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Page 18 Epson Research and Development
Vancouver Design Center
S1D13705 S5U13705B00C Rev. 1.0 ISA Bus Evaluation Board User Manual
X27A-G-005-03 Issue Date: 01/02/13
6.11 Adjustable LCD Panel Negative Power Supply
For those LCD panels requiring a negative power supply to provide between -23V and -
14V (I
out
=25mA) a power supply has been provided as an integral part of this design. The
VLCD power supply can be adjusted by R21 to give an output voltage from -23V to -14V,
and is enabled and disabled by the active high S1D13705 control signal LCDPWR, inverted
externally.
Determine the panel’s specific power requirements and set the potentiometer accordingly
before connecting the panel.
6.12 Adjustable LCD Panel Positive Power Supply
For those LCD panels requiring a positive power supply to provide between +23V and
+40V (I
out
=45mA) a power supply has been provided as an integral part of this design. The
VDDH power supply can be adjusted by R15 to provide an output voltage from +23V to
+40V and is enabled and disabled by the active high S1D13705 control signal LCDPWR,
inverted externally.
Determine the panel’s specific power requirements and set the potentiometer accordingly
before connecting the panel.
6.13 CPU/Bus Interface Header Strips
All of the CPU/Bus interface pins of the S1D13705 are connected to the header strips H1
and H2 for easy interface to a CPU/Bus other than ISA.
Refer to Table 4-1: “CPU/BUS Connector (H1) Pinout,” on page 11 and Table 4-2:
“CPU/BUS Connector (H2) Pinout,” on page 12 for specific settings.
Note
These headers only provide the CPU/bus interface signals from the S1D13705. When
another host bus interface is selected by CNF[3:0] and BS#, appropriate external decod-
ing logic MUST be used to access the S1D13705. Refer to Table 5-1: “Host Bus Inter-
face Pin Mapping,” on page 13 for connection details.