TMS320F28379D: TMS320F28379D gets disconnected from CCS during system run.

Hello,

Can you perform a JTAG integrity test? It is available in CCS > Target Configuration > Test Connection.

This issue seems to be due to radiating noise or EMI. XDS100 emulators are very prone to such board noises, try to keep the emulator away from your power board.

From the Emulation and Trace Headers Emulation Technical Reference Manual:

"Note: All routing distances from the device pins to the emulation header must be less than 3 inches"

Also, please refer to the Target Connection Design section in the XDS Target Connection Guide.

Best,

Matt

The emulator is around a foot away from the power board. The integrity test is also OK. Whenever I run the code, after reaching around 50W of power, this problem occurs. I reset and again run. The code runs properly. I dont plug in the USB cable again. Again, after reaching around 50 watts, the JTAG problem occurs. However, if there is some voltage (above 15 Volts) in the input capacitor C3, also shown in the earlier schematic, then I have to replug my USB cable and wait for the capacitor to discharge.

What type of isolation are you providing between your PC (running CCS) and high-voltage system?

Are you able to monitor your JTAG signals with an oscilloscope while the board is active? I'm curious how much noise is on your TMS, TCK, TDI, and TDO signals.

Best,

Matt

The isolation between the PC and HV system is provided by the gate driver TI UCC 21530. It is  a 5.7 kVrms, 4A/6A dual-channel isolated gate driver. Below is the schematic of the gate driver.
www.ti.com/.../UCC21530

What are the PINs for TMS, TCK, TDI, and TDO signals? I am not able to locate them on the pinout diagram.

Are you referring to the Chapter 5.1 Pin Diagrams in the data sheet? 

And are you using a LaunchPad? You can also tap into the JTAG pins on the board at U5, see the schematic in C2000Ware at:

C2000Ware_5_04_00_00\boards\LaunchPads\LAUNCHXL-F28379D\R2.0\launchxl-f28379d_r2.0_sch.pdf

Best,

Matt

Yes, I am using a LaunchPad.

Matt Kukucka said:

C2000Ware_5_04_00_00\boards\LaunchPads\LAUNCHXL-F28379D\R2.0\launchxl-f28379d_r2.0_sch.pd

Please refer to this schematic to find the JTAG signals and monitor them with an oscilloscope while the board is active.

Best,

Matt

Him

I'm happy to hear you were able to determine the issue and I appreciate you updating the thread with the resolution!

Best,

Matt