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AN2687 Datasheet(PDF) 2 Page - STMicroelectronics

No. de pieza AN2687
Descripción Electrónicos  STM8S20xxx LCD software driver
Download  22 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2687 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2687
2/22
Doc ID 14296 Rev 1
Contents
1
LCD principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
LCD drive signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
Quadruplex LCD drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1
LCD mean voltage calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.2
Contrast calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3
Example of a quadruplex LCD driver with STM8 . . . . . . . . . . . . . . . . . 10
3.1
First method: Timer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2
Second method: Auto-wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Consumption considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5
Software contrast control with the first method . . . . . . . . . . . . . . . . . 17
5.1
Contrast calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6
LCD demo board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1
Board information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21


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