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DS125DF111 / VDD de-coupling capacitance

Toshiyuki
Mastermind 7075 points

Hi,

We have a question about VDD de-coupling capacitance.

The data sheet says that VDD de-coupling total capacitance should be <0.5uF in 3.3V mode operation.

In addition, A 0.22 uF cap is recommended at each of the two VDD pins.

Could we set 0.1uF cap at each of two VDD pins?

Best Regards,

Kato

 

  • 0
    TI__Expert 3175 points

    Hi Kato San,

    At 3.3V mode, 3.3V is applied to VIN pin, VDD pins become the on-chip regulator output at 2.5V, and need external VDD bypass. We recommend 0.22uF at each VDD pin, with total bypass at VDD pin <0.5uF.

    Is there any reason why you want to use 0.1uF instead?

    regards,

    TK Chin

  • 0 in reply to T.K. Chin
    Mastermind 7075 points

    TK Chin - san,

    Thank you for the reply.

    I would recommend our customer to select 0.22uF at each VDD pin as written the data sheet.

    Our customer just want to use registered parts 0.1uF.

    Best Regards,

    Kato