LM80CIMT-5 NSC [National Semiconductor], LM80CIMT-5 Datasheet
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LM80CIMT-5
Manufacturer Part Number
LM80CIMT-5
Description
Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Manufacturer
NSC [National Semiconductor]
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© 2001 National Semiconductor Corporation
LM80
Serial Interface ACPI-Compatible Microprocessor System
Hardware Monitor
General Description
The LM80 provides 7 positive voltage inputs, temperature
measurement, fan speed measurement, and hardware
monitoring on an I
WATCHDOG comparisons of all measured values and an
open-drain interrupt output becomes active when any values
exceed programmed limits. A Chassis Intrusion input is pro-
vided to monitor and reset an external circuit designed to
latch a chassis intrusion event.
The LM80 is especially suited to interface to both linear and
digital temperature sensors. The 10 mV LSB and 2.56 volt
input range is ideal for accepting inputs from a linear sensor
such as the LM50. The BTI is used as an input from either
digital or thermostat sensors such as LM75 and LM56.
The LM80’s 2.8V to 5.75V supply voltage range, low supply
current, and I
applications. These include hardware monitoring and protec-
tion applications in personal computers, electronic test
equipment, and office electronics.
Features
n Temperature sensing
n 7 positive voltage inputs
n 2 programmable fan speed monitoring inputs
n 10 mV LSB and 2.56V input range accepts outputs from
n Chassis Intrusion Detector input
Typical Application
# Indicates Active Low (“Not”)
I 2 C
linear temperature sensors such as the LM50
®
is a registered trademark of the Philips Corporation.
2
C interface make it ideal for a wide range of
2
C
™
interface. The LM80 performs
DS100040
n WATCHDOG comparison of all monitored values
n Separate input to show status in Interrupt Status
n I
n Shutdown mode to minimize power consumption
n Programmable RST_OUT/OS pin: RST_OUT provides a
Key Specifications
j
j
j
j
j
j
Applications
n System Thermal and Hardware Monitoring for Servers
n Office Electronics
n Electronic Test Equipment and Instrumentation
Register of additional external temperature sensors such
as the LM56 or LM75
Reset output; OS provides an Interrupt Output activated
by an Overtemperature Shutdown event
and PCs
2
Voltage monitoring Error
Temperature Error
Supply Voltage Range
Supply Current
ADC Resolution
Temperature Resolution
−25˚C to +125˚C
C Serial Bus interface compatibility
DS100040-1
Shutdown:
Operating:
www.national.com
±
±
0.2 mA typ
June 2001
3˚C (max)
1% (max)
15 µA typ
2.8V to
5.75V
8 Bits
0.5˚C