lc75808e Sanyo Semiconductor Corporation, lc75808e Datasheet - Page 36

• Manufacturer Part Number: lc75808e
• Description: 1/8 To 1/10 Duty Lcd Display Drivers With Key Input Function
• Manufacturer: Sanyo Semiconductor Corporation

Sample Application Circuit 6
1/10 duty, 1/4 bias drive technique (for use with large panels)
Note: *6. Add a capacitor to the logic block power supply line so that the logic block power supply voltage V
Notes on Transferring Display Data from the Controller
The display data is transferred to the LC75808E/W in four operations. All of the display data should be transferred within
30 ms to maintain the quality of the displayed image.
From the controller
To the controller
To the controller
power supply
+8 V
+5 V
C ≥ 0.047 µF
10 kΩ ≥ R ≥ 2.2 kΩ
*7. If a variable resistor is not used for display contrast fine adjustment, the V
*8. If the function of the INH pin is not used, the INH pin must be connected to the logic block power supply V
*9. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 kΩ to 10 kΩ) appropriate for the capacitance
logic block power supply voltage V
of the external wiring so that signal waveforms are not degraded.
*6
*9
DD
fall time when power drops are both at least 1 ms, as the LC75808E/W is reset by the VDET.
*8
*7
LC75808E, 75808W
LCD
Key matrix
(up to 30 keys)
4 pin must be connected to ground.
general-purpose output ports
Used with the backlight
controller or other circuit.
DD
rise time when power is applied and the
DD
.
LCD panel
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