TCAN4550-Q1: There is no INT output signal in TCAN4550-Q1

Amelie Zheng

Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550

Hi Team,

My customer now use TCAN4550-Q1.

At first, customer found that when receiving large traffic data, there will be frame loss "msg lost in rxf0"

Then customer changed the interrupt thread to receive only one frame at a time to a maximum of 32 frames, and the frame loss problem was solved.

But there is a new problem. When the CAN baud rate is 1M, after running for a period of time, there is no TCAN interrupt signal (INT PIN has no output for SOC) anymore. It seems that TCAN4550 doesn't work at that time.

Could you please kindly help for this?

over 5 years ago

0 Eric Hackett over 5 years ago

TI__Guru 74282 points

Amelie,

Thanks for the patience on this thread. I'm glad the customer solved their first issue, but no good about the second issue.

When the interrupt stops working, what is the status of the INH and VCCOUT pins? And are CAN and SPI communication happening when the interrupt stops working?

Regards,

0 Amelie Zheng over 5 years ago in reply to Eric Hackett

TI__Genius 10865 points

Hi Eric,

Customer now doesn't use INH and VCCOUT. So they don't test.
In shortCAN frames cannot be sent out...

0 Eric Hackett over 5 years ago in reply to Amelie Zheng

TI__Guru 74282 points

Amelie,

My suspicion is that the device is transitioning into sleep mode, and this would be indicate by the INH or VCCOUT pins being low, so being able to probe those signals would be helpful. Another way we can check is if SPI is working correctly when interrupts stop working and CAN bus stops sending CAN communication. Is SPI working when this happens?

Regards,

0 Amelie Zheng over 5 years ago in reply to Eric Hackett

TI__Genius 10865 points

Hi Eric,

If the spi can't work and it won't affect the reception, the interrupt signal should be there...

So SPI may not be a problem...

0 Eric Hackett over 5 years ago in reply to Amelie Zheng

TI__Guru 74282 points

Amelie,

If the SPI is not working then it is very likely the device is in sleep mode, which means nothing else besides wake-up functions will work either. Is the SPI working when this issue occurs? We need to find out what mode the device is in, and if the customer cannot access INH or VCCOUT, checking SPI is another option.

Regards,

0 Amelie Zheng over 5 years ago in reply to Eric Hackett

TI__Genius 10865 points

HI Eric,

As customer feedback,SPI should be working. Because customer gave an interrupt signal from the outside, spi is reading normally.

0 Eric Hackett over 4 years ago in reply to Amelie Zheng

TI__Guru 74282 points

Amelie,

Sorry for the delay in this, what's the status of this issue with the customer? Were they able to resolve not seeing the interrupt from the TCAN4550-Q1?

Regards,

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TCAN4550-Q1: There is no INT output signal in TCAN4550-Q1