Texas Instruments TUSB2E221EVM User Manual page 8

Hardware
2.2.2.2 GPIO Repeater Mode
In GPIO repeater mode, the I2C interface is disabled, and signal conditioning settings can be set by modifying
the EQ0, EQ1, and EQ2 pins. These pins are sampled at startup.
Designator
J7
J12
J19
J20
2.2.2.3 UART Mode
In UART mode, the TUSB2E11 acts a 3.3V to 1.2V level shifter to support in-system debug. UART mode can be
set per-port as described in the TUSB2E221 data sheet. In the configuration below, both eUSB-USB ports are
set to UART mode.
Designator
J7
J12
J19
J20
2.2.3 I/O and Interrupts
After the TUSB2E221 has been configured into I2C mode, the EQ0, EQ1, and EQ2/INT pins become
programmable I/O pins. These can be useful in situations where system debug is necessary, or side-band
signaling is needed.
The TUSB2E221 can be configured to use either 1.8V or 1.2V I/O voltages. SW2 on the EVM controls the
VIOSEL pin. To modify the signaling refer to
the EQ0, EQ1, EQ2/INT, SCL and SDA pins.
SW3 position
1-2 (bottom)
2-3 (top)
The TUSB2E221 also has a cross-point mux which allows the eUSB-USB signal path to between Port 0 of the
eUSB port to Port 0 of the USB port as shown in
SW1 position
1-2 (left)
2-3 (right)
8 TUSB2E221 Evaluation Module
Table 2-6. GPIO Repeater Mode Jumper Configuration
Jumper Position
N/A
N/A
N/A
N/A
Table 2-7. UART mode jumper configuration
Jumper Position
1-2
1-2
1-2
1-2
Table 2-8. Changing this setting modifies the threshold voltage of
Table 2-8. TUSB2E221EVM I/O Voltage Switch
Table
Table 2-9. TUSB2E221EVM Mux Configuration
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Description
Set EQ1 to desired signal conditioning settings.
Set EQ0 to desired signal conditioning settings.
Do not populate jumper, SDA floating.
Do not populate jumper, SCL floating.
Description
EQ1 set high
EQ0 set high
SDA pulled high via 1Kohm resistor
SLC pulled high via 1Kohm resistor
I/O voltage
2-9.
eUSB/USB port mapping
eUSB0->USBA | eUSB1->USBB
eUSB0->USBB | eUSB1->USBA
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1.2V
1.8V
SNLU346 – MAY 2024
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