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MAX487: FAQ
MAX487: FAQ
MAX487
Interface Transceivers & Isolators
Created
over 8 years ago
Updated
10 days ago
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MAX487的RS-485接收器能够在电缆开路时保持正确的MARK状态，但在电缆短路时不能始终保持正确的MARK状态，如何保证接收器在电缆开路和短路时都能保持正确的状态?
与许多RS-485收发器设计类似，MAX487能够检测电缆开路但不能检测电缆短路。新一代收发器经过改进后能够处理短路和开路情况。例如，MAX3471与MAX487引脚兼容，但新型MAX3471能够实现真正的失效保护，可以用这些新型器件作为替代产品。 MAX487通过在接收器的输入引脚A施加一个较低的偏置电压检测电缆开路状态。如果没有连接匹配电阻，将使接收器的差分输入恰好偏置在与有效的驱动器提供的MARK状态相同的电压…
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