Datasheet

LM95245
SNIS148G –OCTOBER 2007–REVISED MARCH 2013 www.ti.com
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 LM95245. 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 with a 3 dB
corner frequency of about 40 MHz is included on the LM95245's SMBCLK input. Additional resistance can be
added in series with the SMBDAT 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 SMBDAT and SMBCLK lines.
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