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DS90UB949-Q1 HPD信号问题

Other Parts Discussed in Thread: DS90UB949-Q1

TI工程师你好, 我们的项目里DS90UB949-Q1的HPD信号一直没有输出,能通过I2C读取到DS90UB949-Q1芯片的ID,请问HPD无信号是什么原因?附件是原理图