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[FAQ] TUSB2E221: How do I update my PCB design from using the TUSB2E22 to the TUSB2E221?

Part Number: TUSB2E221
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.