S1D12200 Epson Electronics America, Inc., S1D12200 Datasheet - Page 121

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

Identification of data bus signals
The S1D12300 series identifies data bus signals, as shown in Table 3, by combinations of A0 and WR (E).
Chip select
The S1D12300 series has a chip select pin (CS). Only when CS = LOW, MPU interfacing is enabled.
In any status other than Chip Select, D0 to D7 and A0, WR, SI and SCL inputs are invalidated. When a serial input interface
is selected, the shift register and counter are reset.
However, the Reset signal is input regardless of the CS status.
Power Circuit
This is a low-power-consumption power circuit that generates a voltage required for liquid crystal drive.
The power circuit consists of a boosting circuit, voltage regulating circuit and voltage follower.
The power circuit incorporated in the S1D12300 Series is set for a small-scale liquid crystal panel, so that its display quality
may be greatly deteriorated if it is used for a liquid crystal panel with a large display capacity.
In this case, an external power supply must be used.
A power circuit function can be selected by power control command. With this, an external power supply and a part of
the internal power supply can be used together.
Note 1: When the boosting circuit is turned off, make boosting system pins (CAP1+, CAP1-, CAP2+, CAP2-) open
Note 2: When the voltage regulating circuit is not used with the boosting circuit OFF, make the boosting system pins
Note 3: When all the internal power supplies are turned off, supply liquid crystal drive voltages V
Rev. 1.9
Note 1
Note 2
Note 3
and give a liquid crystal drive voltage to the V
open, connect between the V
V
5
from the outside, and make the CAP1+, CAP1-, CAP2+, CAP2- and V
Common
Boosting
SCL
CS
circuit
S1
A0
A0
1
0
68 series
Voltage regulat-
E
ing circuit
1
1
1
5
D7
pin and V
2
80 series
D6
WR
OUT
0
0
3
pin, and give a liquid crystal drive voltage from the outside.
D5
Voltage
follower
EPSON
Table 3
OUT
Fig. 1
4
pin from the outside.
Writing to RAM and symbol register
Writing to internal register (command)
D4
5
V
D3
voltage input
1
, V
V
External
5
6
2
V
, V
= V
—
OUT
D2
Function
3
, V
OUT
7
4
, V
OUT
D1
5
pins open.
8
system pin
Boosting
D0
OPEN
OPEN
OPEN
S1D12300 Series
9
1
D7
, V
2
, V
3
, V
4
and
4–17