SLLA595C march   2023  – june 2023 THVD1424 , THVD1454

 

  1.   Abstract
  2.   2
  3.   Trademarks
  4. 1Typical RS-485 Networks and the Need for Termination
  5. 2Network Length, Data Rate, and Stubs
  6. 3Discrete Design for Switchable Termination and Duplex Switching
  7. 4Discrete Design for Duplex Switching
  8. 5 THVD1424 and THVD1454 Flexible RS-485
  9. 6Application Diagrams with THVD1424
  10. 7Experimental Results from Four Node Testing of THVD1424
  11. 8Conclusion
  12. 9Revision History

6 Application Diagrams with THVD1424

Figure 6-1, Figure 6-2, and Figure 6-3 demonstrate the versatility of TI’s Flexible RS-485 transceiver, THVD1424. Network diagrams highlight how THVD1424 fits for both half-duplex and full-duplex networks. Same board design is replicated at all node positions with just software configuration. This also eliminates manual intervention for termination re-configuration as it can be handled by software.

GUID-20221011-SS0I-JLJH-CKH6-MQ6PSG0KRSRQ-low.svg Figure 6-1 Half-duplex Network Using THVD1424
GUID-20221011-SS0I-NF5W-S5GJ-0GZJSHWTWB2P-low.svg Figure 6-2 Full-duplex Network Using THVD1424

THVD1424 only needs two 1 uF bypass capacitors on supply pins, VCC and VIO, to operate, thus providing an extremely compact feature-rich design. All logic pins can be hard-wired to supply or ground and are located in sides of the package. All four bus pins are located on one side of the package to enable a flow-through layout. Three-dimensional image of device with bypass capacitors is shown in Figure 6-3.

GUID-20221011-SS0I-3T2P-TGCK-69LBWK0RDBKH-low.png Figure 6-3 Layout Diagram of THVD1424