Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface |
168
Kbytes |
2-Mar-01 |
Download |
LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface (Japanese)
 |
176 Kbytes |
|
 |
Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LM84CIMQA
| NONE
| NONE
| 04 Mar 2003
|
LM84CIMQAX
| NONE
| NONE
| 04 Mar 2003
|
General Description
The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface. The LM84 senses its own temperature as well as the temperature of a target IC with a diode junction, such as a Pentium® II processor or a diode connected 2N3904. A diode junction (semiconductor junction) is required on the target IC's die. A host can query the LM84 at any time to read the temperature of this diode as well as the temperature state of the LM84 itself. A T_CRIT_A# interrupt output becomes active when the temperature is greater than a programmable comparator limit, T_CRIT.
The host can program as well as read back the state of the T_CRIT register. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM84. The sensor powers up with default thresholds of 127°C for T_CRIT.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM84BIMQA | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519
|
|
LM84BIMQAX | 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 |
|
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 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
|
| 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 |
[Information as of 8-Nov-2009]
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