Hey,
I have been using 16x2 LCD display for a long time, but now i notice something new. There are some new footprints at the backside of the LCD for a IC and few capacitors and jumpers. So does anyone here know what these footprints are for?
I am adding the picture below for your reference
I can clearly see for myself that U3 is for an IC chip and J1, J2 J3 are for jumpers which has to be changed based on aplication.
But, my question is why is U3 not occupied? When should I use U3 and what IC will go there?
I am able to get my LCD working normally with Arduino uno, just qurious to know why this option is there on the LCD
You can use a switched-capacitor voltage converter like the L7660 or MAX660 IC in place of U3 and operate the LCD module with only 3.3V operating voltage. It will be useful when you do not have a 5V voltage available for your design. The capacitor C1 and C2 are just 10uF cap that supports the working of voltage converter IC. Also when using in 3.3V mode Jumper J1 should be opened and J3 should be closed
By default without any change the LCD is will work fine on 5V systems, like in your case it works normal with the arduino uno
Ashwinth is right. I was wrong. I should give it a try and check the output... Got something interesting.
Sourav Gupta
PermalinkThose are used to add additional address id using the U3 chip, in such case the Jumper J1, J2 and J3 needs to be changed or needs to be configured.
This is unpopulated because it is not required but the manufacturer used the footprint if this is required in future or had been used in the past but changed due to the changes in mcu technology U1 and U2.
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Joined February 12, 2018 696Monday at 02:11 PM