SLLA635 May   2024 THVD4411 , THVD4421 , THVD4431

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Application Use-Case of Multiprotocol Transceivers
  6. 3 Key Design Goals of a Versatile Multiprotocol Transceiver
  7. 4 Discrete Multiprotocol Transceiver Implementation
  8. 5 TI's THVD44xx Multiprotocol Transceiver Family
  9. 6 MODE Configurations for THVD4431
  10. 7 Application Diagrams for THVD4431
  11. 8 Waveforms for THVD4431
  12. 9 Benefits of THVD4431 Over Competition Devices
  13. 10Conclusion

5 TI's THVD44xx Multiprotocol Transceiver Family

Texas Instruments has released a family of Multiprotocol transceivers THVD44xx. All three devices in this family are for single communication port needing one interface (RS-232 or RS-422/RS-485) at a time via shared bus/logic lines.

THVD4431: three transmitters and five receivers for RS-232, one transmitter and one receiver for RS-485 in 40-QFN (6mm*6mm).

THVD4421: two transmitters and two receivers for RS-232, one transmitter and one receiver for RS-485 in 32-QFN (5mm*5mm).

THVD4411: one transmitter and one receiver for RS-232, one transmitter and one receiver for RS-485 in 24-QFN (4mm*4mm).

Figure 5-1 through Figure 5-3 show the block diagrams for each of the device. For more details into the pinout, functionality and application schematic, see the device-specific data sheets.

THVD4431 Block Diagram Figure 5-1 THVD4431 Block Diagram
THVD4421 Block Diagram Figure 5-2 THVD4421 Block Diagram
THVD4411 Block Diagram Figure 5-3 THVD4411 Block Diagram

Below features are common to all three devices:

  • Integrated Level-4 (8kV contact discharge, 15kV air-gap discharge) IEC-ESD protection (per IEC 61000-4-2) on all bus pins.
  • Integrated 120-Ω switchable termination on both RS-485 driver and RS-485 receiver bus pins. These can be engaged ON/OFF from TERM_TX/TERM_RX pins providing complete flexibility to the system designer to use the device on any node (middle or end) in any type of network (half duplex or full duplex).
  • Integrated high-efficiency low-noise charge pump for driving RS-232 voltage levels. This charge pump produces regulated ±5.5V (nominal) output from 3.3VCC, or ±9V (nominal) from 5VCC.
  • Ultra-low power shutdown mode where all blocks are switched off and device consumes less than 20uA of leakage current.
  • Slew rate control for RS-232 and RS-485 that enables same device to be used in two max signaling rate scenarios.
  • Logic supply (1.65V to 5.5V) support to enable different MCU interface supply and bus supply voltages.
  • Ample configuration options such as RS-485 half duplex mode, RS-485 full-duplex mode, RS-422 mode, RS-232, and some devices have diagnostic loopback modes as well.
  • Extended ambient temperature range supported: -40°C to 125°C
  • Integrated protection features such as RS-485 and RS-232 driver short-circuit, RS-485 receiver failsafe operation, under-voltage and thermal shutdown to enable robust operation.
  • Space-saving thermally efficient QFN package.