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Original question:

THVD1520: THVD1520 typ schematic TVS suggestion solution

TPD1E10B09: Question ESD suppressor for STM32F401VE(that spec sheet is attached)

Inho Jeon
Expert 1452 points
Part Number: TPD1E10B09
Other Parts Discussed in Thread: TPD1E1B04

Dear TI,

I designed ESD suppressor using TPD1E10B09 for '3.3V levels' I/O port of "STM32F401VE(I attach specsheet below this)" like below circuit.
"CHIME_SW_F" is connected GPIO port of "STM32F401VE". That function is push-button that input signal (low[0v] or high[3.3V]) for port of "STM32F401VE".

I have a quesition.

TPD1E10B09 is "9V" working voltage.
So, I wondering that part is proper ESD suppressor for "3.3V" I/O port of "STM32F401VE".

TPD1E1B04DPY is "3.6V" working voltage. is that part better than TPD1E10B09 ?
Please, reply my question. If that part is not proper ESD sup., recommend right ESD sup. 

Thank you.
Best Regards,
Inho Jeon

   

stm32f401ve.pdf

  • 0
    TI__Expert 8471 points

    Hello Inho,

    TPD1E1B04 would be a much better fit for this application. You want you your Vrwm to be as close to the normal operating voltage of the line as possible without it going under. In this case, the max voltage the line should see is 3.6 V. TPD1E1B04 also has a much lower capacitance than TPD1E10B09, so you will have better signal integrity. 

    Regards,

    Matt Smith

  • 0 in reply to Matt Smith3
    Expert 1452 points

    Dear Matt,

    Thanks for the reply.
    I attach the schematic below this.
    This is a tact key that works with voltage levels.
    For example, if you press 'S22', '0.837V' is transmitted to the ADC port of 'STM32F401VE'.
    Each tact key "TPD1E1B04DPY" has been applied to suppress ESD.
    Please review my circuit and comment.

    Thank you.
    Best Regards,
    Inho Jeon

  • 0 in reply to Inho Jeon
    TI__Expert 8471 points

    Hello Inho,

    This looks correct. Each device is connected in parallel to the line they are protecting and next to each possible ESD source (i.e. the push buttons). This will dissipate any possible ESD energy and protect these resistors from being damaged and possibly causing the ADC to interpret the incorrect key being pressed.  

    Regards,

    Matt Smith