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PSoC™ 4

Level 2
25 sign-ins 10 sign-ins 5 replies posted
Level 2


I am using a CY8C4126AXI-S445 and want to drive an LCD with 4 COMs and 18 SEGs.

It seems to work with a PWM driving mode and a 1/4 Bias in High Speed mode.

To save battery I want to use Digital correlation mode as the current is supposed to be much lower in this mode.

But with digital correlation all the segments on the LCD are always on. I can't switch them off using LCD_WritePixel or similar functions.

What can I do to make it work?

PS: I already found this thread https://community.cypress.com/t5/PSoC-4-MCU/Segment-LCD-Drive-in-Low-Speed-Mode-on-PSoC4100S/m-p/175... but it didn't solve my problem.

1 Reply
Moderator 250 replies posted 250 sign-ins 100 replies posted

Hi @Bigby ,

Going through your problem statement explained, I might consider that you would have already gone through this app note here : https://www.cypress.com/file/137731/download which gives a thorough read on the PSoC 4 Segment LCD Drive mode and the low power operations of LCD.

Also, Can you please attach the datasheet of the LCD that you are using? It will help us dig in the issue and get to the solution.

Best Regards,