To drive the display, you will need 3 to 5 digital output pins
(depending on whether you want to manually control the chip select and
reset lines). Another pin can be used to control (via on/off or PWM) the
backlight - the backlight LEDs are wired to a transistor.
The display driver is a PCD8544 chip, and it runs at 3.3V so you'll need
a 3V supply handy (you don't need that much current though, maybe 10mA
tops). Logic levels must be 3V to prevent damage but we include a free level shifter chip so you can easily connect it to 5V logic such as an Arduino.
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