Author Topic: C12864WC vs C12864LZ - Driving differences?  (Read 85 times)

bugfixin

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C12864WC vs C12864LZ - Driving differences?
« on: November 18, 2018, 05:17:14 PM »
Hi, I have a couple of PCBs I've made with extremely similar circuitry, the only difference is in the pinout / connector for the display, a 30 pin flat flex for C12864WC (NHD-C12864WC-FSW-FBW-3V3-M) and a 28 pin 0.05" header for C12864LZ (NHD-C12864LZ-FSW-FBW-3V3-ND).

Both are using a 4x booster circuit with 1uF ceramic caps, resulting in approximately 12.8V on the vout terminal, with the same capacitance on v0-v4, driven via "4-wire" SPI with the same software using the same configuration values.

The C12864WC has MUCH lower contrast, to the point that it's almost invisible, while the C12864LZ works perfectly. The datasheets do not mention any real differences in software settings (at least not that I've seen), is there a significantly different value (electronic volume, etc?) i should be setting for one vs the other?

 

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