Pinout
Specifications| Temperature Accuracy (+/-) | 1 deg C |
| Supply Min | 4.5 Volt |
| Quiescent Current | 0.45 mA |
| Temperature Min | -55 deg C |
| Temperature Max | 150 deg C |
| Interface Type | 2-Wire Serial |
| Programmable Setpoints | Yes |
| Resolution | 13 bits |
| Resolution degC/LSB | 0.0625 |
| Supply Max | 5.5 Volt |
| Shut down | Yes |
| Interrupt Outputs | 2 |
| Fault Queue | Yes |
| Automotive Selection Guide | Yes |
| View Using Catalog |
DescriptionThe LM76 is a digital temperature sensor and thermal window comparator with an I2C™ Serial Bus interface with an accuracy of ±1°C. This accuracy for the LM76CHM is specified for a -10°C to 45°C temperature range, while for the LM76CNM the temperature range is 70°C to 100°C. The LM76CHM is specified with an accuracy ±0.5°C at 25°C. The window-comparator architecture of the LM76 eases the design of temperature control systems conforming to the ACPI (Advanced Configuration and Power Interface) specification for personal computers. The open-drain Interrupt (INT) output becomes active whenever temperature goes outside a programmable window, while a separate Critical Temperature Alarm (T_CRIT_A) output becomes active when the temperature exceeds a programmable critical limit. The INT output can operate in either a comparator or event mode, while the T_CRIT_A output operates in comparator mode only.
The host can program both the upper and lower limits of the window as well as the critical temperature limit. Programmable hysterisis as well as a fault queue are available to minimize false tripping. Two pins (A0, A1) are available for address selection. The sensor powers up with default thresholds of 2°C THYST, 10°C TLOW, 64°C THIGH, and 80°C T_CRIT.
The LM76's 3.3V and 5.0V supply voltage, Serial Bus interface, 12-bit + sign output, and full-scale range of over 127°C make it ideal for a wide range of applications. These include thermal management and protection applications in personal computers, electronic test equipment, office electronics and bio-medical applications.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM76CHM-5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
| LM76CHMX-5 |
CS065 |
2 |
34108 |
59 |
0 |
3862000 |
1 |
1095853045 |
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 |
|
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| 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 |
|
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
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 |
Download |
| AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems |
66 Kbytes |
1-Oct-02 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
LM76 Data Sheet
