TUSB8043AI datasheet(22/56 Pages) TI1

22 / 56 page

TUSB8043A

SLLSF94 – JUNE 2019

www.ti.com

Product Folder Links: TUSB8043A

Submit Documentation Feedback

8.4 Device Functional Modes

8.4.1 External Configuration Interface

The TUSB8043A supports a serial interface for configuration register access. The device may be configured by

an attached I2C EEPROM or accessed as a slave by an external SMBus master. The external interface is

enabled when both the SCL/SMBCLK and SDA/SMBDAT pins are pulled up to 3.3 V at the de-assertion of reset.

The mode, I2C master or SMBus slave, is determined by the state of SMBUSz/SS_SUSPEND pin at reset. With

the integrated USB HID to I2C master, the I2C interface can also be used to program an external EEPROM or

perform updates of an external MCU's firmware.

8.4.2 I2C EEPROM Operation

The TUSB8043A supports a single-master, standard mode (100 KHz) or fast mode (400KHz) connection to a

dedicated I2C EEPROM when the I2C interface mode is enabled. In I2C mode, the TUSB8043A reads the

contents of the EEPROM at bus address 1010000b using 7-bit addressing starting at address 0. The

TUSB8043A reads the entire EEPROM contents using a single burst read transaction. The burst read transaction

ends when the address reaches FFh.

If the value of the EEPROM contents at address byte 00h equals 55h, the TUSB8043A loads the configuration

registers according to the EEPROM map. If the first byte is not 55h, the TUSB8043A exits the I2C mode and

continues execution with the default values in the configuration registers. The hub is not connect on the upstream

port until the configuration is completed.

NOTE

The bytes located above offset Ah are optional. The requirement for data in those

addresses is dependent on the options configured in the Device Configuration, and Device

Configuration 2 registers.

The minimum size I2C EEPROM required is 2Kbit.

For details on I2C operation refer to the UM10204 I2C-bus Specification and User Manual.

8.4.3 Port Configuration

The TUSB8043A port configurations can be selected by registers or efuse. The Port Used Configuration register

(USED[3:0]) define how many ports can possibly be reported by the hub. The device removable configuration

or not. The USB 2.0 Only Port register (USB2_ONLY[3:0]) define whether or not a used port is reported as part

of the USB 2.0 hub or both the USB2.0 and SS hubs. The USB2_ONLY field enables the USB2.0 port even if the

corresponding USED bit is low. The internal HID port will always be the highest number USB2.0 port. Table 5

shows examples of the possible combinations.

TUSB8043AI 数据表(PDF) 22 Page - Texas Instruments

TUSB8043AI 数据表(HTML) 22 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

数据表下载