SNLU346 May   2024 TUSB2E221

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Getting Started
    2. 2.2 EVM Configuration
      1. 2.2.1 Power Modes
        1. 2.2.1.1 Self-Powered Configuration
        2. 2.2.1.2 Bus-powered Configuration
        3. 2.2.1.3 External Power
      2. 2.2.2 Functional Modes
        1. 2.2.2.1 I2C-Enabled Repeater Mode
        2. 2.2.2.2 GPIO Repeater Mode
        3. 2.2.2.3 UART Mode
      3. 2.2.3 I/O and Interrupts
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 Board Layout
    3. 3.3 Bill of Materials
  9. 4Additional Information
    1. 4.1 Trademarks

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 Table 3-4 to disable the 3.3V and 1.8V LDOs and allow direct external power.

Table 2-4 EVM External Power Configuration
Designator Installed Description
J1 No VBUS to J5 micro-USB Port A connector
J3 No 5V Rail and DC Jack to VBUS
J6 No VBUS to J10 micro-USB Port B connector
J14 No 5V input to 3.3V LDO
J15 Yes 1.8V supply rail to 1.8V IO rail
J16 No 1.8V LDO output to 1.8V supply rail
J17 No 3.3V supply rail to 1.8V LDO

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.