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LM81CIMTX-3 Datasheet

  • LM81CIMTX-3

  • Single-Ended Data Acquisition System

  • 33頁

  • ETC

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LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
October 2000
LM81
Serial Interface ACPI-Compatible Microprocessor System
Hardware Monitor
General 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鈥檚 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
鈩?/div>
.
n
Chassis Intrusion detector input
n
WATCHDOG comparison of all monitored values
n
SMBus 1.0 (LM81C) and 1.1 (LM81B) Serial Bus
interface compatibility
n
LM81B has improved voltage monitoring accuracy
n
VID0-VID4 monitoring inputs
Key Specifications
j
Voltage Monitoring Error
j
Temperature Error
+2% or
鹵
1.2% (max)
鈭?0藲C to +125藲C
j
Supply Voltage Range
j
Supply Current
j
ADC and DAC Resolution
j
Temperature Resolution
鹵
3藲C (max)
2.8V to 3.8V
0.4 mA (typ)
8 Bits
0.5藲C
Features
n
Temperature sensing
n
6 positive voltage inputs with scaling resistors to monitor
+5V, +12V, +3.3V, +2.5V, Vccp power supplies directly
n
8-bit DAC output for controlling fan speed
n
2 fan speed monitoring inputs
Applications
n
System Thermal and Hardware Monitoring for Servers
and PCs
n
Office Electronics
n
Electronic Test Equipment and Instrumentation
Typical Application
DS100072-1
#
Indicates Active Low (鈥淣ot鈥?
SMBus
鈩?/div>
is a trademark of the Intel Corporation.
漏 2001 National Semiconductor Corporation
DS100072
www.national.com

LM81CIMTX-3 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 2.5 V, 3.3 V, 5 V, 12 V

  • Active High, Active Low, Open Drain

  • Not Resettable

  • Watchdog

  • No Backup

  • 3.8 V

  • 2.8 V

  • 400 uA

  • + 125 C

  • SMD/SMT

  • TSSOP

  • Reel

  • - 40 C

  • No

  • 2500

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