SLVAFF7B December 2022 – November 2024 TPS25762-Q1 , TPS25772-Q1
4CC (4-byte character code) commands are a set of commands that simplify the use of the PD controller's commonly used functions. It allows the user to send a single task that manages more complex subroutines and function specific register writes for them.
The 4CC command structure is similar to a software function, where you have input arguments (Input DATAx), a function call (writing the 4CC command to the CMDx register), and a returned output (Output DATAx).
The 4CC commands that are written to the CMDx register are obtained by converting the 4-character commands to ASCII. You can use an ASCII converter to help you translate the codes (for example, the 4CC command PBMs is converted to 50 42 4D 73). Please keep in mind that the commands are case-sensitive.
The CMD1 (0x08) register will have the 4CC commands written to it over the I2C1 bus. Any Data (Input DATAx, Output DATAx) is written to or read from the DATA1 (0x09) register. There is a second set of registers for the I2C2 bus at 0x10, for CMD2, and 0x11, for DATA2. Table 5-1 provides detailed Unique Address Interface descriptions.
| Register Address | Register Name | Access | Description |
|---|---|---|---|
| 0x03 | MODE | RO | Indicates the operational state of the port. |
| 0x08 | CMD1 | RW | Command register for the primary command interface. If an unrecognized command is written to this register, it is replaced by a 4CC value of "!CMD". |
| 0x09 | DATA1 | RW | Data register for the primary command interface (CMD1). |
| 0x10 | CMD2 | RW | Command register for the secondary command interface. If an unrecognized command is written to this register, it is replaced by a 4CC value of "!CMD". |
| 0x11 | DATA2 | RW | Data register for the secondary command interface (CMD2). |
| 0x14 | INT_EVENT1 | RO | Interrupt event bit field for I2C_EC_IRQ. If any bit in this register is 1, then the I2C_EC_IRQ pin is pulled low. |
| 0x15 | INT_EVENT2 | RO | Interrupt event bit field for I2C2s_IRQ. If any bit in this register is 1, then the I2C2s_IRQ pin is pulled low. |