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LM81CIMT-31 Datasheet

  • LM81CIMT-31

  • Serial Interface ACPI-Compatible Microprocessor System

  • 32頁

  • NSC

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LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
June 1999
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 vir-
tually any microprocessor-based system. In a PC, the LM81
can be used to monitor power supply voltages, tempera-
tures, and fan speeds. Actual values for these inputs can be
read at any time. Programmable WATCHDOG
鈩?/div>
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
n
n
n
n
2 fan speed monitoring inputs
Chassis Intrusion Detector input
WATCHDOG
鈩?/div>
comparison of all monitored values
SMBus Serial Bus interface compatibility
VID0-VID4 monitoring inputs
Key Specifications
n
Voltage monitoring
Error
n
Temperature Error
鈭?0藲C to +125藲C
n
Supply Voltage Range
n
Supply Current
n
ADC and DAC Resolution
n
Temperature Resolution
Operating:
+2% (max)
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 for
monitoring +5V, +12V, +3.3V, +2.5V, Vccp power
supplies directly
n
8-bit DAC output for controlling fan speed
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?
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
WATCHDOG
鈩?/div>
is a trademark of National Semiconductor Corporation.
SMBus
鈩?/div>
is a trademark of the Intel Corporation.
漏 1999 National Semiconductor Corporation
DS100072
www.national.com

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