The ADuM4160 is based on Analog Devices
iCoupler® technology
USB port isolator。 It combines a high-speed CMOS process with monolithic air-core transformer technology to provide excellent operating performance and easy integration with low- and full-speed USB-compatible peripherals.
Many microcontroller implementations of USB only provide D+ and D− lines to external pins. This is desirable in many cases because it requires very few external components and simplifies the design; However, this presents a challenge when isolation is required. The USB line must automatically switch between actively driving D+/D−, receiving data, and allowing an external resistor to set the bus idle state. The ADuM4160 structure senses the direction of the data flow while controlling the state of the output buffer. The direction of data flow is determined on a grouping basis.
The ADuM4160 combines edge detection-based iCoupler technology with internal logic to enable transparent, easy-to-configure, upstream-facing port isolators. Isolated upstream ports offer many advantages such as simple circuitry, power management, and robust operation.
The propagation delay of this isolator is comparable to that of standard hubs and cables. It can operate from a supply voltage of 3.1 V to 5.5 V on either side and internally adjust this voltage to a signal level for direct connection to VBUS. The ADuM4160 isolates the pull-up resistor so that the peripherals can control the connection timing. The device has a low idle current; Suspend mode is required.
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- USB peripheral isolation
- Isolated USB hub