SPRAC94D September   2018  – March 2022 AFE030 , AFE031 , TMS320F28075 , TMS320F28075-Q1 , TMS320F28076 , TMS320F28374D , TMS320F28374S , TMS320F28375D , TMS320F28375S , TMS320F28375S-Q1 , TMS320F28376D , TMS320F28376S , TMS320F28377D , TMS320F28377D-EP , TMS320F28377D-Q1 , TMS320F28377S , TMS320F28377S-Q1 , TMS320F28379D , TMS320F28379D-Q1 , TMS320F28379S

 

  1.   Trademarks
  2. 1 FSK Overview
  3. 2 Hardware Overview
    1. 2.1 Block Diagram
    2. 2.2 Hardware Setup
  4. 3 Interfacing With the AFE03x
    1. 3.1 Configuring the AFE031
  5. 4 Transmit Path
    1. 4.1 FSK Example Specifications
    2. 4.2 PWM Mode
      1. 4.2.1 Software Implementation
      2. 4.2.2 Testing Results
      3. 4.2.3 HRPWM vs. EPWM
    3. 4.3 DAC Mode
      1. 4.3.1 Software Implementation
      2. 4.3.2 Testing Results
      3. 4.3.3 OFDM Ability
    4. 4.4 Porting TX to LAUNCHXL-F280049C
      1. 4.4.1 PWM Mode Specific Porting
      2. 4.4.2 DAC Mode Specific Porting
  6. 5 Receive Path
    1. 5.1 Receive Path Overview
    2. 5.2 Receiver Software Implementation
      1. 5.2.1 Initial Setup and Parameters
      2. 5.2.2 Interrupt Service Routines
      3. 5.2.3 Run Time Operation
      4. 5.2.4 Testing Results
      5. 5.2.5 System Utilization
      6. 5.2.6 Device Dependency and Porting
    3. 5.3 Tuning and Calibration
      1. 5.3.1 Setting the AFE03X's PGAs
      2. 5.3.2 Automatic Gain Control (AGC)
      3. 5.3.3 Setting the Bit Detection Threshold
      4. 5.3.4 FSK Correlation Detector Library
    4. 5.4 Porting RX to LAUNCHXL-F280049C
  7. 6 Interfacing With a Power Line
    1. 6.1 Line Coupling
    2. 6.2 Coupling to an AC Line
      1. 6.2.1 Low Voltage Capacitor
      2. 6.2.2 The Ratio of the Transformer
      3. 6.2.3 HV Capacitor
      4. 6.2.4 HV Side Inductor
    3. 6.3 Coupling to DC Line
    4. 6.4 Protection Circuit
      1. 6.4.1 Metal Oxide Varistors
      2. 6.4.2 Transient Voltage Suppressors
      3. 6.4.3 Current Steering Diodes
    5. 6.5 Determining PA Power Supply Requirements
  8. 7 Summary
  9. 8 References
  10. 9 Schematics
    1. 9.1 Schematics (PWM Mode)
    2. 9.2 Schematics (DAC Mode)
  11. 10Revision History

6.4 Protection Circuit

Powerline communications are often located in operating environments that are harsh for electrical components connected to the ac line. Noise or surges from electrical anomalies such as lightning, capacitor bank switching, inductive switching, or other grid fault conditions can damage high-performance integrated circuits if they are not properly protected. The AFE031 can survive even the harshest conditions if several recommendations are followed: metal-oxide varistors (MOVs), transient voltage suppression diodes (TVSs), Schottky diodes, and a Zener diode.

GUID-0C36FE1C-D4A2-4141-879F-E267269176AB-low.gifFigure 6-4 Recommended Transient Protection