ADI公司的USB端口隔离方案
2012-11-19
简介:
ADuM4160是一款基于ADI公司iCoupler®技术的USB端口隔离器。它将高速CMOS工艺与单片空芯变压器技术相结合,可提供优异的工作性能,并且很容易与低速和全速USB兼容外设集成。
ADuM4160将基于边沿检测的 iCoupler 技术与内部逻辑结合使用,可实现透明、易于配置、面对上游的端口隔离器。隔离上游端口具有电路简单、电源管理和操作稳健等多种优势。
这款隔离器的传播延迟与标准集线器和电缆的传播延迟相当。它可以采用任一侧的3.1 V至5.5 V电源电压供电,并能在内部将该电压调节至信号电平,从而与VBUS直接相连。ADuM4160对上拉电阻进行隔离控制,以便外设能控制连接时序。该器件的空闲电流较低;需要挂起模式。
特性:
完全兼容USB 2.0
低速和全速数据速率:1.5 Mbps和12 Mbps
双向通信
xD+和xD−线路短路保护功能
3.3 V和5 V(双模电源配置)-欲了解更多信息,请参考数据手册。
3A类接触式ESD性能,符合ANSI/ESD STM5.1-2007标准
工作温度最高可达105℃
高共模瞬变抗扰度:>25 kV/μs
提供评估板
欲了解更多特性,请参考数据手册。
功能图:
方案特点:
The design goals of this evaluation platform are to
• Connect to systems through standard USB Type A and Type B connectors.
• Draw power from the USB host or from an external 5.0 V or 3.3 V power supply.
• Support isolated power for the downstream interface through an ADuM5000 isoPower® dc-to-dc converter.
• Support external downstream power from a 5 V or 3.3 V power supply.
• Provide test points for all power and signal paths.
• Support low and full speed communications.
• Support enumeration control.
• Support external ESD protection.
• Support common-mode chokes in the xD+/xD− lines.
• Support ferrite inductors in the VBUSx and GNDx lines.
Features of the isolator include the following:
• Built-in voltage regulators allow the ADuM4160 and ADuM3160 to draw power from either 5 V or 3.3 V sources.
• Application of the upstream pull-up resistor is under the control of a downstream pin, PIN (Pin 12).
• The operating speed of the isolator is set by pins on the upstream and downstream sides of the part, SPU and SPD (Pin 5 and Pin 13, respectively).
样图:
参考原理图:
参考PCB图:
详情参见:http://www.analog.com/static/imported-files/user_guides/UG-043.pdf