HT0324A Tomato LSI, Inc., HT0324A Datasheet - Page 44

• Manufacturer Part Number: HT0324A
• Description: 65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
• Manufacturer: Tomato LSI, Inc.

HT0324A
TOMATO LSI Inc.
-Standby Mode
The duty LCD display system operations are halted and only the static drive system for the indicator
continues to operate, providing the minimum required consumption current for the static drive.
The internal modes are in the following states during standby mode.
7-22. Power save (Compound instruction).
If the entire display ON / OFF instruction is issued during the display OFF state, HT0324A enters the
power save status to reduce the power consumption to the static power consumption value. According to
the status of static indicator mode, power save is entered to one of two modes (sleep and standby mode).
When static indicator mode is ON, standby mode is issued, when OFF, sleep mode is issued. Power save
mode is released by the display OFF instruction.
-Sleep Mode
a. The oscillator circuit and the LCD power supply circuit are halted.
b. All liquid crystal drive circuits are halted, and the segment in common drive outputs output a VSS level.
a. The LCD power supply circuits are halted. The oscillator circuit continues to operate.
b. The duty drive system liquid crystal drive circuits are halted and the segment and common drive outputs
This stops all operations in the LCD display system, and as long as there are no access from the MPU,
the consumption current is reduced to a value near the static current. The internal modes during sleep
mode are as follows:
0
P o w er sa ve O F F (C om pound instruction)
0
[LC D
[LC D p o w er sup ply circu it:O F F ]
[C onsum ption
65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
[C onsum ption curren t:< 2 A ]
[O scillator circuit: O F F ]
[O scillator
O
2 B ytes C om m and
R elea se sleep m o d e
[A ll C O M /S E G : V S S ]
[A ll
R elea se
[S tatic indica tor O N ]
S tatic in dicator O F F
[E ntire d ispla y O F F ]
d
S leep m o d e
S leep m o d e
1
44
C O M /S E G
p o w er
curren t:A>
circuit:
sleep
P o w er sa ve(C om pound instructio n)
0
Figure 7-5. Power save routine
sup ply
:
[E ntire d ispla y O N ]
[D ispla y O F F ]
0
1
[C onsum ption curren t: <10 A ]
[LC D
[C onsum ption
[LC D p o w er sup ply circu it:O F F ]
R elea se stan d b y m o d e
R elea se
[O scillator circuit: O N ]
[A ll C O M /S E G : V S S ]
[O scillator
O
[A ll
[E ntire d ispla y O F F ]
S tatic in dicator O N
P o w er sa ve O F F
X
d
S tan d b y
S tan d b y
d
d
C O M /S E G
p o w er
X
stan d b y
curren t:A >
circuit:
sup ply
Ver 0.0
:
X
X