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TCAN1043G-Q1: nFAULT pin question

user4979989
Intellectual 2800 points
Part Number: TCAN1043G-Q1
Other Parts Discussed in Thread: TCAN1043

Hi sir,

My customer is connecting TCAN1043G-Q1 nFAULT pin to MCU, may I know how should customer use this pin in their application?

We are also planning to test the functionality of this pin, do you have suggestion how to test this pin function?

Based on the datasheet, during standby mode, nFAULT is low. When CAN bus wake up, nFAULT is high, is it correct?

How about normal mode? will nFAULT be high or low?

Thank you.

  • 0
    TI__Mastermind 48215 points

    Hi,

    The nFAULT pin can indicate many things, so the use will depend on what features are desired to use in the system. For instance, the nFAULT pin will be asserted in Standby mode after initial power-up or when waking from Sleep mode. In this state, the pin indicates the status of the PWRON OR WAKERQ flags. When the device moves to Normal mode, these flags will be cleared and the nFAULT pin will go high. This is likely the simplest scenario to test pin functionality. 

    While in Normal mode, the nFAULT pin is used to indicate the CBF flag which will assert when the transceiver detects a bus fault when driving CAN data. If bus fault detection is a desired feature, this may also be tested. However, testing the previous case above will likely be a simpler test for basic pin functionality. 

    Also, I would recommend promoting TCAN1043A for new designs. This device is produced with an updated manufacturing process and will have better potential long term supply capabilities. 

    Let me know if you have any more questions.

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Intellectual 2800 points

    Hi Eric,

    When entering sleep mode, VBAT pin has no power, CANH and CANL receive WAKE UP Pulse, will INH send high active signal out?

    Thank you.

  • 0 in reply to user4979989
    TI__Mastermind 48215 points

    Hi, 

    When the Vsup pin (battery) is not supplied to TCAN1043, the device is powered off completely (regardless of Vcc and Vio states). In this state, the device is not able to monitor the CAN bus. If Vsup is supplied and the transceiver is in Sleep mode, a wake up pulse (WUP) on the CAN bus will cause INH to go high (transceiver enters Standby mode). 

    Regards,
    Eric Schott