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TPS65987D: What is the difference between TPS65987DDJ and TPS65987DDH

Part Number: TPS65987D

Hello:

          I2CConfig.pjtNow we are making a full-function typec interface board. During the test, we found that TPS65987DDH can work normally, but TPS65987DDJ cannot recognize the hotplug of the display, that is, the access to the dp display hotplug has been low, I don't know why.

  • Hello,

    The internal rom for the TPS65987DDH and TPS65987DDJ is different. The DJ ROM is intended for applications that use a thunderbolt controller. You cannot use the same firmware image and project file for both devices as they require their own project and binary image generated using the proper configuration tool

  •               Oh, it turns out that this is the case. I still want to ask if the CC protocol supports the hutplug detection of DP display. At present, we have made a batch of boards that are posted with DJ versions. I tested USB3.0 without any problems. It is recognizable, but hotplug cannot be recognized.

    Thanks.

  • Yes, as long as your DP configuration is correct then HPD should be working fine. Check to make sure that you are negotiating a DP alternate mode. There is an auto negotiate bit within the DP register. Enable this bit if you not already done so. Also, make sure that if you are doing a physical HPD, that you have a corresponding GPIO set to an HPD event to notify a downstream device.