TCAN1044-Q1: TCAN1044DRQ1

bhagwant khardekar

Prodigy 40 points

Part Number: TCAN1044-Q1

Tool/software:

When TCAN IC standby pin goes High ( Standby mode ) within some Time RX is getting low
how to resolve this issue

1 month ago

0 Michael Ikwuyum 1 month ago

TI__Guru 51106 points

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.

0 bhagwant khardekar 1 month ago in reply to Michael Ikwuyum

Prodigy 40 points

Captured the Waveform during sleep condition as below

Can you please provide feedback on this

0 bhagwant khardekar 1 month ago in reply to bhagwant khardekar

Prodigy 40 points

0 Michael Ikwuyum 1 month ago in reply to bhagwant khardekar

TI__Guru 51106 points

Hi Bhagwant,

Please help give some time for feedback and I should be able to update by tomorrow, thanks.

Best Regards,

Michael.

0 Michael Ikwuyum 1 month ago in reply to Michael Ikwuyum

TI__Guru 51106 points

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.

0 bhagwant khardekar 1 month ago in reply to Michael Ikwuyum

Prodigy 40 points

VIO is connected (pin 5 ) to 3.3V

0 bhagwant khardekar 1 month ago in reply to bhagwant khardekar

Prodigy 40 points

3.3V is permanent on power supply

0 Michael Ikwuyum 1 month ago in reply to bhagwant khardekar

TI__Guru 51106 points

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.

0 bhagwant khardekar 1 month ago in reply to Michael Ikwuyum

Prodigy 40 points

VIO Pin is present in IC Connected to 3.3V permanent supply

0 Eric Hackett 1 month ago in reply to bhagwant khardekar

TI__Guru 74262 points

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

0 bhagwant khardekar 1 month ago in reply to Eric Hackett

Prodigy 40 points

TCAN1044DRQ1

0 Eric Hackett 1 month ago in reply to bhagwant khardekar

TI__Guru 74262 points

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

0 bhagwant khardekar 1 month ago in reply to Eric Hackett

Prodigy 40 points

Hi Eric

In this case i need to maintain VCC (5V Logic ) always High (even in sleep condition ) to resolve this issue ?

+1 Michael Ikwuyum 1 month ago in reply to bhagwant khardekar

TI__Guru 51106 points

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.

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TCAN1044-Q1: TCAN1044DRQ1