Tool/software:
When TCAN IC standby pin goes High ( Standby mode ) within some Time RX is getting low
how to resolve this issue
Tool/software:
When TCAN IC standby pin goes High ( Standby mode ) within some Time RX is getting low
how to resolve this issue
Hi Bhagwant,
It would seem there is most likely some traffic or noise on the CAN bus for RXD to go low for a Wake signal similar to figure 8-5 of the data sheet and would recommend to verify the bus is recessive and properly terminated, wake filters or noise, and VIO is as expected. Hence, scope CANH, CANL, STB and RXD to confirm frames observed before RXD drops while ensuring VIO is as expected, thanks.
Best Regards,
Michael.
Captured the Waveform during sleep condition as below
Can you please provide feedback on this
Hi Bhagwant,
Please help give some time for feedback and I should be able to update by tomorrow, thanks.
Best Regards,
Michael.
Hi Bhagwant,
Apologies for the delay.
It would seem you are actually not using the VIO option. Hence, RXD going low when P_5V going low is as expected, thanks.
Best Regards,
Michael.
Hi Bhagwant,
TCAN1044-Q1 do not have VIO. It is a no connect pin.
Hence, the device only recognizes VCC. And with the VCC power supply not supplied, the other pins will also not be functional.
Could you please help double confirm? Thanks.
Best Regards,
Michael.
Bhagwant,
Please clarify if you are using the TCAN1044-Q1 or the TCAN1044V-Q1 device. TCAN1044V-Q1 is the device with VIO, TCAN1044-Q1 has no connection at pin 5.
Regards,
Eric Hackett
Bhagwant,
As Michael has said, there is no VIO pin on the TCAN1044DRQ1, pin 5 is a no connect pin meaning it has no function. The TCAN1044DRQ1 can only work with 5V logic. So, if your VCC voltage is not present, the device is unpowered, and no functions will work properly.
Regards,
Eric Hackett
Hi Eric
In this case i need to maintain VCC (5V Logic ) always High (even in sleep condition ) to resolve this issue ?
Hi Bhagwant,
Yes, this is the case. Or you may use the TCAN1044V-Q1 (or the newer version TCAN1044AV-Q1) instead, thanks.
Best Regards,
Michael.