I have a question with a system(please check the file that i attached)

In the system i want to make 1Mhz frequency with 6.6V Amplitude.

and want to use 3.3V to operate PSoC3.

Is this possible?

 as i know, the Gate Voltage of FET could give a effect to Vds.

and when i use 3.3V to MPU, it mean the gate voltage of Inside FET is 3.3V.

so, i worried with the system that i attached.

I don't know anything about Characteristics of Inside FET.

if you know, plese let me know.

Thank you.

Hi ysl,

Have you tried using an external FET acting as a switch?

PSoC (while operating at 3.3V) can be used to generate a 1MHzsquare wave which will drive the gate.

The output will be inverted square wave spanning from 6.6V to ~0V.

Yeah,what ^ said is a better idea.

Use a BJT or FET as a switch,and let it fire out your waveform of reqd amplitude,when driven by the PSoC.

Or,add some small Non-inverting op-amp based amplifier.. or similar.

 Hello ! First and foremost, you can not use the circuitry that you have shown. You can not pull up a GPIO on PSoC to 6.6 V. On any GPIO, the maximum voltage that can appear is VDDIO+0.5V. 

However there is a cool feature in PSoC called, SIO. There are 8 SIOs in PSoC3/PSoC5. These pins can take a maximum voltage of 7V irrespective of what voltage is applied on VDDIOs.  These SIOs are spread from P12[0] to P12[7] one in each quadrant of the chip.

You circuit would straight away work with an SIO at 6.6V !

Your other possible option is to use external MOS or BJT or even Relay :D

Oh yes,the SIOs!

Nice one U2...A handy thing to keep in mind.

<goes to read up on SIOs>

AN60580 - SIO Tips and Tricks in PSoC® 3 / PSoC 5

http://www.cypress.com/?rID=40989

I'm so gonna read this after these exams get over.

Thank you for your reply.

I will try with SIO.

Thank you again.