5 Replies Latest reply on Sep 4, 2018 3:34 AM by toshifumiy_06

Regarding recommended series resistance of Capsense SPI interface.

matsubara-y_1534086 Sep 3, 2018 7:39 PM

Q1)

Could you please let us know recommended series resistance of Capsense SPI interface?

Is it 330ohm?

Q2)

Should series register be added to all SPI interface(miso, mosi, sclk, ss)?

Best Regards.

1. Re: Regarding recommended series resistance of Capsense SPI interface.

toshifumiy_06 Sep 3, 2018 9:12 PM (in response to matsubara-y_1534086)

>Q1)
I'm sorry. I could not understand the meaning of the question.
Is CapSense's question? Or is it an SPI question?

>Q2)
If you have not read this SCB Component datasheet yet, please read this datasheet.
http://japan.cypress.com/documentation/component-datasheets/psoc-4-serial-communication-block-scb
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2. Re: Regarding recommended series resistance of Capsense SPI interface.

matsubara-y_1534086 Sep 3, 2018 9:18 PM (in response to toshifumiy_06)

Below is figure of capsense design guide(AN64846).

Cypress recommends 330 ohm for I2C series resistance value.

I would like to confirm recommended series resistance value when communication is SPI.

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3. Re: Regarding recommended series resistance of Capsense SPI interface.

toshifumiy_06 Sep 4, 2018 3:23 AM (in response to matsubara-y_1534086)

Yes, it is recommended to connect 330 ohm resistor even for SPI.
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4. Re: Regarding recommended series resistance of Capsense SPI interface.

matsubara-y_1534086 Sep 4, 2018 3:26 AM (in response to toshifumiy_06)

Should series register be added to all SPI interface(miso, mosi, sclk, ss)?
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5. Re: Regarding recommended series resistance of Capsense SPI interface.

toshifumiy_06 Sep 4, 2018 3:34 AM (in response to matsubara-y_1534086)

Yes, you are right.
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