lc75857e Sanyo Semiconductor Corporation, lc75857e Datasheet - Page 30

• Manufacturer Part Number: lc75857e
• Description: 1/3, 1/4 Duty Lcd Display Drivers With Key Input Function
• Manufacturer: Sanyo Semiconductor Corporation

Sample Application Circuit 2
1/3 duty, 1/2 bias (for use with large panels)
Notes:*10. Add a capacitor to the logic block power supply line so that the logic block power supply voltage V
From the controller
To the controller
To the controller
power supply
*11. When RC oscillator mode is used, the external resistor Rosc and the external capacitor Cosc must be connected between the OSC pin and
*12. 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
ground, and when external clock mode is selected the current protection resistor Rg (4.7 to 47 kΩ) must be connected between the OSC pin and
the external clock output pin (external oscillator). (See the section on the OSC pin peripheral circuit.)
the external wiring so that signal waveforms are not degraded.
10 k
C
0.047 F
+3V
+5V
R
1 k
*12
C
DD
*10
fall time when power drops are both at least 1 ms, as the LC75857E/W is reset by the VDET.
R
R
VDD
VSS
TEST
VLCD
VLCD1
VLCD2
CE
CL
DI
DO
LC75857E, LC75857W
K
I
5
K
I
4
K
I
3
OSC
*11
K
I
2
K
I
1
K
S
6
K
S
5
K
S
4
COM4/S39
S
4
2
/
K
S
3
S
4
1
/
K
S
2
S
4
0
/
K
S
1
COM1
COM2
COM3
P1/S1
P2/S2
P3/S3
P4/S4
S38
S5
Key matrix
(up to 30 keys)
DD
(S40)
(S41)
(S42)
(P1)
(P2)
(P3)
(P4)
rise time when power is applied and the logic
(general-purpose output ports)
Used with the backlight
controller or other circuit.
No. 7980-30/39