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TPS3431-Q1: CWD time out cpapcitor question

Tommy Tzeng
Genius 5790 points
Part Number: TPS3431-Q1

Tool/software:

Hi Sir,

would like to clarify if the CCWD can use 10uF or 22uF to set the longer CWD time or not? because the C_CWD capacitor is test between 100pF and 1uF in the datasheet.

may we use 10uF and 22uF for longer time design?

  • 0
    TI__Genius 9870 points

    Hi Tommy, 

    We cannot guarantee device behavior if specifications as reported in the datasheet are not met.

    Please provide your design requirements so that I can check if another watchdog in our portfolio can suit with better. 

    TPS3435-Q1 has more fix timing option. Please check this device as well. 

    Best,

    Sila Atalar 

  • 0 in reply to Sila Atalar
    Prodigy 60 points

    Hi Sir,

    I would like to check that does the tolerance of tWD depends on capacitor's tolerance, bias voltage? Or just TPS3431-Q1 internal tolerance?

    How to check the tolerance of tWD on capacitor's tolerance, bias voltage?

    Thanks,

    Ocean

  • 0 in reply to YULUNG HSU
    TI__Genius 9870 points

    Hi Yulung, 

    The total device tolerance can be found in section 6.8 Typical Characteristics. Please check the figure 6.6 Normalized Watchdog Timeout (tWD) Accuracy (SET1 = 1, CWD = NC)  and 6.7 Normalized Watchdog Timeout (tWD) Accuracy (SET1 = 1, CWD = 10kΩ)

    And all the external capacitor and resistor tolerance is additional.

    Best,

    Sila Atalar