SN65C3232: Affect of each capacitors for characteristics

Kuramochi Tadahiko

Part Number: SN65C3232

Hi,

My customer is trying to set each capacitor as below and concern about degrade characteristics as compared to specified characteristics.

C1=0.1μF、C2,=C3=C4＝0.47μF

Do these capacitances effect to specified characteristics?

If yes, which characteristics are affected?

Best Regards,

Kuramochi

over 5 years ago

0 Miguel Robertson over 5 years ago

TI__Guru 62920 points

Hello Kuramochi-san,

These capacitors are used by the device's charge pump circuit, which generates the V+ and V- rails which are then switched onto the DOUT terminals in order to send data. The capacitor values will primarily affect the amount of ripple present on these voltages. For a detailed description of the charge pump operation and the effect of each capacitor, I would recommend referencing this blog:

https://e2e.ti.com/blogs_/b/analogwire/archive/2018/06/28/how-the-rs-232-transceiver-s-regulated-charge-pump-circuitry-works

If you have any further questions, please let us know.

Regards,
Max

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SN65C3232: Affect of each capacitors for characteristics