lc75808e Sanyo Semiconductor Corporation, lc75808e Datasheet - Page 14

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

Control Data Functions
1. KC1 to KC6: Key scan output state setting data
For example, if KC1 to KC3 are set to 1, and KC4 to KC6 are set to 0, then the output pins KS1 to KS3 will output high
levels (V
Note that key scan output signal is not output from output pins that are set low.
2. PC1 to PC4: General-purpose output port state setting data
For example, if PC1 and PC2 are set to 1, and PC3 and PC4 are set to 0, then the output pins P1 and P2 will output high
levels (V
3. CT0 to CT3, CTC: Display contrast setting data
CTC: Display contrast adjustment circuit state setting
Note that although the display contrast can be adjusted by operating the built-in display contrast adjustment circuit, it is
also possible to apply fine adjustments to the contrast by connecting an external variable resistor to the V
modifying the V
≥ V
Key scan output state setting data
General-purpose output port state setting data
CTC
CT0
0
1
0
1
0
1
0
1
0
1
0
0
1
These control data bits set the states of the key scan output pins KS1 to KS6.
These control data bits set the states of the general-purpose output ports P1 to P4.
These control data bits set the display contrast.
CT0 to CT3: Display contrast setting (11 steps)
LCD
4 ≥ 0 V.
The display contrast adjustment circuit is disabled, and the V
The display contrast adjustment circuit operates, and the display contrast is adjusted.
DD
DD
CT1
Output pin
0
0
1
1
0
0
1
1
0
0
1
) and the output pins KS4 to KS6 will output low levels (V
) and the output pins P3 and P4 will output low levels (V
Output pin
CT2
LCD
0
0
0
0
1
1
1
1
0
0
0
4 pin voltage. However, the following conditions must be met: (V
CT3
0
0
0
0
0
0
0
0
1
1
1
LCD drive 4/4 bias voltage supply V
0.94 V
0.91 V
0.88 V
0.85 V
0.82 V
0.79 V
0.76 V
0.73 V
0.70 V
0.67 V
0.64 V
KC1
KS1
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
KC2
KS2
= V
= V
= V
= V
= V
= V
= V
= V
= V
= V
= V
PC1
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
P1
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
– (0.03 V
Display contrast adjustment circuit state
KS3
KC3
PC2
P2
LC75808E, 75808W
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
KS4
KC4
PC3
P3
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
LCD
LCD
0 pin level is forced to the V
KS5
KC5
0 level
PC4
P4
KC6
KS6
SS
SS
).
) in the key scan standby state.
LCD
level.
LCD
0 – V
LCD
4) ≥ 4.5 V, and 1.5 V
LCD
No. 6370 -14/39
4 pin and