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USB bridge circuit gating RID—A and RID—GND for IDGND
USB bridge circuit gating RID—A and RID—GND for IDGND
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机译:USB桥接电路选通RID — Sub> A和RID — Sub> GND用于IDGND
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摘要
A physical layer integrated circuit (PHY), including an accessory charger adapter (ACA) bridge circuit to communicate with an ACA via a universal serial bus (USB) cable having at least an ID pin and a VBUS pin. The PHY is also to communicate with an ACA-agnostic USB controller configured to act as an A-device or as a B-device. The ACA includes a USB accessory port. The ACA bridge circuit includes detection and control logic configured to detect, based on a resistance sensed on the ID pin, that a B-device is connected to the USB accessory port of the ACA and, as a result of such a detection, generate a signal to the USB controller that causes the USB controller to act as an A-device and ignore a VBUS drive signal from the USB controller.
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