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 (Iout=25mA) a power supply has been provided as an integral part of t hi s 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 requ i rements and set the potentiometer accordi ngly
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 (Iout=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 requ i rements and set the potentiometer accordi ngly
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.