The TPS25751 is a highly integrated stand-alone USB Type-C® and Power Delivery (PD) controller optimized for applications supporting USB-C PD Power. In general, the TPS25751 loads the patch file by EEPROM initially when powering on the device. If there is no EEPROM, the system needs to use EC (Embedded Controller) to issue patch file to I2Ct. The TPS25751 Technical Reference demonstrates the flow for Pushing a Patch Bundle Over the I2Ct Bus to Multiple PD Controllers at the same time, but can be hard to understand. This application note demonstrates the step-by-step explanation for PTCH mode to APP mode transition by using I2C command through I2Ct and also shows the commonly used function in TPS25751.
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The application note focuses on using EC to issue 4CC commands to TPS25751 through I2Ct from PTCH mode to APP mode. Before the action, the article introduces the ADCINX configuration and dead battery configuration which are related to the TPS25751 initial configurations. After entering into the APP mode, there are some common used function for TPS25751 like I2Ct setting and GPIO setting.