• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 34 subscribers
  • Views 154 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1043A-Q1: Is there a way to check in which mode the device is?

Robin Gehring
Prodigy 10 points
Part Number: TCAN1043A-Q1

Hello TI Team

I have some problems sending and receiving CAN Messages with the TCAN1043A-Q1. I want to operate the device in normal mode.

I measured the signals on each pin:

1, TXD : Incoming data byte from the MCU. Range between 5V and 1V

2, GND: 0V

3, VCC: 5V

4, RXD: 5V

5, Vio : 5V

6, EN: 5V

7, INH: 6V

8, nFAULT: 2.2V

9, WAKE: 0V

10, Vsup: 20V

11, NC: 0V

12, CANL: 1.6V

13, CANH: 1.55V

14, nSTB: 5V

I can see the data on the TXD Pin but the CANL and CANH is always on the same level.

If i do it the other way around i can see the data on the pin CANH, CANL but there is no data on RXD.

Do is miss something here? For me it looks like the device is not in normal mode. Is there a way to check in which mode the device is?

Thanks in advance

regards,

Robin

  • 0
    TI__Guru 74292 points

    Robin,

    Typically, the state of RXD and INH are external indicators of the device mode, and EN and nSTB are what control the device mode. The voltages on some of your pins are peculiar though: INH should be within 1V of VSUP, or at GND, and it's at 6V which makes me think there's some kind of voltage divider happening on your board. Also, CANH and CANL should either be at 2.5V or GND, and again, these are at a midpoint. nFAULT should be at 5V or GND, and yet again, another midpoint voltage.

    Is it possible to share a schematic and/or waveforms of TXD, CANH, CANL, and RXD when driving data into TXD? Also, is it possible some kind of damage occurred to the transceiver?

    Regards,

    Eric Hackett