PTN3222CUK-EVB使用咨询

[ZhirongRao]

您好：

        我想了解一下PTN3222CUK-EVB的功能。我现在有一个eUSB设备，希望通过PTN3222CUK-EVB将eUSB信号转为USB2.0与PC通信。但我不了解PTN3222CUK-EVB是应该如何使用。比如PTN3222CUK-EVB是怎么知道自己是host repeater还是peripheral repeater的？
我的应用框图如下：

若想要PTN3222正常工作，流程是否如下所示：

1、在进行eUSB通信之前，需要MCU(eUSB设备端)通过I2C给PTN3222下命令，让PTN3222进入peripheral repeater；

2、PTN3222的USB2.0接口插入电脑；PC USB2.0 发起sof包，PTN3222将SOF包转为eUSB信号发送给MCU(eUSB设备)，同时MCU(eUSB设备)识别到此信号，并回PTN3222对应的波形；

期待您的回复，祝您生活愉快！

[TomasVaverka · Accepted solution]

Hello,

It does not “auto‑sense” the role. The role is chosen by the application, either by I²C register configuration or by the eUSB2 Port Configuration command. The EVB makes this easy via its I²C header. By default after reset, the device comes up in Peripheral role and can transition under control of the state machine.

Yes. That is a recommended step (even though the EVB’s factory default is peripheral). Also configure SI settings as needed.

Yes, conceptually correct. In practice, there is the usual USB2 attach → reset → (optional) HS chirp negotiation → enumeration → SOF sequence and PTN3222 simply level‑shifts/conditions signals both ways throughout.

BRs, Tomas