Features: · Accurately senses die temperature of remote ICs or diode junctions
· Offset register allows sensing a variety of thermal diodes accurately
· On-board local temperature sensing
·10 bit plus sign remote diode temperature data format, 0.125 °C resolution
·T_CRIT_A output useful for system shutdown
· ALERT output supports SMBus 2.0 protocol
· SMBus 2.0 compatible interface, supports TIMEOUT
· 8-pin MSOP and SOIC packagesApplication· Processor/Computer System Thermal Management (e.g. Laptop, Desktop, Workstations, Server)
· Electronic Test Equipment
· Office Electronics
Specifications
| Remote Diode Thermal Sensors |
1 |
| Temperature Accuracy (+/-) |
1 deg C |
| Supply Min |
3 Volt |
| Quiescent Current |
1.7 mA |
| Temperature Min |
0 deg C |
| Temperature Max |
125 deg C |
| Interface Type |
2-Wire Serial |
| Programmable Setpoints |
Yes |
| Resolution |
11 bits |
| Resolution degC/LSB |
0.125 |
| Supply Max |
3.6 Volt |
| Shut down |
Yes |
| Interrupt Outputs |
2 |
| Fault Queue |
Yes |
| View Using Catalog |
Supply Voltage .............................................................−0.3 V to 6.0 V
Voltage at SMBData, SMBCLK,
ALERT, T_CRIT_A ............................................................−0.5V to 6.0V
Voltage at Other Pins ............................................................−0.3 V to
(VDD + 0.3 V)
D− Input Current ......................................................................±1 mA
Input Current at All Other Pins (Note2) ....................................±5 mA
Package Input Current
(Note 2) ....................................................................................30 mA
SMBData, ALERT, T_CRIT_A Output
Sink Current ..............................................................................10 mA
Storage Temperature ..........................................................−65°C to
+150°C
Soldering Information, Lead Temperature
SOIC-8 or MSOP-8 Packages
(Note 3)
Vapor Phase (60 seconds) ......................................................215°C
Infrared (15 seconds) .............................................................220°C
ESD Susceptibility (Note 4)
Human Body Model .................................................................2000 V
Machine Model ..........................................................................200 VDescriptionThe LM89 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM89 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode-connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM89 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM89 remote sensor accuracy of ±0.75°C is factory trimmed for the series resistance and 1.0021 typical non-ideality factor of the Intel® Pentium™ 4 and the Mobile Pentium™ 4 Processor-M thermal diode. The LM89 has an Offset register to allow measuring other diodes without requiring continuous software management. Contact hardware.monitor.team@nsc.com to obtain the latest data for new processors.
The LM89 and the LM89-1 have the same functions but different SMBus slave addresses. This allows for one of each to be on the bus at the same time.
Activation of the ALERT# output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A# occurs when any temperature exceeds the T_CRIT programmed limit. The LM89 is pin and register compatible with the LM86, LM90, Analog Devices ADM1032 and Maxim MAX6657/8.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM89-1CIM |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89-1CIMM |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89-1CIMMX |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89-1CIMX |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89CIM |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89CIMM |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89CIMMX |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
| LM89CIMX |
CMOS7 |
0 |
16561 |
0 |
0 |
954000 |
4 |
270700104 |
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 |
|
|
|
| SensorEval Software for Thermal Mangement Products |
6 Kbytes |
15-May-2008 |
View |
|
|
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
More Application Notes
| Title |
Size in Kbytes |
Date |
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| 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 |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
LM89 Data Sheet
