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ST8012 Fiches technique(PDF) 9 Page - Sitronix Technology Co., Ltd.

No de pièce ST8012
Description  120 Output LCD Common/Segment driver IC
Download  47 Pages
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Fabricant  SITRONIX [Sitronix Technology Co., Ltd.]
Site Internet  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST8012 Fiches technique(HTML) 9 Page - Sitronix Technology Co., Ltd.

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ST8012
V1.6
9/47
2004/09/08
(Common mode)
SYMBOL
FUNCTION
VDD
Logic system power supply pin, connected to +2.5 to +5.5 V.
VSS
Ground pin, connected to 0 V.
V0, V1
V2, V3
V4
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 VDD, and must
maintain the relative magnitudes shown below.
V0 ≧V1 ≧V2 ≧V3 ≧V4 ≧Vss
When the power supply turns ON, the internal power supply circuits produce the V1 to V4 voltages
shown below. The voltage settings are selected using the LCD bias set command.
1/120 Duty
1/112 Duty
1/96Duty
1/80Duty
1/64Duty
1/48 Duty
1/30 Duty
V4
1/11*V0 ,1/9*V0
1/11*V0, 1/9*V0
1/10*V0, 1/8*V0
1/9*V0, 1/7*V0 1/9*V0, 1/7*V0 1/7*V0, 1/5*V0 1/6*V0, 1/5*V0
V3
2/11*V0,1/9*V0
2/11*V0, 2/9*V0
2/10*V0, 2/8*V0
2/9*V0, 2/7*V0 2/9*V0, 2/7*V0 2/7*V0, 2/5*V0 2/6*V0, 2/5*V0
V2
9/11*V0, 7/9*V0
9/11*V0, 7/9*V0
8/10*V0, 6/8*V0
7/9*V0, 5/7*V0 7/9*V0, 5/7*V0 5/7*V0, 3/5*V0 4/6*V0, 3/5*V0
V1
10/11*V0,8/9*V0
10/11*V0,8/9*V0
9/10*V0, 7/8*V0
8/9*V0, 6/7*V0 8/9*V0, 6/7*V0 6/7*V0, 4/5*V0 5/6*V0, 4/5*V0
LP
Shift clock pulse input pin for bi-directional shift register
* Data is shifted at the falling edge of the clock pulse.
XRST
System Reset pin .When low level active.
If not used the hardware reset, this pin must pull height.
The XRST L PULSE timing min value is 200us and max value is 0.5s
L/R
Input pin for selecting the shift direction of bi-directional shift register
Data is shifted from COMSEG119 to COMSEG0 when set to VSS level "L", and data is shifted from
COMSEG0 to COMSEG119 when set to VDD level "H".
Refer to "RELATIONSHIP BETWEEN THE DISPLAY DATA AND LCD DRIVE OUTPUT PINS" in
Functional Operations.
XDISPOFF
Control input pin for output of non-select level
The input signal is level-shifted from logic voltage level to LCD drive voltage level, and controls the
LCD drive circuit.
When set to VSS level "L", the LCD drive output pins (COMSEG0-COMSEGx) are set to level Vss.
When set to "L”, the contents of the shift register are reset to not reading data. When the /DISPOFF
function is canceled, the driver outputs non-select level (V1 or V4), and the shift data is read 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, the shift data is not read correctly.
Table of truth-values is shown in "TRUTH TABLE" in Functional Operations.
FR
AC signal input pin for LCD drive waveform
The input signal is level-shifted from logic voltage level to LCD drive voltage level, and controls the
LCD drive circuit.


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