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LM81BIMT-3 Datasheet

  • LM81BIMT-3

  • DATA ACQ SYSTEM|6-CHANNEL|8-BIT|TSSOP|24PIN|PLASTIC

  • 33頁

  • ETC

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LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
February 2002
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, tem-
peratures, 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?
漏 2002 National Semiconductor Corporation
DS100072
www.national.com

LM81BIMT-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

  • Tube

  • - 40 C

  • No

  • 61

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