LC75838E Datasheet, PDF (14/32 Pages) Sanyo Semicon Device – 1/8 to 1/10 Duty General-Purpose LCD Display Drivers

LC75838E, 75838W
Control Data Functions
1. PC1 to PC3: General-purpose output port state setting data
These control data bits set the states of the general-purpose output ports P1 to P3.
Output pin
P1
P2
P3
General-purpose output port state setting data PC1 PC2 PC3
For example, if PC1 and PC2 are set to 1, and PC3 is set to 0, then the output pins P1 and P2 will output high levels
(V_DD) and the output pin P3 will output low level (V_SS).
2. CT0 to CT3, CTC: Display contrast setting data
These control data bits set the display contrast.
CT0 to CT3: Display contrast setting (11 steps)
CT0
0
1
0
1
0
1
0
1
0
1
0
CT1
0
0
1
1
0
0
1
1
0
0
1
CT2
0
0
0
0
1
1
1
1
0
0
0
CT3
0
0
0
0
0
0
0
0
1
1
1
LCD drive 4/4 bias voltage supply V_LCD0 level
0.94 V_LCD = V_LCD – (0.03 V_LCD × 2)
0.91 V_LCD = V_LCD – (0.03 V_LCD × 3)
0.88 V_LCD = V_LCD – (0.03 V_LCD × 4)
0.85 V_LCD = V_LCD – (0.03 V_LCD × 5)
0.82 V_LCD = V_LCD – (0.03 V_LCD × 6)
0.79 V_LCD = V_LCD – (0.03 V_LCD × 7)
0.76 V_LCD = V_LCD – (0.03 V_LCD × 8)
0.73 V_LCD = V_LCD – (0.03 V_LCD × 9)
0.70 V_LCD = V_LCD – (0.03 V_LCD × 10)
0.67 V_LCD = V_LCD – (0.03 V_LCD × 11)
0.64 V_LCD = V_LCD – (0.03 V_LCD × 12)
CTC: Display contrast adjustment circuit state setting
CTC
0
1
Display contrast adjustment circuit state
The display contrast adjustment circuit is disabled, and the V_LCD0 pin level is forced to the V_LCD level.
The display contrast adjustment circuit operates and the display contrast is adjusted.
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_LCD4 pin and
modifying the V_LCD4 pin voltage. However, the following conditions must be met: (V_LCD0 – V_LCD4) ≥ 4.5 V, and 1.5 V
≥ V_LCD4 ≥ 0 V.
No. 6902-14/32