sed1355 ETC-unknow, sed1355 Datasheet - Page 345

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Epson Research and Development
Vancouver Design Center
6.8 Color TFT/D-TFD LCD Panel Support
6.9 CRT Support
6.10 Power Save Modes
6.11 Adjustable LCD Panel Negative Power Supply
6.12 Adjustable LCD Panel Positive Power Supply
SDU1355B0C Rev. 1.0 ISA Bus Evaluation Board User Manual
Issue Date: 98/10/30
The SED1355 supports 9, 12 and 18-bit active matrix color TFT/D-TFD panels. All the necessary
signals can also be found on the 40-pin LCD connector J6. The interface signals on the cable are
alternated with grounds to reduce crosstalk and noise.
When supporting an 18-bit TFT/D-TFD panel, the SED1355 can display 64K of a possible 256K
colors. A maximum 16 of the possible 18 bits of LCD data are available from the SED1355. Refer
to the SED1355 Hardware Functional Specification, document number X23A-A-001-xx for details.
Refer to Table 3-1 “LCD Signal Connector (J6)” on page 9 for connection information.
This evaluation board provides CRT support through the SED1355’s embedded RAMDAC. Refer
to the SED1355 Hardware Functional Specification, document number X23A-A-001-xx for details.
The SED1355 supports one hardware suspend and one software suspend Power Save Mode.
The software suspend mode is controlled by the utility 1355PWR Software Suspend Power
Sequencing.
The hardware suspend mode can be enabled by a memory read to location F00000h. A memory write
to the same location will disable it.
Most monochrome passive LCD panels require a negative power supply to provide between -18V
and -23V (I
integral part of this design. The signal VLCD can be adjusted by R29 to supply an output voltage
from -14V to -23V and is enabled/disabled by the SED1355 control signal LCDPWR#.
Determine the panel’s specific power requirements and set the potentiometer accordingly before
connecting the panel.
Most passive LCD passive color panels and most single monochrome 640x480 passive LCD panels
require a positive power supply to provide between +23V and +40V (I
mentation, such a power supply has been provided as an integral part of this design. The signal
VDDH can be adjusted by R23 to provide an output voltage from +23V to +40V and is
enabled/disabled by the SED1355 control signal LCDPWR#.
Determine the panel’s specific power requirements and set the potentiometer accordingly before
connecting the panel.
out
=45mA). For ease of implementation, such a power supply has been provided as an
out
=45mA). For ease of imple-
X23A-G-004-04
SED1355
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