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AN3114 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN3114
Description  This application note describes techniques for connecting
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3114 Datasheet(HTML) 5 Page - STMicroelectronics

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AN3114
List of figures
Doc ID 16829 Rev 3
5/43
List of figures
Figure 1.
LCD principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.
Equivalent electrical schematic of a segment line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3.
LCD signals for direct drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 4.
Basic segment lines connection in duplex mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5.
LCD signals for duplex mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6.
Basic LCD segment lines connection in quadruplex mode. . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 7.
LCD signals in quadruplex mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8.
Basic LCD segment lines connection in octaplex mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9.
LCD signals in octaplex mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10.
Medium density LCD controller block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11.
Medium+ and high density LCD controller block diagram . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 12.
Resistive network (internal booster) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 13.
Layout for the PD-878. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 14.
LCD segments used on the STM8L1526-EVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 15.
Reference letters for an alphanumeric character on the PD-878 . . . . . . . . . . . . . . . . . . . . 24
Figure 16.
Layout for the custom LCD HXO5002B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 17.
Reference LCD segments for the custom LCD HXO5002B . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 18.
PD-878 physical connection for an alphanumeric character. . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 19.
PD-878 segment driver matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 20.
Letter “W” displayed on the PD-878 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 21.
Displaying “W” on the matrix for the PD-878 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 22.
HXO5002B LCD daughterboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 23.
HXO5002B segment driver matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 24.
Letter “A” displayed on the custom LCD HXO5002B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 25.
Displaying “A” on the matrix for the custom LCD HXO5002B. . . . . . . . . . . . . . . . . . . . . . . 36
Figure 26.
LCD segment drive firmware structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 27.
LCD segment drive software flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39



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