Hello,
My name is Hye-Woon Jang, and I am currently using the RD33772C14VEVM board.
After purchasing the board, I connected it to a DC power supply as shown in the attached photo. Since I do not currently have a suitable 12 V battery available, I am supplying 12 V using the power supply instead.
The connections are as follows:
- 12 V + : VBAT+, K30_12V_L
- 12 V - : VBAT-, GND_KL31_DOWN
I am contacting you because, even when only the power supply is connected, the red RESET LED turns on and continues blinking at intervals of approximately 0.5 to 1 second, as shown in the attached photo.
Should I understand this behavior as the board being repeatedly reset?
I am asking because the LED brightness appears to be different from when I manually press the RESET button.
I would like to run a model using TRACE32. However, when the board is connected to TRACE32, the RESET indication in TRACE32 blinks at the same time as the RESET LED on the board, and it seems that TRACE32 is therefore unable to establish a connection with the target.
I would appreciate it if you could confirm whether this RESET LED behavior is normal and advise me on how to resolve the issue. Thank you for your assistance.
Best regards,
Hye-Woon Jang
#rd33772c14vevm #s32k344 #JTAG #MBDT #reset #T32 #TRACE32
My understanding is that this board functions as an emulator for battery cell voltages and temperatures when 12 V is supplied as follows:
*12v + to K30_12V_L
*12v - to GND_K31_DOWN
Could this emulator board be used in place of connecting at least three actual battery cells to the MC33772C?
Hello Jang,
please refer to the section 13.2.2 in the MC33772C datasheet. Minimally 3 Cells must be populated with the MC33772C.
For the RD33772C14VEVM 4 Cells are recommended. Then the Cells must supply the MC33772C. Power supplying the MC33772C from external source without populating the Cells will not work.
Please also refer to the AN12536 attached.
With Best Regards,
Jozef
12 V SUPPLY (−)
→ B−
→ SHUNT
→ VBAT−
→ X-14VBMS-EMU GND_KL31_DOWN
Hello Jang,
thank you for pointing me to the X-14VBMS-EMU, I see it now. I see a possible issue in the connection. Please connect the negative side of the X-14VBMS-EMU to the other pin of the shunt resistor, so the current will flow through the Shunt resistor and sensed by ISENSE pins. Please refer to the RD33772C14VEVM schematic attached.
Please check if you have the J1 connector populated, for setting the FS26 to DEBUG mode.
Please follow the powering order. First please connect the 12V to B+ and B-.
Then connect the connector to J6.
Connect the battery simulation cable to J5 and connect the power source (+12V to the BAT+ (K30) and negative point from the Shunt resistor to BAT- (K31)).
With Best Regards,
Jozef
Hello JozefKozon,
Thank you for your response.
Based on what you explained and the RD33772C14VEVM board schematic, I connected it as follows: 12 V supply -> shunt -> EMU. However, the reset behavior is still the same.
Could you please answer the following questions?
I am supplying power after setting the DC power supply to 12 V and 1.5 A. However, I confirmed that the actual current going into the board is 12 V and 0.04 A. Could this be a problem?
If the issue in question 1 is a problem, what should I do to make 1.5 A flow into the board?
As you explained, I configured the setup so that the wire from the power supply goes through the shunt resistor and then to the EMU. Could you please confirm once whether the setup shown in the attached photo is correct?
When TRACE32 is connected, it appears that a reset occurs once every 0.5 seconds, and because of this behavior, I cannot connect TRACE32 to the board. Is there a way to confirm whether the board is actually performing a reset? When I measured the voltage between JTAG pin 10 and GND, it was 4.9 V. However, since I do not have an oscilloscope, there is a limitation in confirming the reset behavior through the JTAG pin.
If there is a way to stop the reset behavior, could you please explain it in detail, even though it may be inconvenient?
Since we have not yet been able to obtain a 12 V battery, we are conducting the test with the VBAT terminals left unconnected. When 12 V is supplied to B+ and B−, we confirmed that 12 V is present at the VBAT terminals. Could leaving VBAT unconnected be causing the issue?
I look forward to your response.
Thank you.
Hello Jang,
Would it be correct to understand it this way?
12 V SUPPLY (−)
→ B−
→ SHUNT
→ VBAT−
→ X-14VBMS-EMU GND_KL31_DOWN
[A] Yes, this is how it is depicted in the RD33772C14VEVM board schematic.
With Best Regards,
Jozef