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ST8024S Fiches technique(PDF) 6 Page - Sitronix Technology Co., Ltd.

No de pièce ST8024S
Description  COM/SEG LCD Driver
Download  27 Pages
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Fabricant  SITRONIX [Sitronix Technology Co., Ltd.]
Site Internet  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST8024S Fiches technique(HTML) 6 Page - Sitronix Technology Co., Ltd.

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ST8024S
Ver 0.39
Page 6/27
2008/05/05
6.
FUNCTIONAL DESCRIPTION
6.1
Pin Functions
(Segment mode)
SYMBOL
FUNCTION
VDD
Logic system power supply pin,
Ÿ
Connected to +2.5 to +5.5 V.
GND
Ground pin
LGND
Logic ground pin
Ÿ
Do not short LGND with GND and Vss by ITO on LCD panel
Ÿ
Connect it to GND on PCB or FPC.
VSS
Connect to GND by ITO on LCD panel.
V0L, V0R
V12L, V12R
V43L, V43R
Bias power supply pins for LCD drive voltage
Ÿ
Normally use the bias voltages set by a resistor divider
Ÿ
Ensure that voltages are set such that VSS < V43 < V12 < V0.
Ÿ
ViL and ViR (i = 0,12, 43) must connect to an external power supply, and supply regular
voltage which is assigned by specification for each power pin
DI7-DI0
Input pins for display data
Ÿ
In 4-bit parallel mode, DI3-DI0 are the display data input pins, and DI7-DI4 must be
connected to LGND or VDD.
Ÿ
In 8-bit parallel mode, All DI7-Dl0 pins are the display data input pins.
Ÿ
Refer to section 6.2.2.
XCK
Clock input pin for taking display data
Ÿ
Data is read at the falling edge of the clock pulse.
LP
Latch pulse input pin for display data
Ÿ
Data is latched at the falling edge of the clock pulse.
L/R
Input pin for selecting the reading direction of display data
Ÿ
When set to LGND level "L", data is read sequentially from Y240 to Y1.
Ÿ
When set to VDD level "H", data is read sequentially from Y1 to Y240.
Refer to section 6.2.2.
/DISPOFF
Control input pin for output of non-select level
Ÿ
The input signal is level-shifted from logic voltage level to LCD drive voltage level, and
controls the LCD drive circuit.
Ÿ
When set to LGND level "L", the LCD drive output pins (Y1-Y240) are set to level Vss.
Ÿ
When set to "L", the contents of the line latch are reset, but the display data are read in
the
data latch regardless of the condition of /DISPOFF. When the /DISPOFF function is
canceled, the driver outputs non-select level (V12 or V43), then outputs the contents of
the data latch at the next falling edge of the LP. At that time, if /DISPOFF removal time
does not correspond to what is shown in AC characteristics, it can not output the
reading data correctly.
Ÿ
Table of truth values is shown in "TRUTH TABLE" in Functional Operations.
FR
AC signal input pin for LCD drive waveform
Ÿ
The input signal is level-shifted from logic voltage level to LCD drive voltage level, and
controls the LCD drive circuit.
Ÿ
Normally it inputs a frame inversion signal.
Ÿ
The LCD drive output pins' output voltage levels can be set using the line latch output
signal and the FR signal.
Ÿ
Table of truth values is shown in "TRUTH TABLE" in Functional Operations.
MD
Mode selection pin
Ÿ
When set to LGND level "L", 8-bit parallel input mode is set.
Ÿ
When set to VDD level "H", 4-bit parallel input mode is set.
Ÿ
Refer to section 6.2.2.
S/C
Segment mode/common mode selection pin
Ÿ
When set to VDD level "H", segment mode is set.
ElO1, EIO2
Input/output pins for chip selection
Ÿ
When L/R input is at LGND level "L", ElO1 is set for output, and EIO2 is set for input.
Ÿ
When L/R input is at VDD level "H", ElO1 is set for input, and EIO2 is set for output.
Ÿ
During output, set to "H" while LP • XCK is "H" and after 240 bits of data have been


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