Datasheet

SM72442
www.ti.com SNVS689H –OCTOBER 2010–REVISED APRIL 2013
Noise coupling into digital lines greater than 400 mVp-p (typical hysteresis) and undershoot less than 500 mV
GND, may prevent successful I2C communication with SM72442. I2C no acknowledge is the most common
symptom, causing unnecessary traffic on the bus although the I2C maximum frequency of communication is
rather low (400 kHz max), care still needs to be taken to ensure proper termination within a system with multiple
parts on the bus and long printed board traces. Additional resistance can be added in series with the SDA and
SCL lines to further help filter noise and ringing. Minimize noise coupling by keeping digital races out of switching
power supply areas as well as ensuring that digital lines containing high speed data communications cross at
right angles to the SDA and SCL lines.
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