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MAX7500-MAX7502 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX7500-MAX7502 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 13 page Applications Information Digital Noise The MAX7500/MAX7501/MAX7502 feature an integrat- ed lowpass filter on both the SCL and the SDA digital lines to mitigate the effects of bus noise. Although this filtering makes communication robust in noisy environ- ments, good layout practices are always recommend- ed. Minimize noise coupling by keeping digital traces away from switching power supplies. Ensure that digital lines containing high-speed data communications cross at right angles to the SDA and SCL lines. Excessive noise coupling into the SDA and SCL lines on the MAX7500/MAX7501/MAX7502—specifically noise with amplitude greater than 400mVP-P (the MAX7500/MAX7501/MAX7502s’ typical hysteresis), overshoot greater than 300mV above +VS , and under- shoot more than 300mV below GND—may prevent suc- cessful serial communication. Serial bus no-acknowl- edge is the most common symptom, causing unneces- sary traffic on the bus. Care must be taken to ensure proper termination within a system with long PC board traces or multiple parts on the bus. Resistance can be added in series with the SDA and SCL lines to further help filter noise and ring- ing. If it proves to be necessary, a 5k Ω resistor should be placed in series with the SCL line, placed as close as possible to SCL. This 5k Ω resistor, with the 5pF to 10pF stray capacitance of the MAX7500/MAX7501/ MAX7502 provide a 6MHz to 12MHz lowpass filter, which is sufficient filtering in most cases. Chip Information TRANSISTOR COUNT: 9611 PROCESS: CMOS Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection ______________________________________________________________________________________ 11 |
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