The LM25056 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 LM25056 continuously supplies real-time power,
voltage, current, and temperature data to the system management host via the SMBus
interface.
The LM25056 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. LM25056 current measurement has a ±1.5% accuracy over the temperature range of
-40°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.
