当前5G-EVB项目使用HD3SS3220IRNHT芯片,目前在验证OTG功能
发现插入OTG设备到Type-C接口,CC脚是可以拉低的,但此端口扩展芯片的ID引脚无法输出低电平,
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您好,910Kohm电阻没问题。 如果ID为low的话,需要Vbus电压在Vsafe0V(小于0.8V),当Vbus电压处于Vsafe0V的时候,ID 才会输出低电平。
Upon detecting a UFP device, HD3SS3220 will keep ID pin high if VBUS is not at VSafe0V. Once VBUS is at VSafe0V, the HD3SS3220 will assert ID pin low. This is done to enforce Type-C requirement that VBUS must be at VSafe0V before re-enabling VBUS.