LCD CONTROLLER/DRIVER KS57C2308/P2308/C2316/P2316
12-8
COMMON (COM) SIGNALS
The common signal output pin selection (COM pin selection) varies according to the selected duty cycle. You
must therefore be open any unused COM pins according to this guideline:
In static mode, be open the COM1, COM2, and COM3 pins
In 1/2 duty mode, be open the COM2 and COM3 pin
In 1/3 duty mode, be open the COM3 pin
Table 12-6. Common Signal Pins Used Per Duty Cycle
Display Mode COM0 Pin COM1 Pin COM2 Pin COM3 Pin
Static Selected N/C N/C N/C
1/2 duty Selected Selected N/C N/C
1/3 duty Selected Selected Selected N/C
1/4 duty Selected Selected Selected Selected
NOTE: “NC” means that no connection is required.
V
LCD
T
f
= T
COM0 V
LC0
V
SS
T: LCDCK
T
f
: Frame frequency
Figure 12-5. LCD Common Signal Waveform (Static)