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Itop4412 LCD backlight drive (PWM)

2022-04-23 07:08:00 【OneSea】

0 Preface

differ 《[Exynos4412][Tiny4412]LCD Backlight drive （WLED）》,iTOP4412 Of LCD Backlight brightness through PWM To adjust , This article is based on linux-3.0.15 analysis iTOP4412 Plastic shell 7 " LCD Backlight drive for .

notes ： Because mainly through PWM Realize brightness control , Therefore, this paper also involves PWM drive .

1 principle

analysis iTOP4412 The schematic shows that LCD Backlight PWM The control pins are as follows ：

chart 1.1[1]P2

because Exynos4412 GPD0 Output PWM The level is 1.8V Of , Need to pass through 74ALVC1642

版权声明
本文为[OneSea]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204230606153702.html

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