
UC1606
65x132 Matrix LCD Controller-Drivers
Version 1.32
27
R
ESET
& P
OWER
M
ANAGEMENT
T
YPES OF
R
ESET
UC1606 has two different types of Reset:
Power-ON-Reset
and
System-Reset
.
Power-ON-Reset
is performed right after V
DD
is
connected to power.
Power-On-Reset
will first wait
for about ~20mS, depending on the time required
for V
DD
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
.
R
ESET
S
TATUS
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.
O
PERATION
M
ODES
UC1606 has three operating modes (OM):
Reset, Normal, Sleep.
Mode
OM
Reset
00
Active
OFF
OFF
OFF
ON
Sleep Normal
10
Active
OFF
OFF
OFF
OFF
11
Host Interface
Clock
LCD Drivers
Charge Pump
Draining Circuit
Active
ON
ON
ON
OFF
Table 5:
Operating Modes
C
HANGING
O
PERATION
M
ODE
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 C
B0
, C
B1
, and C
L
. To drain these
capacitors, use Reset command to activate the on-
chip draining circuit.
Action
Mode
Sleep
Normal
OM
10
11
Set Driver Enable to “0”
Set Driver Enable to “1”
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.
E
XITING
S
LEEP
M
ODE
UC1606 contains internal logic to check whether
V
LCD
and V
BIAS
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.