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LM95235 Datasheet(PDF) 24 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM95235
Description  Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM95235 Datasheet(HTML) 24 Page - National Semiconductor (TI)

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3.0 Applications Hints (Continued)
Leakage current between D+ and GND and between D+
and D− should be kept to a minimum. Thirteen nano-
amperes of leakage can cause as much as 0.2˚C of
error in the diode temperature reading. Keeping the
printed circuit board as clean as possible will minimize
leakage current.
Noise coupling into the digital lines greater than 400 mVp-p
(typical hysteresis) and undershoot less than 500 mV below
GND, may prevent successful SMBus communication with
the LM95235. SMBus no acknowledge is the most common
symptom, causing unnecessary traffic on the bus. Although
the SMBus maximum frequency of communication is rather
low (100 kHz max), care still needs to be taken to ensure
proper termination within a system with multiple parts on the
bus and long printed circuit board traces. An RC lowpass
filter witha3dB corner frequency of about 40 MHz is
included on the LM95235’s SMBCLK input. Additional resis-
tance can be added in series with the SMBDAT and SMB-
CLK 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 SMBDAT and SMBCLK lines.

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