hd66717 Renesas Electronics Corporation., hd66717 Datasheet - Page 63

• Manufacturer Part Number: hd66717
• Description: Low-power Dot-matrix Liquid Crystal Display Controller/driver -
• Manufacturer: Renesas Electronics Corporation.

Annunciator Drive
Figure 37 shows annunciator drive output waveforms in two modes.
ASEG1
ASEG2
ASEG1
ASEG2
i) Normal mode and sleep mode
ACOM
ii) Standby mode (without oscillation)
ACOM
(Input)
Note: If annunciator display is unnecessary during standby mode, make sure to fix the EXM pin to the V
EXM
and set the annunciator display ON bit (DA) to 0. This will prevent dark display and liquid-cell deterioration due to
DC bias application on liquid crystal cells.
Figure 37 Annunciator Drive Output Waveforms
AGND level
V
V
V
V
V
V
CC
CC
CC
CC
CC
CC
level
level
level
level
level
level
AGND level
AGND level
AGND level
AGND level
AGND level
V
V
1 frame
1 frame
CC
CC
level
level
AGND level
AGND level
V
V
V
V
V
CC
CC
CC
CC
CC
level
level
level
level
level
CC
or GND level
Display off
Display on
Display off
Display on
HD66717
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