Tool/software:
I'd like to consult about a problem with the F280049C chip:
I've designed a control board with the F280049C as the main controller. During power-on testing, when trying to program the code using CCS, I encountered the following error:
The explanation is:
The controller has detected a target power loss.
The user must turn-on or connect the power supply for the target.
The current is also very low(70mA?), suggesting the chip isn’t working correctly. After the error occurred, I checked the following:
- Test the power supply pins of the chip, VDDA, VDD, and VDDIO. The displayed voltages are normal.
- Check the status of the chip reset pin XRsn: it is stably at a 3.3V high level.
- JTAG circuit inspection: It is the same as the circuit provided in the datasheet, and all voltage pins have been tested and are normal.
- Clock signal: Use the internal clock signal. After power-on, by default, it starts oscillating automatically (but it has not been detected with an oscilloscope, so it is not clear whether it oscillates normally).
It's not clear where the problem lies now and how to proceed with the subsequent investigation. Hope everyone can offer some suggestions.
