Other Parts Discussed in Thread: TUSB2E22
Tool/software:
The TUSB2E221 is the latest 2-port eUSB2 repeater. Released in 2024, it contains updates that allow it to conform to the latest eUSB2 v1.2 specification as well as adding many new features that were unavailable in the TUSB2E22:
- Support for eUSB2 auto-resume ECR as well as L2 interrupt resume mode
- Compliance to eUSB2 revision 1.2 specification
- Selection between 1.2V and 1.8V I/O control or I2C levels using VIOSEL pin
- I2C device interface for more configurations and debug capabilities
- CTA-936 USB Carkit UART support
- Optional BC1.2 CDP battery charging and detection support
To take advantage of these new features some changes are required in existing designs transitioning from the TUSB2E22 to the TUSB2E221 repeater using the WCSP (YCG) package.
|
Pin Name |
TUSB2E22 |
TUSB2E221 |
Transition Guide |
|
A2 |
Reserved |
SDA |
I2C communication is enabled. Add I2C control. |
|
A3 |
Reserved |
SCL |
I2C communication is enabled. Add I2C control. |
|
C3 |
VDD1V8 |
VIOSEL |
No change if 1.8V I/O is desired. To update I/O voltage to 1.2V, tie to GND. |
|
A4 |
Reserved |
EQ2/INT |
Can leave floating. Route to APU for added interrupt capabilities. |
|
E2 |
EQ0 |
EQ0 |
Pull low to enable eUSB2 repeater mode for port 0. Pull high if UART mode is required. |
|
E3 |
EQ1 |
EQ1 |
Pull low to enable eUSB2 repeater mode for port 1. Pull high if UART mode is required. |
When SDA and SCL are pulled high in the TUSB2E221, I2C mode is enabled and EQ settings are controlled through I2C configuration. If the new design does not require I2C communication, the TUSB2E221 can be configured in GPIO mode. The required changes are listed in Table 5-2 of the TUSB2E221 datasheet and are based on system needs.
|
SCL |
SDA |
TUSB2E221 Behavior |
|
Low/Float |
Low/Float |
GPIO mode; EQ0 and EQ1 control USB2 PHY Configuration. |
|
Low/Float |
High |
GPIO mode; EQ0 and EQ1 control USB2 PHY Configuration. CDP advertising enabled. |
|
High |
Low/Float |
GPIO mode; EQ0 and EQ1 control eUSB2 PHY Configuration. |
When SCL or SDA is pulled low, the TUSB2E221 behaves similarly to the TUSB2E22 and minimal design changes are required.