Voltage and Current Measurements with the USB PD Analyzer – Total Phase
Voltage and Current Measurements with the USB PD Analyzer

With the latest version of the USB Power Delivery Analyzer you can measure the voltage and current on several of the signal lines in the USB Type C connector and record the changes in the Total Phase Data Center tool. The question is often asked, "What are the signals and what do they represent?"

What are the various voltage and current measurements from the USB PD Analyzer?

  1. Vbus Voltage - Measured via an INA231 ADC on the Vbus lines of the USB Type C receptacle connector pins A4, A9, B4, and B9
  2. Vbus Current - Measured via an INA231 ADC across a 0.015 Ohm shunt resistor between the Vbus input Type C receptacle and the Vbus Type C plug
  3. Vconn Voltage - Measured via INA231 ADC on CC2 signal (pin B5) of the USB Type C receptacle - Please note you may need to flip the PDA over if Vconn ends up on the CC1 signal pin (A5)!
  4. Vconn Current - Measured via an INA231 ADC across a 0.015 Ohm shunt resistor between the CC2 (pin B5) Type C receptacle and the CC2 (pin B5) Type C plug
  5. CC1 Voltage - Measured via STM32's internal ADC - this clips at 3.3V and is useful as "traffic indication".
  6. CC2 Voltage - Measured via STM32's internal ADC - this clips at 3.3V and is useful as "traffic indication".
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