Lcd Driver; Configuration Of Lcd Driver - Epson E0C6006 Technical Manual

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)

4.7 LCD Driver

4.7.1 Configuration of LCD driver

The E0C6006 has four common terminals (COM0–COM3) and 20 segment terminals (SEG0–SEG19), so
that an LCD with a maximum of 80 (20 × 4) segments can be driven.
The driving method is 1/4 duty (1/3 duty can also be selected by mask option) dynamic drive, adopting
the four types of potential, V
The power for driving the LCD is generated by the internal circuit so that there is no need to apply power
especially from outside.
The frame frequency is 32 Hz for 1/4 duty and 42.7 Hz for 1/3 duty (in the case of f
Figures 4.7.1.1 and 4.7.1.2 show the drive waveform for 1/3 duty and 1/4 duty.
Duty
1/4
1/3
COM0
COM1
COM2
COM3
SEG0
–SEG19
Frame frequency
24
, V , V and V .
DD L1 L2 L3
Table 4.7.1.1 LCD drive mode options
COM used Max. number of segments
80 (20 × 4)
COM0–COM3
60 (20 × 3)
COM0–COM2
Fig. 4.7.1.1 Drive waveform for 1/3 duty
EPSON
OSC1
Frame frequency *
32 Hz
42.7 Hz
∗ When f
= 32 kHz
OSC1
V LCD status
DD
V
L1
COM0
V
L2
COM1
V
L3
COM2
SEG0–19
V
DD
V
L1
V
L2
V
L3
E0C6006 TECHNICAL MANUAL
= 32.768 kHz).
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