The LC75812PT is 1/8, 1/9 duty dot matrix LCD display controllers/drivers that support the display of characters, numbers, and symbols. In addition to generating dot matrix LCD drive signals based on data transferred serially from a microcontroller, the LC75812PT also provide on-chip character display ROM and RAM to allow display systems to be implemented easily. These products also provide up to 3 general-purpose output ports and incorporate a key scan circuit that accepts input from up to 35 keys to reduce printed circuit board wiring.
Features
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Key input function for up to 35 keys (A key scan is performed only when a key is pressed.)
Controls and drives a 5x7 or 5x8 dot matrix LCD.
Supports accessory display segment drive (up to 65 segments)
Display technique:
1/8 duty 1/4 bias drive (5x7 dots)
1/9 duty 1/4 bias drive (5x8 dots)
Display digits: 13 digits1 line (5x7 dots), 12 digits1 line (5x8 dots)
Display control memory
CGROM: 240 characters (5x7 or 5x8 dots)
CGRAM: 16 characters (5x7 or 5x8 dots)
ADRAM: 13x5 bits
DCRAM: 52x8 bits
Instruction function
Sleep mode can be used to reduce current drain.
Built-in display contrast adjustment circuit
Switching between key scan output and general-purpose output ports can be controlled with instructions.
PWM output for adjusting the LED backlight brightness
The frame frequency of the common and segment output waveforms can be controlled by instructions.
Serial data control of switching between the RC oscillator operating mode and external clock operating mode.
Independent LCD driver block power supply VLCD
A voltage detection type reset circuit is provided to initialize the IC and prevent incorrect display.
The INH pin is provided. This pin turns off the display, disables key scanning, and forces the general-purpose
