The LM25056A combines high performance analog and digital technology with a
PMBus compliant SMBus/I2C interface to accurately
measure the operating conditions of electrical systems including computing and storage blades
connected to a backplane power bus. The LM25056A continuously supplies real-time power, voltage,
current, and temperature data to the system management host via the SMBus interface.
The LM25056A monitoring block captures both real-time and average values of subsystem
operating parameters (VIN, IIN,
PIN, VAUX) as well as peak power. Accurate power
measurement is accomplished by measuring the product of the input voltage and current through a
shunt resistor. LM25056A current measurement has a ±0.5% accuracy over the temperature range of
+10°C to +85°C with operation from -40°C to +125°C. A black box (Telemetry/Fault Snapshot) function
captures and stores telemetry data and device status in the event of a warning or a fault.
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