TIDUFE6A September   2025  – December 2025

 

  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 Design Considerations
      1. 2.2.1 Control Pilot
        1. 2.2.1.1 Signals
        2. 2.2.1.2 Duty Cycle
        3. 2.2.1.3 Signal State
        4. 2.2.1.4 Control Pilot Signal Circuit
        5. 2.2.1.5 EV Simulation Circuit
      2. 2.2.2 HomePlug Green PHY - Powerline Communication
        1. 2.2.2.1 HomePlug Green PHY Circuit
      3. 2.2.3 Proximity Pilot
        1. 2.2.3.1 Type 1 and NACS
        2. 2.2.3.2 Type 2
        3. 2.2.3.3 Proximity Detection Circuit
      4. 2.2.4 GB/T – ChaoJi
        1. 2.2.4.1 Signals
        2. 2.2.4.2 GB/T
        3. 2.2.4.3 ChaoJi
        4. 2.2.4.4 Schematics
        5. 2.2.4.5 EV Simulation
      5. 2.2.5 CHAdeMO
        1. 2.2.5.1 Signals
        2. 2.2.5.2 Standard
        3. 2.2.5.3 Schematics
          1. 2.2.5.3.1 High-Side Switch (CS1)
          2. 2.2.5.3.2 Low-Side Switch (CS2)
          3. 2.2.5.3.3 Proximity Detection
          4. 2.2.5.3.4 Vehicle Charge Permission
        4. 2.2.5.4 EV Simulation
      6. 2.2.6 Pluck Lock
        1. 2.2.6.1 Signals
        2. 2.2.6.2 Schematics
        3. 2.2.6.3 Motor Driver
        4. 2.2.6.4 Solenoid Driver
      7. 2.2.7 Temperature Sensing
        1. 2.2.7.1 Signals
        2. 2.2.7.2 Schematics
        3. 2.2.7.3 Calculation
      8. 2.2.8 Connectivity
        1. 2.2.8.1 RS-485
        2. 2.2.8.2 RS-232
        3. 2.2.8.3 CAN
      9. 2.2.9 General Purpose Input/Output
        1. 2.2.9.1 Digital Input
        2. 2.2.9.2 Analog Input
        3. 2.2.9.3 Digital Output
    3. 2.3 Highlighted Products
      1. 2.3.1 MSPM0G3507
      2. 2.3.2 AM62L
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
    2. 3.2 Test Setup
      1. 3.2.1 Power Supply Options
      2. 3.2.2 XDS110 Debug Probe
        1. 3.2.2.1 Application (or Back Channel) UART
        2. 3.2.2.2 Using an External Debug Probe Instead of the Onboard XDS110
      3. 3.2.3 Connecting to the AM62L-EVM
      4. 3.2.4 Connector, Pin Header, and Jumper Settings
    3. 3.3 Test Results
      1. 3.3.1 Control Pilot
        1. 3.3.1.1 TLV1805 Output Rise and Fall Time
        2. 3.3.1.2 Control Pilot Signal Voltage Accuracy in Different States
      2. 3.3.2 GB/T ChaoJi
        1. 3.3.2.1 GB/T Signal Voltage Accuracy
        2. 3.3.2.2 ChaoJi Signal Voltage Accuracy in Different States
      3. 3.3.3 Digital and Analog Input
        1. 3.3.3.1 Digital In
        2. 3.3.3.2 Analog In
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author
  12. 6Revision History

2.2.1.4 Control Pilot Signal Circuit

Figure 2-3 shows the full schematic of the control pilot subsystem.

TIDA-010939 Control Pilot Signal Generator Circuit Figure 2-3 Control Pilot Signal Generator Circuit

The bipolar ±12V control pilot signal is required to travel down several meters of cable and through a load resistance. Therefore, an amplifier must have a minimum of ±12mA sinking and sourcing current with a rise time and fall time < 2μs, per SAE J1772 specifications.

To accommodate these parameters, an amplifier with a wide input range and reasonable power output is selected. The TLV1805 device has a voltage rating of ±18V and a high output sink and source peak current of over 100mA, making the device a good match for the application. In addition, while most EVSEs do not require an automotive qualification, a Q1-rated variant of the TLV1805-Q1 device exists, if this feature is desired. The amplification circuit is a simple rail-to-rail output configuration of the TLV1805 device, with the MCU I/O driving the positive input.

The output of the pilot amplifier is also fed into a simple voltage divider so that the MCU can measure the voltage during operation and detect the load resistance of the vehicle. To take variances such as resistor tolerances, cable resistance, ground shift, chassis resistance, active accessory devices (air conditioning, rear defog, and so forth), or other factors that can shift these values into account, the SAE J1772 standard recommends following boundary voltages as Table 2-4 shows.

Table 2-4 Control Pilot Boundary Voltages
STATE MINIMUM VOLTAGENOMINAL VOLTAGEMAXIMUM VOLTAGE
State B8V9V10V
State C5V6V7V
State D2V3V4V