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Original question:

TCAN1044AEV-Q1: Interrupt Signal TCAN->STM when in Standbymode

TCAN1145EVM: Issue during set up evaluation board in normal mode.

Phuoc Ly
Prodigy 10 points
Part Number: TCAN1145EVM
Other Parts Discussed in Thread: TCAN1145-Q1

Tool/software:

Hi TI team,

Recently my team and I started working on the TCAN1145-Q1 for our new project so we purchased a TCAN1145EVM board to evaluate first.

Set up:

  1. Using TI web GUI to control the EVM (Is there a preference between offline and this web tool?)
  2. Power the board from 5V USB port.
  3. VBAT/VSUP is powered from 5V J2 header.
  4. VCC is powered from 5V J2 header.
  5. VIO is powered from 3.3V when short J2 pin 3 and 4.
  6. S7 dip switch pin 1 to 4 set ON to connect TI controller SPI to the transceiver, pin 5 and 6 left OFF to connect external CAN controller.
  7. J1 Pin 3 and 5 are connected to an external CAN controller RXD and TXD respectively 
  8. J5 is shorted to provide 120Ohm termination.
  9. J4 DSUB9 is connected to a PCAN to USB device.

Procedure and issues:

Power on 5V USB and GUI shows that a TCAN1145-Q1 device is connected.

Press clear interrupt and start device

This step sometimes the device goes immediately to sleep mode and cannot be woken to standby or quickly switch to standby/normal then sleep immediately. Do you know what could be the cause here?

When in normal mode and not connected to any other CAN device via DSUB9, Voltage measure on CANH can CANL to GND are 0V, which is not 2.5V as expected?

When TXD wave signals is applied to the transceiver, there is no reaction on the bus and also RXD pin.

All SPI commands are still able to be read or written to the transceiver but after sometimes actively working on the GUI SPI will be in inactive state (even auto read every 1 second is turned on).

Could you please check the setup to see if it is sufficient or not? And also is the behavior of the chip expected or not?

Best regards,

Phuoc

  • 0
    TI__Guru 53575 points

    Hi Phuoc,

    Thanks for sharing your question on E2E. 

    Phuoc Ly said:
    Is there a preference between offline and this web tool?

    Both version of this tool will work the same. The web tool allows easy access to the GUI from any computer without having to download any software. 

    Phuoc Ly said:
    This step sometimes the device goes immediately to sleep mode and cannot be woken to standby or quickly switch to standby/normal then sleep immediately. Do you know what could be the cause here?

    This device has a sleep wake error (SWE) timer that is used to place the transceiver into sleep mode if a long period of inactivity (~4 minutes) is detected. Please ensure you are switching the device into normal mode within 4 minutes of initial power on of Vsup. 

    Phuoc Ly said:
    When in normal mode and not connected to any other CAN device via DSUB9, Voltage measure on CANH can CANL to GND are 0V, which is not 2.5V as expected?

    This EVM does not have a CAN controller included on it, so another device will need to be connected to the TXD and RXD pins of the transceiver in order connect to other CAN nodes and drive CAN data. When in normal mode, the CAN bus should be biased to 2.5V. This bias may be turned off in other modes if the CAN bus is idle. Please ensure the transceiver is in the correct mode. Keep in mind the SWE timer. I recommend periodically clearing the device interrupts in order to prevent an automatic timeout into sleep mode. 

    Let me know if you have any more questions. 

    Regards, 
    Eric Schott