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UC1608XFAC

128x240 Matrix LCD Controller-Drivers

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UC1608

128x240 Matrix LCD Controller-Drivers

RESET & POWER MANAGEMENT

TYPES OF RESET

UC1608 has two different types of Reset:

Power-ON-Reset and System-Reset.

Power-ON-Reset is performed right after VDD is

connected to power. Power-On-Reset will first wait

for about ~15mS, depending on the time required

for VDD to stabilize, and then trigger the System

Reset.

System Reset can also be activated by software

command or by connecting RST pin to ground. In

the following discussions, Reset means System

Reset.

RESET STATUS

When UC1608 enters RESET sequence:

• Operation mode will be “Reset”

• System Status bits RS and BZ will stay as “1”

until the Reset process is completed. When

RS=1, the IC will only respond to Read Status

command. All other commands are ignored.

• All control registers are reset to default values.

Refer to Control Registers for details of their

default values.

OPERATION MODES

UC1608 has three operating modes (OM):

Reset, Normal, Sleep.

Mode

OM

Host Interface

Clock

LCD Drivers

Charge Pump

Draining Circuit

Reset

00

Active

OFF

OFF

OFF

ON

Sleep Normal

10

11

Active Active

OFF ON

OFF ON

OFF ON

OFF OFF

Table 11: Operating Modes

CHANGING OPERATION MODE

In addition to Power-ON-Reset, two commands will

initiate OM transitions:

Set Display Enable, and System Reset.

When DC[2] is modified by Set Display Enable, OM

will be updated automatically. There is no other

action required to enter Sleep mode.

For maximum energy utilization, Sleep mode is

designed to retain charges stored in external

capacitors CB0, CB1, and CL. To drain these

capacitors, use Reset command to activate the on-

chip draining circuit.

Action

Set Driver Enable to “0”

Set Driver Enable to “1”

Reset command or

RST_ pin pulled “L”

Power ON reset

Mode OM

Sleep 10

Normal 11

Reset 00

Table 12: OM changes

Even though UC1608 consumes very little energy

in Sleep mode (typically 5uA or less), however,

since all capacitors are still charged, the leakage

through COM drivers may damage the LCD over

the long term. It is therefore recommended to use

Sleep mode only for brief Display OFF operations,

such as full-frame screen updates, and to use

RESET for extended screen OFF operations.

EXITING SLEEP MODE

UC1608 contains internal logic to check whether

VLCD and VBIAS are ready before releasing COM

and SEG drivers from their idle states. When

exiting Sleep or Reset Mode, COM and SEG

drivers will not be activated until UC1608 internal

voltage sources are restored to their proper values.

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