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switching frequency in a switched capacitor block (PSoC1) | Cypress Semiconductor

switching frequency in a switched capacitor block (PSoC1)

Summary: 2 Replies, Latest post by rjvb on 28 Dec 2012 03:45 AM PST
Verified Answers: 1
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user_161749391's picture
73 posts

 hi developers,

                             i am exploring the generic switched capacitor block in PSoC1. the switched capacitor block parameter list does not include a frequency selection option. is it user configurable? if so where can i find the frequency of switching. because for my design i need the input resistance value which is calculated as 1/(capacitance*switching frequency).

user_1377889's picture
9274 posts

The block (column) in a PSoC1 has an input for a frequency you have to select.You may use VC1 to 3, sysclk or any self-generated frequency (with a timer/counter/PWM) or even an externally supplied frequency. When you drop a SCBLOC on your chip-area you find the clock-selection on the right of the column consisting of two parts: a 4-1 mux and two 1-16 muxes giving you approximately  35 different clock sources.


Happy clocking


rjvb's picture
Cypress Employee
90 posts

Note that the maximum analog column clock frequency specification is 8MHz. That means, the maximum allowed switching frequency in SC blocks is 2MHz (8MHz/4). 

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