S1D12200 Epson Electronics America, Inc., S1D12200 Datasheet - Page 73

• Manufacturer Part Number: S1D12200
• Description: S1d12000 Series Lcd Driver Ic Technical Manual Technical Manual
• Manufacturer: Epson Electronics America, Inc.

Voltage regulator
• Voltage regulator using the electronic control function
V
External unit connection examples
An external voltage regulation capacitor must be
connected to the LCD power pin. The LCD drive
voltages are fixed to 1/4 biasing.
1/4 bias example
Rev. 1.1
5
Use the electronic control function and set the voltages
appropriate to the LCD panel driving.
When a 5-bit data is set in the electronic control
register, one of 32-state voltages can be set for LCD
driving. Before using the electronic control function,
turn ON the power circuit by issuing the power
control command.
The following explains how to calculate the voltages
using the electronic control function.
Note:
Reference set value: (0.1~1.0 F)
= 4
Conditions:
V
where,
This is reference voltage for the liquid
crystal drive power circuit. The V
a temperature characteristics of about
–0.05%/deg.
No. Electronic control register
30
31
EV
S1D12205
0
1
2
3
•
•
X = n (n=0, 1, ..., 31)
Series
= V
V
= V
We recommend to display the capacitance
appropriate to the LCD panel size and set
up the capacitance by observing the drive
signal waveforms.
EV
REG2
REG2
(0, 0, 0, 0, 0)
(0, 0, 0, 0, 1)
(0, 0, 0, 1, 0)
(0, 0, 0, 1, 1)
(1, 1, 1, 1, 0)
(1, 1, 1, 1, 1)
– X
/95
V
V
OCA
OCC
OCD
OCB
OCE
REG1
REG2
•
•
V
V
DD
V
V
V
V
SS
1
3
4
5
n-1
1
2
3
n
X
0
•
•
REGZ
Large
Small
V
has
•
•
•
•
•
•
5
EPSON
Power Save mode
The S1D12205 Series supports the Standby and Sleep
modes to save the power consumption during system
idling.
• Standby mode
• Sleep mode
The Standby mode is selected or released by the
Power Save command. During Standby mode, only
the static icon is displayed.
1. LCD display outputs
2. DDRAM, CGRAM and symbol register
3. The operation mode before selection of Standby
4. Oscillator
To select the Sleep mode, turn OFF the power circuit
and oscillator by issuing the command, and clear all
data of Static Icon register to zero. Then, issue the
Power Save command.
consumption will be minimized to almost the stopped
status.
1. LCD display outputs
2. DDRAM, CGRAM and symbol register
3. The operation mode before selection of Standby
4. Oscillator
COM1 to COM16, COMS1, COMS2:
SEG1 to SEG60, SEGS1, 2, 4, 5:
SEGSA, B, C, D, E, F, G, H, I, J, COMSA:
Use the Static Icon RAM to display the static icon
with SEGSA, B, C, D, E, F, G, H, I, J and COMSA.
Their write contents do not change. The contents
are kept regardless of Standby mode selection or
release.
mode is kept.
The internal circuits for dynamic display are
stopped.
The oscillator must be turned ON for static display.
COM1 to COM16, COMS1, COMS2:
SEG1 to SEG60, SEGS1, 2, 4, 5:
SEGSA, B, C, D, E, F, G, H, I, J, COMSA:
Their write contents do not change. The contents
are kept regardless of Standby mode selection or
release.
mode is kept.
All internal circuits are stopped.
Turn OFF the built-in power supply and oscillator
by issuing the Power Save and power control
commands.
V
V
Can light by static drive
V
V
Clear all data of Static
Icon register to zero.
DD
DD
DD
DD
level
level
level
level
S1D12205 Series
The system power
3–11