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Output level from serial LCD (CFA635-xxx-KL)

tedmarshall

New member
We are using the serial version of the CFA635 in a new design and are using the logic-level interface (not using the RS232 converter board). I just discovered that the logic output from the module goes to +5V. This is a problem as the device we are connecting to the module (as are most modern SOCs with built-in UARTS) is not 5-volt tolerant. I understand that we will need to rev the design to include a level-converter on this line. However, for working with our prototype, is there any reasonable way to reduce the output level to <= +3.3V? (We can change surface-mount resistors.)

Also, your datasheet, CFA635TFEKL_v1.0.pdf, does not list logic output levels, only input levels. At a minimum, I'd suggest I'd suggest adding this.

You should also consider designing a new model which is more friendly to new designs.

Thank you.
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tedmarshall

New member
Also, what is the maximum output current for the logic output? We need that for trying a simple voltage divider.

Thanks.
 

CF Tech

Administrator
The KL versions just expose the UART pins of the microcontroller.

Here is the table from the microcontroller:

 

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