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LM87CIMT-LM87CIMT/NOPB-LM87CIMTX/NOPB
Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing 24-TSSOP -40 to 125
LM87
www.ti.com SNAS034J –APRIL 2000–REVISED MARCH 2013
LM87 Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing
Checkfor Samples: LM87
1FEATURES DESCRIPTIONThe LM87isa highly integrated data acquisition
234• Remote diode temperature sensing(2 system for hardware monitoringof servers, Personal
channels) Computers, or virtually any microprocessor-based
• 8 positive voltage inputs with scaling resistors system.Ina PC, the LM87 can be usedto monitor
for monitoring+5V, +12V, +3.3V, +2.5V, power supply voltages, motherboard and processor
Vccp power supplies directly temperatures, and fan speeds. Actual values for
these inputs can be readat any time. Programmable
• 2 inputs selectable for fan speedor voltage WATCHDOG limits in the LM87 activatea fully
monitoring programmable and maskable interrupt system with
• 8-bit DAC output for controlling fan speed two outputs (INT# and THERM#).
Chassis Intrusion Detector input The LM87 has an on-chip digital output temperature
• WATCHDOG comparisonofall monitored sensor with 8-bit resolutionas wellas the capabilityof
values monitoring2 external diode temperatures to 8-bit
resolution, an8 channel analog input ADC with 8-bit
• SMBus™orI2C Serial Bus interfaceresolution and an 8-bit DAC.A channel on the ADC
compatibility measures the supply voltage appliedto the LM87,
• VID0-VID4or IRQ0-IRQ4 monitoring inputs nominally 3.3 V. Two of the ADC inputs can be
• On chip temperature sensor redirectedtoa counter that can measure the speedofto2 fans.A slow speed ΣΔ ADC architecture
APPLICATIONS allows stable measurementof signalsin an extremely
noisy environment. The DAC, witha0to 2.5V output
• System Thermal and Hardware Monitoring for voltage range, can be used for fan speed control.
Servers, Workstations and PCs Additional inputs are provided for Chassis Intrusion
• Networking and Telecom Equipment detection circuits, and VID monitor inputs. The VID
monitor inputs can also be usedas IRQ inputsif VID
• Office Electronicsmonitoringis not required. The LM87 hasa Serial
• Electronic Test Equipment and Bus interface thatis compatible with SMBus™ and
Instrumentation I2 C™.
KEY SPECIFICATIONS Connection Diagram Voltage Monitoring Error±2% (max) Error±4°C (max) Error±
