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System Management Bus
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====Sink Current (''I<sub>OL</sub>'')==== SMBus 2.0 defines a ‘High Power’ class that includes a 4 mA sink current that cannot be driven by I²C chips unless the pull-up resistor is sized to I²C-bus levels. NXP devices have a higher power set of electrical characteristics than SMBus 1.0. The main difference is the current sink capability with ''V<sub>OL</sub>'' = 0.4 V. *SMBus low power = 350 μA *SMBus high power = 4 mA *I²C-bus = 3 mA SMBus ‘high power’ devices and I²C-bus devices will work together if the pull-up resistor is sized for 3 mA.
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