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rava_4805041
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Schematic Verification For Cap Sense Touch Switch using  CY8C4124AZI-S433 MCU

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ncbs
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Hi @rava_4805041,

> P0.4 and P0.5 - if they are used for I2C, have a series resistor of 330ohm along with the pull-up resistor of 4.7kohm. If they are used for SPI, then the schematic is fine.

> pin 39 and pin 40: only 1 pair of decoupling capacitors [1uF and 0.1uF] is enough. Remove the extra capacitors present.

> Button 9_ Led2 on pin 17: what does this pin signify?

Regards,

Nikhil

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ncbs
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500 replies posted 50 likes received 250 sign-ins

Hi @rava_4805041,

> P0.4 and P0.5 - if they are used for I2C, have a series resistor of 330ohm along with the pull-up resistor of 4.7kohm. If they are used for SPI, then the schematic is fine.

> pin 39 and pin 40: only 1 pair of decoupling capacitors [1uF and 0.1uF] is enough. Remove the extra capacitors present.

> Button 9_ Led2 on pin 17: what does this pin signify?

Regards,

Nikhil

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ncbs
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Hi @rava_4805041,

To be more specific on the de-coupling capacitors point, use [1uF+0.1uF] pair on pin 39 and another  [1uF+0.1uF] pair on pin 40.

Regards,
Nikhil

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rava_4805041
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 Hi,

    Please find the updated schematic and BOM as per given requirement for Review.

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ncbs
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Hi @rava_4805041,

I see the de-coupling capacitor point beng addressed to - Yes, the new schematic have them correctly connected.

Regards,
Nikhil

Thanks for quick update.

Regards,

Rahul

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