LC75817E Datasheet, PDF (33/43 Pages) Sanyo Semicon Device – 1/8 to 1/10 Duty Dot Matrix LCD Display Controller/Driver with Key Input Function

LC75817E, 75817W
Sample Application Circuit 3
1/9 duty, 1/4 bias drive technique (for use with normal panels)
*22
LCD panel
C ≥ 0.047 µF
From the
controller
To the
controller
To the
controller
*25
power supply
*23
*24
(general-purpose output ports)
used with the backlight controller
or other circuit
Key matrix
(up to 30 keys)
Notes: *22. Add a capacitor to the logic block power supply line so that the logic block power supply voltage V_DD rise time when power is applied and the
logic block power supply voltage V_DD fall time when power drops are both at least 1 ms, as the LC75817E/W is reset by the VDET.
*23. If a variable resistor is not used for display contrast fine adjustment, the V_LCD4 pin must be connected to ground.
*24. If the INH pin is not used, it must be connected to the logic block power supply V_DD.
*25. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 kΩ) appropriate for the capacitance of
the external wiring so that signal waveforms are not degraded.
No. 6144-33/43