TI-LM25056A.pdf
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LM25056A
www.ti.com
SNVS785A –JANUARY 2011–REVISED APRIL 2013
LM25056A System Power Measurement IC with PMBus
Check for Samples: LM25056A
1
FEATURES
APPLICATIONS
234
• Input Voltage Range: 3V to 17V
• Server Backplane Systems
• I
2
C/SMBus Interface with PMBus Compliant • Base Station Power Distribution Systems
Command Structure
• Subsystem Power Measurement
• Remote Temperature Sensing with
Programmable Warning and Shutdown DESCRIPTION
Thresholds
The LM25056A combines high performance analog
and digital technology with a PMBus™ compliant
• Real Time Monitoring of V
IN
, I
IN
, P
IN
, V
AUX
with
SMBus™/I
2
C interface to accurately measure the
12-bit Resolution and 1 kHz Sampling Rate
operating conditions of electrical systems including
• Current Measurement Error: ±0.5%: +10°C to
computing and storage blades connected to a
+85°C
backplane power bus. The LM25056A continuously
• Voltage Measurement Error: ±1.0%: +10°C
supplies real-time power, voltage, current, and
temperature data to the system management host via
to+85°C
the SMBus interface.
• Power Measurement Error: ±1.5%: +10°C to
+85°C
The LM25056A monitoring block captures both real-
time and average values of subsystem operating
• True Input Power Measurement Using
parameters (V
IN
, I
IN
, P
IN
, V
AUX
) as well as peak
Simultaneous Sampling of V
IN
and I
IN
power. Accurate power measurement is
Accurately Averages Dynamic Power Readings
accomplished by measuring the product of the input
• Averaging of V
IN
, I
IN
, P
IN
, and V
AUX
Over
voltage and current through a shunt resistor.
Programmable Interval Ranging from 0.001 to
LM25056A current measurement has a ±0.5%
4 Seconds
accuracy over the temperature range of +10°C to
+85°C with operation from -40°C to +125°C. A black
• User Programmable WARN and FAULT
box (Telemetry/Fault Snapshot) function captures and
Thresholds with SMBA Notification
stores telemetry data and device status in the event
• Black Box Capture of Telemetry
of a warning or a fault.
Measurements and Device Status Triggered by
WARN and FAULT Conditions
• Full Featured Application Development
Software
• WQFN-24 Package
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SMBus is a trademark of Intel Corp..
3PMBus is a trademark of SMIF, Inc..
4All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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