SNLU354 November   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. 4.2 Related Documentation

2.2.1.3 External Power

Alternately to providing a 5V power source to the TUSB2E221QFNEVM, 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 2-4 to disable the 3.3V and 1.8V LDOs and allow direct external power.

Table 2-4 EVM External Power Configuration
DesignatorInstalledDescription
J3NoVBUS to J4 Port A connector
J2No5V Rail and DC Jack to VBUS
J10NoVBUS to J4 USB Port B connector
J14No3.3V LDO to 3.3V
J15Yes3.3V supply rail to 1.8V input
J16No1.8V LDO output to 1.8V supply rail
J17No1.8V supply rail to 1.8V IO

After configuring the EVM, attach the 3.3V power supply to pin 1 of J14, then attach the 1.8V supply to pin 1 of J16. This method of providing 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.