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The PCF8538 is a fully featured Chip‑On‑Glass (COG) Liquid Crystal Display (LCD)
driver, designed for high-contrast Vertical Alignment (VA) LCD with multiplex rates up to
1:9. It generates the drive signals for a static or multiplexed LCD containing up to
9 backplanes, 102 segments, and up to 918 elements. The PCF8538 features an internal
charge pump with internal capacitors for on‑chip generation of the LCD driving voltage. To
ensure an optimal and stable contrast over the full temperature range, the PCF8538 offers
a programmable temperature compensation of the LCD supply voltage. The PCF8538
can be easily controlled by a microcontroller through either the two-line I²C‑bus or a
four‑line bidirectional SPI‑bus.