Adjustable Lcd Panel Negative Power Supply (Vlcd); Passive/Active Lcd Panel Support; Power Save Modes - Epson S5U13705B00C User Manual

S1d13705 embedded memory lcd controller

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Technical Description

6.5 Adjustable LCD Panel Negative Power Supply (VLCD)

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 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 LCDPWR control signal of S1D13705 and

inverted externally.

Determine the panel's specific power requirements and set the potentiometer accordingly

before connecting the panel.

The S1D13705 directly supports:

• 4/8-bit, single and dual, monochrome passive panels.

• 4/8-bit, single and dual, color passive panels.

• 9/12-bit, TFT active matrix panels.

All the necessary signals are provided on the 40-pin LCD connector J5. For connection

information, refer to Table 5-1: "LCD Signal Connector (J5)" on page 16.

The buffered LCD connector (J5) provides the same LCD panel signals as those directly

from S1D13705, but with voltage-adapting buffers selectable to 3.3V or 5.0V. Pin 32 on

this connector provides a voltage level of 3.3V or 5.0V to the LCD panel logic (see "JP6 -

LCDPWR Polarity" on page 12 for information on setting the panel voltage).

The S1D13705 supports one hardware and one software power save mode. The hardware

power save mode needs to be enabled by setting REG[02h] bit1 to 1 and then can be

activated by DIP switch SW1-6. See Table 3-1: "Configuration DIP Switch Settings" on

page 8.

Seiko Epson Corporation

S5U13705B00C Rev 2.0 PCI Evaluation Board

Rev. 3.1

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