LC75804E, LC75804W
Sample Application Circuit 2
1/3 duty, 1/2 bias (for use with large panels)
+5V
*9
10 kΩ ≥ R ≥ 1 kΩ
C ≥ 0.047 µF
+5.5V
R
CR
From the controller
To the controller
To the controller
power supply
*11
VDD
VSS
TEST
VLCD
VLCD1
VLCD2
OSC
COM1
COM2
COM3
P1/S1
P2/S2
P8/S8
S9
S73
COM4/S74
RES *10
CE
CL
DI K K K K K
DO
IIIII
54321
SS
77
65
//
KKKKKK
SSSSSS
654321
(P1)
(P2)
(P8)
(general-purpose output ports)
Used with the backlight
controller or other circuit.
(S75)
(S76)
Key matrix
(up to 30 keys)
Notes:*9. Add a capacitor to the logic block power supply line so that the logic block power supply voltage VDD rise time when power is applied and the logic
block power supply voltage VDD fall time when power drops are both at least 1 ms, as the LC75804E/W is reset by the VDET.
*10. If the RES pin is not used for system reset, it must be connected to the logic block power supply VDD.
*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
the external wiring so that signal waveforms are not degraded.
No. 6266-28/37