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LM83 Datasheet(PDF) 19 Page - Texas Instruments |
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LM83 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 22 page  4.0 Application Hints (Continued) 6. Avoid running diode traces close to or parallel to high speed digital and bus lines. Diode traces should be kept at least 2cm. apart from the high speed digital traces. 7. If it is necessary to cross high speed digital traces, the diode traces and the high speed digital traces should cross at a 90 degree angle. 8. The ideal place to connect the LM83’s GND pin is as close as possible to the Processors GND associated with the sense diode. For the Pentium II this would be pin A14. 9. Leakage current between D+ and GND should be kept to a minimum. One nano-ampere of leakage can cause as much as 1˚C of error in the diode temperature read- ing. Keeping the printed circuit board as clean as pos- sible will minimize leakage current. Noise coupling into the digital lines greater than 300mVp-p (typical hysteresis), overshoot greater than 500mV above V CC, and undershoot less than 500mV below GND, may pre- vent successful SMBus communication with the LM83. SM- Bus no acknowledge is the most common symptom, causing unnecessary traffic on the bus. Although, the SMBus maxi- mum frequency of communication is rather low (100kHz max) care still needs to be taken to ensure proper termina- tion within a system with multiple parts on the bus and long printed circuit board traces. An R/C lowpass filter with a 3db corner frequency of about 40MHz has been included on the LM83’s SMBCLK input. Additional resistance can be added in series with the SMBData and SMBCLK lines to further help filter noise and ringing. Minimize noise coupling by keeping digital traces out of switching power supply areas as well as ensuring that digital lines containing high speed data communications cross at right angles to the SMBData and SMBCLK lines. 4.0 Typical Applications DS101058-17 FIGURE 10. Ideal Diode Trace Layout DS101058-22 FIGURE 11. LM83 Demo Board Diode Layout www.national.com 18 |
Similar Part No. - LM83_15 |
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Similar Description - LM83_15 |
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