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AN1048D датащи(PDF) 5 Page - STMicroelectronics

номер детали AN1048D
подробное описание детали  ST7 software LCD driver
PDF  21 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1048D датащи(HTML) 5 Page - STMicroelectronics

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AN1048
LCD drive signals
5/21
0 or VDD levels and to high impedance input mode for VDD/2. When one backplane is active,
the other one is neutralised by applying VDD/2 to it. This VDD/2 voltage is defined by two
resistors of equal value, externally connected to the I/O pin. By using an MCU with flexible
I/O pin configuration, a duplexed LCD drive can be implemented with only 2 external
resistors bridge (each on two com lines).
Figure 3.
Basic LCD Segment Connection in duplexed mode
Figure 4.
LCD signals for duplexed mode (used in the ST7 example)
COM1
COM2
S1
S11
S12
S2
S3
COM1
S11=COM1-S1
+Vdd
S12=COM2-S1
S1
+Vdd
+Vdd
COM2
CASE1
CASE2
CASE3
CASE4
+Vdd/2
+Vdd/2
-Vdd
+Vdd
+Vdd/2
-Vdd/2
-Vdd
+Vdd
+Vdd/2
-Vdd/2
SEGMENT1
SEGMENT2
OFF
ON
ON
OFF
OFF
OFF
ON
ON



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