Epson Research and Development

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Vancouver Design Center

 

 

 

2.1.4 CRT Support

The S1D13504 has all the necessary signals to interface to an external RAMDAC so a CRT is supported. The Brooktree Bt481A RAMDAC is supported on the S5U13504-D9000 evaluation board.

Refer to the Programming Notes and Examples, document number X19A-G-002-xx for programming details.

2.1.5 Adjustable LCD BIAS Power Supply

Most color 640x480 passive LCD panels require a positive power supply to provide between +23V and +40V (Iout = 45mA). For ease of implementation, such a power supply has been provided as an integral part of this design. The signal VDDH can be adjusted by R16 to provide an output voltage from +23V to +40V and is enabled / disabled by the S1D13504 control signal LCDPWR.

LCDPWR is an output signal which follows a pre-defined power-up / power-down sequence designed to protect the LCD panel from damage caused by the power supply being enabled in the absence of control signals. Determine the panel’s specific power requirements and set the potenti- ometer accordingly before connecting the panel.

Evaluation Board User Manual

S5U13504-D9000

Issue Date: 01/02/02

X19A-G-003-05

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Epson S1D13504 manual CRT Support, Adjustable LCD Bias Power Supply