onsemi LC75857WS-E

The LC75857E and LC75857W are 1/3-duty and 1/4-duty LCD display drivers capable of directly driving up to 164 segments and controlling up to four general-purpose output ports. These devices also integrate a key scan circuit that accepts input from up to 30 keys, reducing PCB wiring complexity.

• Key input support for up to 30 keys (key scan performed only when keys are pressed)
• 1/3 duty and 1/4 duty drive schemes selectable via serial data
• 1/2 bias and 1/3 bias drive schemes selectable via serial data
• Drives up to 126 segments at 1/3 duty, up to 164 segments at 1/4 duty
• Sleep mode and all-segment-off function controllable via serial data
• Switching between key scan output and segment output controllable via serial data
• Key scan operation enable/disable controllable via serial data
• Switching between segment output port and general-purpose output port controllable via serial data
• Frame frequency of COM and segment output waveforms controllable via serial data
• Switching between RC oscillator mode and external clock mode controllable via serial data
• Serial data I/O supports CCB format communication with system controller
• Direct display of display data without decoder, offering high versatility
• LCD driver module with independent VLCD (when logic supply voltage VDD is in the range of 3.6 to 6.0V, VLCD can be set to 0.75×VDD to 6.0V; when VDD is in the range of 2.7 to 3.6V, VLCD can be set to 2.7 to 6.0V)
• On-chip voltage detection reset circuit to prevent display errors