MCF8329A: 8329A

Hi Zhang,

Thanks for reaching out. 

Could you confirm if my understanding is correct:

Your configured ILIMIT and actual peak value of the current differs by 5%, and you want this to be less than 2%, correct?

Regards,
Sachin S

Yes, I need less than 2% limit design

Hi ,I have another problem here, at present, I use the open circuit to detect the fault in the 8329AEVM test board can detect the NO_MTR fault normally, the same motor and parameters can not be identified in my own design PCBA NO_MTR fault, what is the relationship between this and the hardware, how do I need to adjust.

Hi Zhang,

zhang jianquan said:

Yes, I need less than 2% limit design

Let me check on this and get back to you.

zhang jianquan said:

I use the open circuit to detect the fault in the 8329AEVM test board can detect the NO_MTR fault normally, the same motor and parameters can not be identified in my own design PCBA NO_MTR fault, what is the relationship between this and the hardware, how do I need to adjust.

There is ideally no relation between PCB and NO_MTR fault, whenever the phase windings are missing the device will show a NO_MTR fault. Could you provide steps on how you are testing this?

Regards,

Sachin S

Our test method is to use the 8329AEVM to connect the motor to our own board separately, remove one of the motor phase cables and connect it to the power on, and the 8329AEVM can be recognized normally.

Thanks Zhang,

Are you giving a SPEED command on both PCBs to test the NO_MTR fault?

Regards,

Sachin S

yes

Hi Zhang, 

Thanks for confirming, also just to reconfirm you are observing NO_MTR faults working on one board but not the other, correct?

And are you using the same configuration as the one you mentioned in the question:

zhang jianquan said:

value	addr
0x006CAC20	0x00000080
0xA8200000	0x00000082
0x048748D0	0x00000084
0x93112294	0x00000086
0x143181B8	0x00000088
0x8BAD1530	0x0000008A

Regards,
Sachin S

yes

Hi Zhang,

I see that the NO_MTR threshold is set to 1%, could you increase that to 5% and let me know if the issue is resolved.

Regards,
Sachin S

Attempts have been made, and 5% to 20% are abnormal and cannot be judged normally

Could you please share the details on behaviour with 5% to 20%? Are you still observing no flag for NO_MTR. Also if possible please do share the PCB design files, will review and see if I can find any discrepancies that may cause this.

Regards,

Sachin S