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ADT7484AARZ-RL7 Datasheet(PDF) 11 Page - ON Semiconductor |
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ADT7484AARZ-RL7 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 14 page ADT7484A/ADT7486A http://onsemi.com 11 Temperature Offset As CPUs run faster, it is more difficult to avoid high frequency clocks when running the D1+ and D1− tracks around a system board. Even when the recommended layout guidelines are followed, there may still be temperature errors, attributed to noise being coupled on to the D1+ and D1− lines. High frequency noise generally has the effect of producing temperature measurements that are consistently too high by a specific amount. The ADT7484A/ ADT87486A have a temperature offset command code of 0xe0 through which a desired offset can be set. By doing a one−time calibration of the system, the offset caused by system board noise can be calculated and nulled by specifying it in the ADT7484A/ADT7486A. The offset is automatically added to every temperature measurement. The maximum offset is ±128°C with 0.25°C resolution. The offset format is the same as the temperature data format; 16−bit, twos complement notation, as shown in Table 8. The offset should be programmed in little endian format, that is, LSB before MSB. The offset value is also returned in little endian format when read. Application Schematics Figure 17. ADT7484A Typical Application Schematic VCC VCC 1 GND 2 D1+ 3 D1– 4 SST 8 ADD0 7 RESERVED 6 ADD1 5 ADT7484A 2N3904 OR CPU THERMAL DIODE SST Figure 18. ADT7486A Typical Application Schematic VCC 1 2 3 4 VCC GND D1+ D1– D2+ 5 10 9 8 7 RESERVED ADD1 D2– 6 ADT7486A CPU THERMAL DIODE 2N3904 NPN SST SST ADD0 ORDERING INFORMATION Device Order Number* Branding Package Option Package Type Shipping† ADT7484AARZ-REEL − R−8 SOIC−8 NB 2500 Tape & Reel ADT7484AARZ-RL7 − R−8 SOIC−8 NB 1000 Tape & Reel ADT7484AARMZ-RL T20 RM−8 8-Lead MSOP 3000 Tape & Reel ADT7484AARMZ-R7 T20 RM−8 8-Lead MSOP 1000 Tape & Reel ADT7486AARMZ-RL T22 RM−10 10-Lead MSOP 3000 Tape & Reel ADT7486AARMZ-R7 T22 RM−10 10-Lead MSOP 1000 Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *These are Pb−Free packages. |
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