UC1606
65x132 Matrix LCD Controller-Drivers
Version 1.32
27
RESET & POWER MANAGEMENT
TYPES OF RESET
UC1606 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 ~20mS, 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 UC1606 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
UC1606 has three operating modes (OM):
Reset, Normal, Sleep.
Mode
Reset
Sleep Normal
OM
00
10
11
Host Interface
Active
Active
Active
Clock
OFF
OFF
ON
LCD Drivers
OFF
OFF
ON
Charge Pump
OFF
OFF
ON
Draining Circuit
ON
OFF
OFF
Table 5: 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
Mode
OM
Set Driver Enable to “0”
Sleep
10
Set Driver Enable to “1”
Normal
11
Reset command or
RST_ pin pulled “L”
Power ON Reset
Reset
00
Table 6: OM changes
Even though UC1606 consumes very little energy
in Sleep mode (typically 5uA or less), 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
UC1606 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 UC1606 internal
voltage sources are restored to their proper values.
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