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SN65LVCP204的VBB问题请教

Other Parts Discussed in Thread: SN65LVCP404

看芯片datasheet知道VBB是输入引脚,是提供直流偏置电压的,我理解是外部输入1.6V。但实测发现没有任何外部输入的情况下,可以测量到VBB有1.6V的输出。这意思是说芯片内部已经有这个直流偏置电压了?是否是不需要外部供给1.6V呢?

谢谢!