A USB2ANY interface adapter and USB2ANY-Explorer GUI were used to measure the input voltage and current through I2C from the INA237A. The optocoupler circuit was used for the isolated interface. The BIT rate is limited to 10kHz when using the optocouplers. For higher BIT rates, the ISO1640, TCA9517A can be used for isolation of the I2C signals.

Simplified instructions for making the telemetry measurements are shown in the following list. Consult the documentation for the USB2ANY hardware and GUI for more information.

1. Open USB2ANY-Explorer
2. Click Select Interfaces, check I2C and close
3. Select the I2C tab
4. The INA237A Slave Address is 0x45 (both A0 and A1 pulled high by shorting J11 and J12, pins 3 and 4, on the PMP22366 board)
5. BIT rate is 10kHz
6. Bus Timeout is 10ms
7. Entering Internal Address (HEX) of 04 and clicking Read provides the input current in HEX
8. Entering Internal Address (HEX) of 05 and clicking Read provides the input voltage in HEX
9. The INA237A decimal values in Table 3-1 are converted from the HEX measurements provided by the INA237A. Microsoft® Excel® has a HEX-to-decimal conversion function
10. The actual input voltage was measured with a DMM across C57
11. The actual input current was measured as the voltage across R71 divided by 0.1Ω