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ST8011 Fiches technique(PDF) 8 Page - Sitronix Technology Co., Ltd.

No de pièce ST8011
Description  120 Output LCD Segment driver IC
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Fabricant  SITRONIX [Sitronix Technology Co., Ltd.]
Site Internet  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

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ST8011
V1.3
8/20
2004/09/08
n
FUNCTIONAL DESCRIPTION
u
Pin Functions
SYMBOL
FUNCTION
VDD
Logic system power supply pin, connected to +2.5 to +5.5 V.
VSS
Ground pin, connected to 0 V.
V0 V2 V3
This is a multi-level power supply for the liquid crystal drive. The voltage Supply applied is
determined by the liquid crystal cell, and is changed through the use of a resistive voltage divided or
through changing the impedance using an op. amp. Voltage levels are determined based on VSS,
and must maintain the relative magnitudes shown below.
Ÿ
V0
V2
V3 Vss
≧≧
DI3-DI0
Input pins for display data
Ÿ
In 4-bit parallel input mode, input data into the 4 pins, DI3-DI0.
Ÿ
In serial input mode, input data into the 1 pin DI0.
Connect DI3-DI1 to VSS or VDD
Ÿ
Refer to "RELATIONSHIP BETWEEN THE DISPLAY DATA AND LCD DRIVE OUTPUT
PINS" in Functional Operations.
XCK
Clock input pin for taking display data
* 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.
XDISPOFF
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 VSS level "L", the LCD drive output pins (SEG0-SEG119) 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 XDISPOFF function is canceled,
the driver outputs non-select level (V2 or V3), then outputs the contents of the data latch at the
next falling edge of the LP. At that time, if XDISPOFF removal time does not correspond to what is
shown in AC characteristics, it cannot 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.
P/S
Interface Mode selection pin
Ÿ
When P/S is “H” then parallel data input mode.


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