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Original question:

TCAN1044V-Q1: Schematic review

TCAN1044V-Q1: TCAN1044V-Q1 Do i need to use Transistor for STB pin to meet VIO level? or can i connect the STB pin directly to Processor?

LAKSHMIPRIYA PANDURANGAN
Prodigy 50 points

Part Number: TCAN1044V-Q1

Hi Team,

I am using TCAN1044VDRQ1 in 2 wheeler cluster application. 

Would like to get the schematic reviewed. 

VCC is 5V, VIO is 3.3V.

Do i need to use Transistor for STB pin to meet VIO level? or can i connect the STB pin directly to Processor? 

  • 0
    TI__Guru 53575 points

    Hi Lakshmipriya,

    While the input threshold for the STB pin will be set by the Vio level, the absolute maximum for this pin is still 6V. This means that a 5V input may still be used for STB when Vio is supplied with a lower voltage. For this schematic, the external level shifter is not necessary. 

    The rest of the schematic looks good. I don't have any changes to recommend. See my notes below. 

    • Decoupling capacitors included and valued appropriately.
    • Optional split capacitor included and valued appropriately.
    • Bus capacitors included and valued appropriately - ensure placement close to connector and along signal path.
    • TVS diode included - ensure placement close to connector and along signal path.
    • Optional termination resistors included correctly and valued appropriately.

    Let me know if there are any questions or concerns regarding the design.

    Regards,
    Eric Schott