TIDUF48A November   2023  – February 2024 THS6222 , THS6232

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 THVD8000DDF
      2. 2.2.2 THS6222RGTT
      3. 2.2.3 MSPM0G350x
      4. 2.2.4 TPS26624DRCR
      5. 2.2.5 LM5164QDDARQ1
      6. 2.2.6 TPS560430X3FDBVR
      7. 2.2.7 TMUX1204DGSR
    3. 2.3 Design Considerations
      1. 2.3.1 Modulator and Carrier Frequency Selection
      2. 2.3.2 Power Consumption and Gain of the THS6222 Line Driver
      3. 2.3.3 Front End and Discrete Filter
      4. 2.3.4 THVD8000 Schematic
      5. 2.3.5 Board Pinout
  9. 3Hardware, Software, Testing Requirements and Test Results
    1. 3.1 Test Setup
      1. 3.1.1 Powering the TIDA-010935
    2. 3.2 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author
  12. 6Revision History

2.3.1 Modulator and Carrier Frequency Selection

A microcontroller is necessary to operate the TIDA-010935. From the microcontroller, the data requested can be sent across the power line by means of a modulator and a line driver. The TIDA-010935 uses a THVD8000 RS-485 transceiver with OOK modulation scheme as a modulator.

GUID-20231018-SS0I-MXNJ-2RZN-PB7NZMG3LBKM-low.svg
Modulation of the incoming data (D). Signal being produced is a differential signal, coming out of both A and B pins from the THVD8000. A logic high on the data pin results in a 0-V signal, whereas a logic low produces an oscillating signal seen at Vod.
Figure 2-2 OOK Mode

An additional feature of the THVD8000 is the FSET pin, which allows by means of an external resistor, to determine what carrier frequency to use for the modulation and demodulation scheme. The THVD8000 has carrier frequencies ranging from 125 kHz up to 5 MHz in set distances. To allow testing for multiple carrier frequencies in this system, 4 relevant carrier frequencies were selected and can be selected on the software side by means of setting the FSETB0 and FSETB1 values. Table 2-1 shows the available carrier frequencies for the TIDA-010935 and the corresponding resistor value necessary. Table 2-2 shows the necessary FSETB0 and FSETB1 values corresponding to the desired carrier frequency.

Table 2-1 Resistor Values vs Carrier Frequency
RF_SET (kΩ) OOK f0 (kHz)
77 125
19 500
4.4 2000
1.5 5000
Table 2-2 FSET Values vs Carrier Frequency
FSETB0 FSETB1 OOK f0 (kHz)
0 0 125
1 0 500
0 1 2000
1 1 5000