Specifications

Rev. 2.1 EPSON 6–21
S1D12400 Series
S1D12400
Series
Reference setting value: R4: 100 k ohm to 1 M ohm
For resistance value R
4, we recommend that you set it to
an optimum value according to the liquid crystal panel
indication and the drive waveform.
R 4
V DD , V 0
C 2
V 1
V 2
V 3
V 4
V 5
R 4
R 4
R 4
S1D124
**
D
****
High power mode
The power circuit built-in the S1D12400 series is a LOW
power consumption type. (when the high power mode is
OFF)
Accordingly, in the case of a large load liquid crystal or
panel, the display quality may be degraded. In this case,
the display quality can be improved by entering HPM =
‘1’ by command. Before determining whether or not to
use this mode, it is recommended to make a display check
with a real machine.
In case the display quality cannot be improved
satisfactorily though the high power mode is set, a liquid
crystal drive power must be supplied from the outside.
Low Power Consumption Mode
The S1D12400 series is provided with the standby mode/
sleep mode to attain LOW power consumption in the
standby status of the unit.
● Standby mode
The standby mode is turned on and off by the power save
command and display off/booster circuit off command.
Only static icons can be displayed.
1. Liquid crystal display output
COM1 to COM32, COMS1, COMS2: V
DD level
SEG1 to SEG80: V
DD level
SEGSA, B, C, D, E, F, G, H, I, J, COMSA: Can be
caused to come on by static drive.
Control the static icon display by SEGSA, B, C, D,
E, F, G, H, I, J, COMSA by the static icon RAM.
2. Contents of DDRAM, CGRAM, and symbol register
The written contents are kept in memory regardless
of the ON/OFF status of the standby mode.
3. The operation mode remains in the status provided
before execution of the standby mode. The internal
circuit for dynamic display output is stopped.
4. Oscillating circuit
For static display, the oscillating circuit must be ON.
● Sleep mode
Turn off the power circuit and the oscillating circuit, set
‘0’ in all the data of the static icon register, and execute
the power save command.
Then, the sleep mode is set and the current consumption
can be reduced to a value close to the static current.
1. Liquid crystal display output
COM1 to COM32, COMS1, COMS2: V
DD level
SEG1 to SEG80, SEGS1, 2, 4, 5: V
DD level
SEGSA, B, C, D, E, F, G, H, I, J, COMSA: Set ‘0’
in all the data of the static icon register and blink ON/
OFF (for static icons).
2. Contents of SSRAM, CGRAM and symbol register
The written contents can be kept in memory regardless
of the ON/OFF status of the sleep mode.
3. The operation mode remains in the status provided
before execution of the sleep mode. All the internal
circuits are stopped.
4. Power circuit and oscillating circuit
Turn off the built-in power supply and oscillating
circuit by the power save command and the power
control command.
* Caution: If the oscillating circuit is stopped with the
static icon register data and blinking kept off, previous
display will remain on the icon. To avoid this, be sure
to turn off the data and blinking before stopping the
oscillating circuit.
Reset Circuit
When the RES input becomes active, this LSI will be put
into the initial setup status. Resetting is performed at the
LOW level of the RES input signal.
● Initial setup status
1. Line scroll register
LS1, 0 = 0 : Scroll amount 0 line
2. Line blink control
When driving a liquid crystal panel with heavy alternating
or direct current load using an internal power supply
circuit, we recommend that you connect an external
resistance in order to stabilize the level of the internal
voltage follower outputs V
1, V2, V3 and V4.