| 摘要 |
A dual-wire communications bus circuit, compatible with existing two-wire protocols, includes a first and second part of the communications bus circuit to couple to a communications bus. The bus has a first line for carrying data signals from a master device to a slave device and a second line to carry a clock signal between the devices. To improve data throughout and reduce noise, an active pullup device is located in at least one part of the communications bus circuit, the active pullup device in the first part of the of the communications bus circuit couples to the first line and an optional active pullup device in the second part couples to the second line of the communications bus. Each active pullup device may provide a high logic level on one of the communications bus lines.
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