S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 193
S1D13505
Manufacturer Part Number
S1D13505
Description
LCD Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13505.pdf
(566 pages)
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Vancouver Design Center
6.1.2 LCD Power Disable
Programming Notes and Examples
Issue Date: 01/02/05
REG[1Ah] Power Save Configuration Register
Power Save
Status (RO)
n/a
Setting the LCD Enable bit to 0 causes the S1D13505 to disable the LCD display. The
following sequence of events occurs:
The LCD Power Disable bit is used to manually power-off the LCD bias power supply.
Setting the LCD Power Disable bit to 1 begins discharging the LCD bias power supply.
Setting the LCD Power Disable bit to 0 causes the LCD bias power supply to power-on.
If your situation requires using the LCD Power Disable bit, see Section 6.1.2, “LCD Power
Disable” on page 39 for the correct procedure. The LCD Enable bit (REG[0Dh] bit 0)
should be set to 1 to allow the S1D13505 to power-on the LCD using the automatic LCD
Power Sequencing.
If the LCD bias power supply timing requirements are different than those timings built into
the S1D13505 power disable sequence, it may be necessary to manually power-off an LCD
panel. One of two situations may be true:
• Delay is too short.
• Delay is too long.
Different procedures should be used for each situation. Choose the appropriate procedure
based on your requirements from the following:
Delay Too Short
To lengthen the 128 frame delay on LCDPWR.
1. Disables the LCD power.
2. Counts 128 frames to wait for the LCD bias power supply to discharge.
3. Disables the LCD signals.
1. Set REG[1Ah] bit 3 to 1 - disable LCD Power.
2. Count 'x' Vertical Non-Display Periods.
3. Set REG[0Dh] bit 0 to 0 - disable the LCD outputs.
'x' corresponds to the power supply discharge time converted to the equivalent vertical
non-display periods.
n/a
n/a
LCD Power
Disable
Suspend
Refresh
Select Bit 1
Suspend
Refresh
Select Bit 0
Software
Suspend
Mode Enable
X23A-G-003-07
S1D13505
Page 39
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