics” table in each datasheet for more details. "A" stands for better telemetry accuracy and "I" represents that the particular variant is IntelTM Node Manager complaint.
LM25066I and LM25066IA add the READ_EIN energy accumulator feature and are fully compliant to IntelTM Node Manager 2.0 & 2.5, while the other two don’t.
Please see the attached comprehensive summary of the commands supported by the different variants.
It’s recommended to use MFR_SPECIFIC_18: AVG_BLOCK_READ (E2h) and MFR_SPECIFIC_10: BLOCK_READ (DAh) block read commands to retrieve the most recent diagnostic and telemetry information in a single transaction. These make all the variants of LM25066 to be fully firmware compatible apart from READ_EIN (86h).