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LM81BIMT-3/NOPB |LM81BIMT3NOPBNSN/a534avaiSerial Interface ACPI-Compatible Microprocessor System Hardware Monitor 24-TSSOP -40 to 125
LM81CIMTX-3/NOPB |LM81CIMTX3NOPBNSN/a2500avaiSerial Interface ACPI-Compatible Microprocessor System Hardware Monitor 24-TSSOP -40 to 125


LM81CIMTX-3/NOPB ,Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor 24-TSSOP -40 to 125FEATURES APPLICATIONS2• Temperature Sensing • System Thermal and Hardware Monitoring forServers and ..
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LM8261M5X NOPB ,RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT23-5 5-SOT-23 -40 to 85Features... 17.3 Estimating the Output Voltage Swing... 222 Applications..... 17.4 TFT Applications ..
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LM81BIMT-3/NOPB-LM81CIMTX-3/NOPB
Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor 24-TSSOP -40 to 125
LM81
www.ti.com
SNAS011E–JUNE 1999–REVISED FEBRUARY 2002
LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Checkfor Samples: LM81
1FEATURES APPLICATIONS Temperature Sensing • System Thermal and Hardware Monitoring for
Servers and PCs• 6 Positive Voltage Inputs with Scaling
Resistorsto Monitor +5V, +12V, +3.3V, +2.5V, • Office Electronics
Vccp Power Supplies Directly • Electronic Test Equipment and 8-Bit DAC Output for Controlling Fan Speed Instrumentation 2 Fan Speed Monitoring Inputs DESCRIPTION• Chassis Intrusion Detector Input
The LM81isa highly integrated data acquisition• WATCHDOG Comparisonofall Monitored system for hardware monitoringof servers, PersonalValues Computers, or virtually any microprocessor-based SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial system.Ina PC, the LM81 can be usedto monitor
power supply voltages, temperatures, and fanBus Interface Compatibility
speeds. Actual values for these inputs canbe readat• LM81B has Improved Voltage Monitoring any time. Programmable WATCHDOG limitsin theAccuracy LM81 activatea fully programmable and maskable• VID0-VID4 Monitoring Inputs interrupt system with two outputs (INT and T_CRIT_).
The LM81 has an on-chip digital output temperatureKEY SPECIFICATIONS sensor with 9-bitor 12-bit resolution,a6 analog input
ADC with 8-bit resolution and an 8-bit DAC. Two fan• Voltage Monitoring Error: +2%or ±1.2% (max) tachometer outputs can be measured with the LM81’s• Temperature Error FAN1 and FAN2 inputs. The DAC, witha0to 1.25V −40˚Cto +125˚C± 3˚C (max) output voltage range, can be used for fan speed
control. Additional inputs are provided for Chassis• Supply Voltage Range: 2.8Vto 3.8V Intrusion detection circuits, and VID monitor inputs.• Supply Current: 0.4 mA (typ) The LM81 has a Serial Bus interface that is ADC and DAC Resolution:8 Bits compatible with SMBus. Serial Bus Timing Diagram Temperature Resolution: 0.5˚C
TYPICAL APPLICATION
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