S1D12200 Epson Electronics America, Inc., S1D12200 Datasheet - Page 161

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

S1D12304/12305 Series
Identification of data bus signals
The S1D12304/12305 series identifies data bus signals, as shown in Table 3, by combinations of A0 and WR (E).
Chip select
The S1D12304/12305 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 S1D12304/12305 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
Note 2
Note 3
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
5–12
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
circuit
SCL
CS
S1
A0
A0
1
0
Voltage regulat-
68 series
ing circuit
E
1
1
1
5
D7
pin and V
2
80 series
D6
WR
OUT
0
0
3
follower
Voltage
D5
pin, and give a liquid crystal drive voltage from the outside.
EPSON
Table 3
OUT
Fig. 1
4
pin from the outside.
D4
Writing to RAM and symbol register
Writing to internal register (command)
5
V
voltage input
D3
1
, V
V
External
5
2
V
6
, V
= V
—
OUT
D2
3
Function
, V
OUT
4
7
, V
D1
OUT
5
pins open.
8
system pin
Boosting
D0
OPEN
OPEN
OPEN
9
D7
1
, V
2
, V
3
, V
Rev. 2.4
4
and