The µPD16431A 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 µPD16431A 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 µPD16431A is ideal for applications in the front panel of an automobile stereo system.

FEATURES
• Various display modes
    1/2 duty: 112 segment outputs or 96 segment outputs + 8 LED outputs
    1/3 duty: 168 segment outputs or 144 segment outputs + 8 LED outputs
    1/4 duty: 224 segment outputs or 192 segment outputs + 8 LED outputs
• Key scan circuit (key source outputs are shared with LCD driver outputs)
• Independent LCD driver power supply VLCD (can be set to VDD to 6.5 V)
• Serial data input/output (SCK, STB, DATA)
• On-chip oscillator incorporated
• Power-ON reset circuit