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TCAN1044-Q1: TCAN1044 Functional Safety disscussion

Part Number: TCAN1044-Q1
Other Parts Discussed in Thread: ESD2CAN24-Q1

Hi Team

TCAN1044 Functional Safety FIT Rate, FMD, and Pin FMA documentabout Table 3-1. Die Failure Modes and Distribution

this mean that TCAN1044 may have various Fail ratios? There may be 45% Failure when RX / TX transmission?

Or what it means? THX

  • Kygo,

    This does not mean that on every transmission there is a 45% chance that the transmitter fails. This means that, in a very rare scenario, if there was a die failure it has the highest chance of occurring in the receiver or transmitter section of the die. The two things that are taken into account to come up with this percentage is what percent of the total die does this section make up and how complex is this section of the die.

    Let me know if that makes sense.

    Best,

    Chris

  • Hi Chris

    More question need your confirm ,THX

    Below picture is customer TCAN1044 SCH,

    1.The VIO connect to 3.3V ,will the VIO voltage affect CANH CANL voltage? (If customer haven't connect any voltage to VIO, then the CANH CANL voltage reference from Vcc , right? )

    2.Witch is the reference value of the system CAN Bus voltage?

  • Kygo,

    1. The VIO is for the digital logic pins (TXD,RXD,STB). The CAN bus is always referenced to VCC whether you are using VIO or not. However, keep in mind that if a device has a VIO pin the VIO must be connected to a voltage rail. You cannot leave VIO un-powered or your device will be in an undevoltage state and will not function.

    2. Since your VCC is 5V the CAN bus will be referenced to 5V.

    I looked at the schematic and it looks good overall. The filter caps C86,C89 are a little high for a CAN bus. They are fine if you don't have too many nodes (<3) but if you have a lot of nodes you could be overloading the device. Also for the TVS diodes I recommend you look at the ESD2CAN24-Q1. This is a new ESD diode that TI is developing and is a good socket to win on all CAN buses.

    Best,

    Chris