1FEATURES

234• Input Voltage Range: 3V to 17V

• I2C/SMBus Interface with PMBus Compliant

Command Structure

• Remote Temperature Sensing with

Programmable Warning and Shutdown

Thresholds

• Real Time Monitoring of VIN, IIN, PIN, VAUX with

12-bit Resolution and 1 kHz Sampling Rate

• Current Measurement Error: ±0.5%: +10°C to

+85°C

• Voltage Measurement Error: ±1.0%: +10°C

to+85°C

• Power Measurement Error: ±1.5%: +10°C to

+85°C real•

True Input Power Measurement Using

Simultaneous Sampling of V IN and IIN Accurately Averages Dynamic Power Readings

• Averaging of VIN, IIN, PIN, and VAUX Over

Programmable Interval Ranging from 0.001 to

4 Seconds

• User Programmable WARN and FAULT

Thresholds with SMBA Notification

• Black Box Capture of Telemetry

Measurements and Device Status Triggered by

WARN and FAULT Conditions

• Full Featured Application Development

Software

• WQFN-24 Package

APPLICATIONS

• Server Backplane Systems

• Base Station Power Distribution Systems

• Subsystem Power Measurement

DESCRIPTION

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.