LM86EVAL/NOPB National Semiconductor, LM86EVAL/NOPB Datasheet
LM86EVAL/NOPB
Specifications of LM86EVAL/NOPB
Related parts for LM86EVAL/NOPB
LM86EVAL/NOPB Summary of contents
Page 1
... Simplified Block Diagram Pentium ™ trademark of Intel Corporation. © 2003 National Semiconductor Corporation n On-board local temperature sensing n 10 bit plus sign remote diode temperature data format, 0.125 ˚C resolution n T_CRIT_A output useful for system shutdown n ALERT output supports SMBus 2.0 protocol n SMBus 2 ...
Page 2
Connection Diagram Ordering Information LM86CIMM LM86CIMMX LM86CIM LM86CIMX Pin Descriptions Label Pin # D− 3 T_CRIT_A 4 GND 5 ALERT 6 SMBData 7 SMBCLK 8 www.national.com MSOP-8 or SOIC-8 10130302 TOP VIEW Package NS Package ...
Page 3
Typical Application 3 10130303 www.national.com ...
Page 4
Absolute Maximum Ratings Supply Voltage Voltage at SMBData, SMBCLK, ALERT, T_CRIT_A Voltage at Other Pins D− Input Current Input Current at All Other Pins (Note 2) Package Input Current (Note 2) SMBData, ALERT, T_CRIT_A Output Sink Current Storage Temperature Soldering ...
Page 5
Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for V ≤T ≤ all other limits MIN A MAX A Parameter Local and Remote T_CRIT Default Temperature Setting Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless ...
Page 6
SMBus DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V +3.6 Vdc, C (load capacitance) on output lines = 80 pF. Boldface limits apply for +25˚C, unless otherwise noted. The switching characteristics ...
Page 7
Note 8: Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the internal power dissipation of the LM86 and the thermal resistance. See (Note 5) for the thermal ...
Page 8
Functional Description no longer present, the ALERT is de-asserted (Figure 3). For example, if the ALERT output was activated by the compari- > son of LT LHS, when this condition is no longer true the ALERT will return HIGH. ...
Page 9
Functional Description 1. Master Senses SMBus alert line low 2. Master sends a START followed by the Alert Response Address (ARA) with a Read Command. 3. Alerting Device(s) send ACK. 4. Alerting Device(s) send their Address. While transmitting their ...
Page 10
Functional Description Temperature Digital Output Binary +125˚C 0111 1101 0000 0000 +25˚C 0001 1001 0000 0000 +1˚C 0000 0001 0000 0000 +0.125˚C 0000 0000 0010 0000 0˚C 0000 0000 0000 0000 −0.125˚C 1111 1111 1110 0000 −1˚C 1111 1111 ...
Page 11
Functional Description (a) Serial Bus Write to the internal Command Register followed by a the Data Byte (b) Serial Bus Write to the Internal Command Register (c) Serial Bus Read from a Register with the Internal Command Register preset ...
Page 12
Functional Description a)Step Response FIGURE 9. Digital Filter Response in a Pentium 4 processor System. The filter on and off curves were purposely www.national.com Level 2 sets maximum filtering. ...
Page 13
Functional Description 1.12 Fault Queue In order to suppress erroneous ALERT or T_CRIT triggering the LM86 incorporates a Fault Queue. The Fault Queue acts to insure a remote temperature measurement is genuinely beyond a HIGH, LOW or T_CRIT setpoint ...
Page 14
LM86 REGISTERS Command Select Address Read Address Write Address < > < > P7:P0 hex P7:P0 hex 11h 11h 12h 12h 13h 13h 14h 14h 19h 19h 20h 20h 21h 21h B0h-BEh B0h-BEh BFh BFh FEh NA FFh NA ...
Page 15
LM86 REGISTERS 2.4 CONFIGURATION REGISTER (Read Address 03h /Write Address 09h ALERT mask RUN/STOP Power up default is with all bits “0” (zero) D7: ALERT mask: When set to “1” ALERT interrupts are masked. D6: RUN/STOP: ...
Page 16
... Address FEh) Default value 01h. 2.13 DIE REVISION CODE REGISTER (Read Address FFh) Default value 11hexadecimal or 17 decimal. This register will increment by 1 every time there is a revision to the die by National Semiconductor. 3.0 Application Hints The LM86 can be applied easily in the same way as other integrated-circuit temperature sensors, and its remote diode www ...
Page 17
... Compensating for Diode Non-Ideality In order to compensate for the errors introduced by non- ideality, the temperature sensor is calibrated for a particular processor. National Semiconductor temperature sensors are always calibrated to the typical non-ideality of a given pro- cessor type. The LM86 is calibrated for the non-ideality − ...
Page 18
Application Hints mobile Pentium III processor, 1.008. When a temperature sensor calibrated for a particular processor type is used with a different processor type or a given processor type has a non-ideality that strays from the typical, errors are ...
Page 19
Application Hints (Continued) 3.2 PCB LAYOUT for MINIMIZING NOISE FIGURE 15. Ideal Diode Trace Layout In a noisy environment, such as a processor mother board, layout considerations are very critical. Noise induced on traces running between the remote temperature ...
Page 20
Physical Dimensions unless otherwise noted 8-Lead (0.150" Wide) Molded Narrow Small-Outline Package (SOIC), www.national.com inches (millimeters) JEDEC Registration Number MS-012 Order Number LM86CIM or LM86CIMX NS Package Number M08A 20 ...
Page 21
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...