Ordering number : E*N7980 LC75857E LC75857W Advance Information CMOS LSI 1/3, 1/4 Duty LCD Driver with Key Input Function http://onsemi.
com Overview The LC75857E and LC75857W are 1/3 duty and 1/4 duty LCD display drivers that can directly drive up to 164 segments and can control up to four general-purpose output ports.
These products also incorporate a key scan circuit that accepts input from up to 30 keys to reduce printed circuit board wiring.
Features  Key input function for up to 30 keys (A key scan is performed only when a key is pressed.
)  1/3 duty and 1/4 duty drive schemes can be controlled from serial data.
 1/2 bias and 1/3 bias drive schemes can be controlled from serial dat...

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