The PD16431A is an LCD controller/driver that enables display of segment type LCDs of 1/2, 1/3, or 1/4 duty cycle. This controller/driver has 56 segment output lines of which eight can also be used as LED output lines. Because the LCD driver contained in the PD16431A has separate logic and power supply, up to 6.5 V of LCD drive voltage can be set. In addition, key source output lines for key scanning and key input data lines are also provided, so that the PD16431A is ideal for applications in the front panel of an automobile stereo system.