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The problem of system-level project | Cypress Semiconductor

The problem of system-level project

Summary: 1 Reply, Latest post by graa on 08 May 2009 03:32 AM PDT
Verified Answers: 0
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liugy925's picture
1 post

I have tried to do the first system-level project as "Start page" showed, the result of simulation is right, but when I test in the PCB borad, some problem appear, when voltage lower than 0.75V ,LED is off, lower than 1.5V LED is blinking, higher 1.5V,LED is on, the voltage is half , Why?

graa's picture
Cypress Employee
223 posts

Which voltage input driver are you using and what are the thresholds used in changing the LED state? If you are using a 0-5V input, the actual voltage input on the pin of the PSoC should be 2.6V. You will have to use a potential divider at the input to scale down the 5V to 2.6V.

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