Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor |
417 Kbytes |
22-Feb-02 |
Download |
LM81 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor (Japanese)
 |
331 Kbytes |
|
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Package Availability, Models, Samples & Pricing
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'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.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM81BIMT-3 | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519
|
|
LM81BIMTX-3 | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519
|
|
LM81CIMT-3 | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519
|
|
LM81CIMTX-3 | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519
|
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Design Tools
| Title | Size in Kbytes |
Date |
 |
|
|
| LMxx - Windows 95/98 VXD drivers with stand alone application for talking to temperature sensors or hardware monitors on a mother board |
1366 Kbytes |
28-Jul-2003 |
View |
Download |
|
More Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8 |
82 Kbytes |
15-May-04 |
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| AN-1260: Application Note 1260 Autonomous Fan Control for Processor Systems Using the LM85 |
74 Kbytes |
10-Mar-04 |
Download |
| AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor |
70 Kbytes |
1-Oct-02 |
Download |
| AN-1784: Application Note 1784 LMV1022 / LMV1023 Digital Output PDM Microphone Amplifier Demo Board User's Guide |
3786 Kbytes |
6-Mar-08 |
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[Information as of 8-Nov-2009]
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