lc75804e Sanyo Semiconductor Corporation, lc75804e Datasheet - Page 34

• Manufacturer Part Number: lc75804e
• Description: 1/3, 1/4 Duty Lcd Display Drivers With Key Input Function
• Manufacturer: Sanyo Semiconductor Corporation

From the controller
Sample Application Circuit 8
1/4 duty, 1/3 bias (for use with large panels)
Notes:*9. 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
When using the LC75804E/W in 1/3 duty, applications transfer the display data (D1 to D228) in three operations, and in
1/4 duty, they transfer the display data (D1 to D300) in four operations. In either case, applications should transfer all of
the display data within 30 ms to maintain the quality of the displayed image.
To the controller
To the controller
power supply
*10. If the RES pin is not used for system reset, it must be connected to the logic block power supply V
*11. 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
block power supply voltage V
the external wiring so that signal waveforms are not degraded.
+5.5V
10 kΩ ≥ R ≥ 1 kΩ
C ≥ 0.047 µF
+5V
*11
C
C
DD
*9
fall time when power drops are both at least 1 ms, as the LC75804E/W is reset by the VDET.
R
R
R
VDD
VSS
TEST
VLCD
VLCD1
VLCD2
RES
CE
CL
DI
DO
LC75804E, LC75804W
*10
K
5
I
K
4
I
K
3
I
OSC
K
2
I
K
1
I
K
S
6
K
S
5
K
S
4
K
S74/COM4
S
3
K
S
7
6
/
S
2
K
S
7
5
/
S
1
COM1
COM2
COM3
P1/S1
P2/S2
P8/S8
S73
Key matrix
(up to 30 keys)
S9
DD
DD
.
rise time when power is applied and the logic
(S75)
(S76)
(P1)
(P2)
(P8)
(general-purpose output ports)
Used with the backlight
controller or other circuit.
No. 6266-34/37