Page 16 Epson Research and Development
Vancouver Design Center
S1D13504 S5U13504B00C Rev.1.0 ISA Bus Evaluation Board User Manual
X19A-G-004-06 Issue Date: 01/02/02
6.10 Power Save Modes
The S1D13504F00A supports one hardware and one software suspend Power Save Mode.
The hardware suspend mode is not supported by the S5U13504B00C.
The software suspend mode is controlled by the utility 13504PWR Software Suspend Power
Sequencing.
6.11 Core V
DD
Power Supply
An independent fixed 3.3V power supply for Core V
DD
is provided. A National LP2960AIN-3.3
voltage regulator is used for the power supply and is capable of supplying 500mA @ 3.3V.
6.12 IO V
DD
Power Supply
The IO V
DD
voltage is selectable between 3.3V and 5.0V through jumper JP2. For the 5.0V host bus
interface, select IO V
DD
at 5.0V, and for the 3.3V host bus interface, select IO V
DD
at 3.3V.
Refer to Table 2-3 “Jumper Settings,” on page 8.
6.13 Adjustable LCD Panel Negative Power Supply
Most monochrome passive LCD panels require a negative power supply to provide between -18V
and -23V (I
out
=45mA). For ease of implementation, such a power supply has been provided as an
integral part of this design. The signal VLCD can be adjusted by R37 to supply an output voltage
from -14V to -23V and is enabled/disabled by the S1D13504 control signal LCDPWR.
Determine the panel’s specific power requirements and set the potentiometer accordingly before
connecting the panel.
6.14 Adjustable LCD Panel Positive Power Supply
Most passive LCD passive color panels and most single monochrome 640x480 passive LCD panels
require a positive power supply to supply between +23V and +40V (I
out
=45mA). For ease of imple-
mentation, such a power supply has been provided as an integral part of this design. The signal
VDDH can be adjusted by R31 to provide an output voltage from +23V to +40V and is
enabled/disabled by the S1D13504 control signal LCDPWR.
Determine the panel’s specific power requirements and set the potentiometer accordingly before
connecting the panel.
