Texas Instruments TUSB2E221EVM User Manual page 6

Hardware
Designator
J1
J3
J6
J14
J15
J16
J17
After configuring the EVM, plug the DC adapter into the DC jack at J2 on the EVM. Using this method to provide
power is useful while the TUSB2E221 is configured as either a self-powered device or a host.
2.2.1.2 Bus-powered Configuration
When VBUS is provided through the micro-USB connector, the TUSB2E221EVM does not require an external
5V supply. Make sure that 5V is not already being provided to the EVM through other sources by configuring the
EVM headers as shown in
Designator
J1
J3
J6
J14
J15
J16
J17
After configuring the EVM, plug the USB host into either the J1 or J6 micro-USB connector. Using this method to
provide power is useful while the TUSB2E221 is configured as a bus-powered device.
2.2.1.3 External Power
Alternately to providing a 5V power source to the TUSB2E221EVM, a 3.3V and 1.8V power supply can be
provided directly to the TUSB2E221 device.
Before providing power to the EVM, make sure that power is not already being provided through the USB bus or
DC power jack. Configure the EVM jumpers as shown in
direct external power.
Designator
J1
J3
J6
J14
J15
J16
J17
After configuring the EVM, attach the 3.3V power supply to pin 1 of J14, and attach 1.8V pin 1 of J16. Using
this method to provide power is useful when evaluating the power consumption of the TUSB2E221. Current and
voltage measurements can be made on the 3.3V and 1.8V rails provided to the EVM.
6 TUSB2E221 Evaluation Module
Table 2-2. EVM Wall Power Configuration
Installed Description
No VBUS to J5 micro-USB Port A connector
Yes 5V Rail and DC Jack to VBUS
No VBUS to J10 micro-USB Port B connector
Yes 5V input to 3.3V LDO
Yes 1.8V supply rail to 1.8V IO rail
Yes 1.8V LDO output to 1.8V supply rail
Yes 3.3V supply rail to 1.8V LDO
Table 2-3.
Table 2-3. EVM Bus Power Configuration
Installed Description
Yes VBUS to J5 micro-USB Port A connector
No 5V Rail and DC Jack to VBUS
Yes VBUS to J10 micro-USB Port B connector
Yes 5V input to 3.3V LDO
Yes 1.8V supply rail to 1.8V IO rail
Yes 1.8V LDO output to 1.8V supply rail
Yes 3.3V supply rail to 1.8V LDO
Table 2-4. EVM External Power Configuration
Installed Description
No VBUS to J5 micro-USB Port A connector
No 5V Rail and DC Jack to VBUS
No VBUS to J10 micro-USB Port B connector
No 5V input to 3.3V LDO
Yes 1.8V supply rail to 1.8V IO rail
No 1.8V LDO output to 1.8V supply rail
No 3.3V supply rail to 1.8V LDO
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Table 2-4 to disable the 3.3V and 1.8V LDOs and allow
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SNLU346 – MAY 2024
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