TIDM-ULTRASONIC-FLOW-TDC: Interfacing with MSP-FET and Computer

Part Number: TIDM-ULTRASONIC-WATER-FLOW-MEASUREMENT

Hello,

I am trying to interface the TIDM-ULTRASONIC_FLOW_TDC to my laptop using the MSPFET and the TDC1000-TDC7200 GUI. However when I plug the MSPFET into the board after connecting the appropriate jumpers I get the error "MSP430: Error initializing emulator: The voltage 1524 value is not correct/allowed for the USB FET". How do I go about fixing this and interfacing the board with the PC? I also have an EZ-FET if that is more applicable than the MSP-FET.

I have attempted to use a multimeter to make sure everything is connected, however due to every store being out of stock, I was unable to obtain the Buck converter for U3. This means that I connect 3.3V from the MSPFET directly to the output pin from the converter.

Hello Matt,

Are you seeing the 3.3V at Vcc on the MSP430 device?  Do you have JP6 connected?  

You could also use the eZ-FET connected to the J1 header.  You will need to connect TST, RST, Vcc, GND.

Hi Eddie,

Thank you for the response. I am seeing 3.3V at Vcc for the device. However, As I do not have the buck converter, I am attempting to just wire the 3.3V output of the converter to the 3.3V input. When I do this, the Vcc pin drops to 1.7V. I have attempted to disable everything in the software that would use the converter select pins so that it just uses the 3.3V from the MSP FET, but I have not been successful.

I have also tried using the eZ-FET with the exact same issues. I have JP1, JP6 and pin and 2 of J5 connected. I looked at the schematic and saw that theoutput of the converter, which we would expect to be 3.3V, is connected to e bottom pin of JP5, so I also have that connected to the 3,3V Vcc. However, when i connecte that pin Vcc drops to 1.7V.

Ok.  Something is causing your voltage to get pulled low.  Can you provide diagram of how you have it wired.  Maybe that will help spike something out.

I am sourcing power from the MSP-FET plugged into my USB port on my computer. I have connected jumper 1, jumper 6, pins 1&2 of J4 and then to try and bypass the buck converter, I have connected the bottom pin of JP5 to the jumper on J4. I looked at the altium PCB files and saw that the output pin 5 from the buck converter is connected to the same net as the bottom pin of JP5 so I thought I would be able to provide power to that net this way. When reading the data sheet for the converter though I noticed that it says some pins need to be terminated and the voltage select pin needs to be set. Could that be an issue with this method? I have tried to adjust the source code with no luck. 

Thank you!