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LM81

Features: · Temperature sensing·6 positive voltage inputs with scaling resistors for monitoring +5V, +12V, +3.3V, +2.5V, Vccp power supplies directly·8-bit DAC output for controlling fan speed· 2 fan speed monitoring inputs·Chassis Intrusion Detector input·WATCHDOG™ comparison of all monitor...

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SeekIC No. : 004396215 Detail

LM81: Features: · Temperature sensing·6 positive voltage inputs with scaling resistors for monitoring +5V, +12V, +3.3V, +2.5V, Vccp power supplies directly·8-bit DAC output for controlling fan speed· 2 fa...

LM81 Data Sheet

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Part Number:
LM81
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

· Temperature sensing
·6 positive voltage inputs with scaling resistors for monitoring +5V, +12V, +3.3V, +2.5V, Vccp power supplies directly
·8-bit DAC output for controlling fan speed
· 2 fan speed monitoring inputs
·Chassis Intrusion Detector input
·WATCHDOG™ comparison of all monitored values
·SMBus Serial Bus interface compatibility
· VID0-VID4 monitoring inputs




Application

· System Thermal and Hardware Monitoring for Servers and PCs
· Office Electronics
· Electronic Test Equipment and Instrumentation






Specifications

Positive Supply Voltage (V+) ..............................................................+6.0V
Voltage on Any Input or Output Pin:
+12Vin, T_CRIT_A .................................................................−0.3V to +15V
A0, A1, DACOut .............................................................−0.3V to (V++ 0.3V)
+2.5Vin, +3.3Vin ..............................................................................(Note 3)
All other pins ............................................................................−0.3V to +6V
Input Current at any Pin (Note 4) ......................................................±5 mA
Package Input Current (Note 4) .......................................................±20 mA
Maximum Junction Temperature
(TJ max) ..............................................................................................150°C
ESD Susceptibility (Note 6)
Human Body Model ..............................................................................2000V
Machine Model .......................................................................................200V
Soldering Information
MTC Package (Note 7) :
Vapor Phase (60 seconds) .................................................................215°C
Infrared (15 seconds) ........................................................................235°C
Storage Temperature ......................................................−65°C to +150°C

Temp Resolution 9-bit/0.5degC;12-bit/0.0625degC
TruTherm(TM) Beta Compensation No
Analog Inputs 6
ADC Resolution 8 bits
Fan Speed Inputs 2
Fan Control Output(s) 1 DAC
Fan Control Method Undefined
VID Inputs 5
Dynamic VID VCCP Monitoring Undefined
Bidirectional PROCHOT Support Undefined
GPIOs CI, RESET
Interrupt Outputs 2
Reference Voltage Undefined
Temperature Accuracy (+/-) 3 deg C
Temperature Min -40 deg C
Temperature Max 125 deg C
Interface Type SMBus
Supply Min 2.8 Volt
Supply Max 3.8 Volt
Quiescent Current 0.9 mA
Resolution 9 bits
Temperature Accuracy (+/-) 3 deg C
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Description

The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG™ limits in the LM81 activate a fully programmable and maskable interrupt system with two outputs (INT and T_CRIT_).

The LM81 has an on-chip digital output temperature sensor with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit resolution and an 8-bit DAC. Two fan tachometer outputs can be measured with the LM81's FAN1 and FAN2 inputs.

The DAC, with a 0 to 1.25V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs.

The LM81 has a Serial Bus interface that is compatible with SMBus™.






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