Other Parts Discussed in Thread: MSP430FR6047
Tool/software:
Everything was working (minus the LCD). Flow measurements were looking good. I swapped out the transducers with transducers of similar capacitance and got an "unknown error". I posted a question and the community helped me get it re flashed and it was working like new again, but today regardless of the transducer configuration it says "No signal detected in up and downstream channel". I tried reflashing and adjusting settings, but no change.
More upsetting is that the ADC capture shows a very negative upstream channel (not the normal noise near zero). This persists regardless of if flow meter transducers are connected or not. I am worried this is permanent board/chip damage.
This has occurred on 2 of 2 eval boards. The second one I made certain there was never a short circuit and it instantly went in the the "unknown error" issue.
- Any idea what "unknown error" could encompass? and why re flashing it makes it go away?
- Any idea what would make that upstream channel go low like that?
- It looks like the output is current limited with a resistor and the input blocks DC with a capacitor. Should there be additional protection on these? Like TVS diodes?
- Even speculation would help, I am stumped. All I can figure is the previous transducers had some sort of TVS or electrostatic protection build in?