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TCAN1042V-Q1: configuration problem of TCAN1042

user021864
Intellectual 2145 points
Part Number: TCAN1042V-Q1
Other Parts Discussed in Thread: TCAN1042-Q1

Hi, 

My customer is using TCAN1042V-Q1, they are having below configuration questions: 

1. general output port of the CAN interface have to used common mode choke, is TCAN1042 using choke-less structure? 

2. will it become a EMI source if there are no choke at the output port of the CAN bus? is there an EMI filter reference circuit can used for reserve? 

3. Can TCAN1042V-Q1 are able to meet transmission rate up to 2Mbits/sec? 

4. if using 5V for supply voltage, can VIO pin been left floating or it needs to be connect to 5V? 

Thanks for your help. 

  • 0
    TI__Guru 74292 points

    Hello user,

    Thanks for coming to E2E for these questions.

    1. In general, CAN bus lines do not need a common-mode choke to function. A common-mode choke is used to help with RF emissions, but also can help with RF immunity. The TCAN1042V-Q1 was able to past emissions and immunity certifications without a common-mode choke, and this is why the datasheet states chokeless operation. However, in most applications a common-mode choke is still used if the customer can afford the price and/or board space, just to be sure.
    2. The device will emit more noise than with a common-choke installed on the bus, but it should not present any issues for other devices in close proximity. This is part of the automotive EMC certification required for automotive transceivers, and the TCAN1042V-Q1 passed these certifications without a common-mode choke installed.
    3. Yes it can, and the TCAN1052GV-Q1 can work up to 5Mbps.
    4. The VIO pin must be connected to a voltage source in order for the device to function properly, otherwise an undervoltage flag will be raised and the device will go into protected mode until the VIO voltage returns. If it is desired to leave pin 5 floating, the TCAN1042-Q1 device can be used. It has all the same functions and certifications as the TCAN1042V-Q1, except the entire device is powered off of VCC. No VIO is present.

    Please let me know if you have any other questions or concerns.

    Regards,