SLLU380 March   2024 THVD4411

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1  Power Requirements
    2. 2.2  Board Setup and Operation
    3. 2.3  Header and Jumper Information
    4. 2.4  Resistor Information
    5. 2.5  Capacitor Information
    6. 2.6  LED Information
    7. 2.7  IC Information
    8. 2.8  Test Points
    9. 2.9  Assembly Instructions
    10. 2.10 Best Practices
  9. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  10. 4Additional Information
    1. 4.1 Known Hardware or Software Issues
    2. 4.2 Trademarks
  11. 5Related Documentation
    1. 5.1 Supplemental Content

2.1 Power Requirements

Single Supply Operation (Logic Supply Equals Main Voltage Supply)

The THVD4411 Transceiver in the RGE package from TI has an additional logic supply pin, VIO. This is used to power the internal digital logic circuits inside of the device. In single supply operation mode for the THVD4421RGE, the VIO pin must be shorted to VCC by shorting the header pins of J3, so that the digital circuits are properly powered.

Table 2-1 Single Supply Operation
Component ID Comment
J1 VCC Power Terminal – attach voltage source of 3V to 5.5V to terminal block.
J2 VIO Power Terminal – leave open for single supply operation.
J3 Shunted for single supply operation.
J4 Shunted for applications with no separation between EARTH and GND.

To apply power onto the board, VCC is applied through the J1 terminal. With the board oriented with J1 on the top left side of the board, as shown in figure 1.1, the signals are, from right to left, VCC, GND, EARTH. The EARTH and GND distinction are used to help the end user determine operational qualities with respect to ground potential differences. If testing methods on reducing ground loop current install a resistor on pad R1. For applications without a separate EARTH connection EARTH and GND can be shorted together via jumper J4. Bulk supply decoupling capacitors can be found on near J1 and J2 – high frequency decoupling capacitors exist closer to IC and are pre-installed.

Dual Supply Operation (Separate Digital Logic and Driver Supplies)

The THVD4411 Transceiver in the RGE package from TI has an additional logic supply pin, VIO. This is used to power the internal digital logic circuits inside of the device. In dual supply operation, the digital circuit supply, VIO, supplies the logic signal pins (L1 – L2) and the control signal pins (SLR, DIR, M0, M1, TERM_TX, TERM_RX, and /SHDN). This supply can operate from 1.65V to 5.5V to allow controllers to communicate with the transceiver at 2.5V and 1.8V logic levels. J3 must be left open for dual supply operation.

Table 2-2 Dual Supply Operation
Component ID Comment
J1 VCC Power Terminal – attach voltage source of 3V to 5.5V to terminal block.
J2 VIO Power Terminal – attach voltage source of 1.65V to 5.5V to terminal block.
J3 Left open for dual supply operation.
J4 Shunted for applications with no separation between EARTH and GND.

Powering the board up is similar to single supply operation. J1 is powered as described in Table 3-1. Using the same orientation as before (J1 at top left of the board), the inputs for the VIO power terminal (J7) are similar VCC (J6); from right to left is VIO, GND, EARTH. Bulk supply decoupling capacitors can be found near J1 and J2. For applications without a separate EARTH connection, GND and EARTH can be shorted by shunting J4.