Abstract
This chapter covers some miscellaneous hardware topics that are important to embedded systems, such as power-on resets, switch de-bouncing, power management, managing displays, and using touchscreens.
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Notes
- 1.
In CMOS circuit, there are parasite BJTs formed by p well, n well, and the substrate. When these parasite BJTs are turned on by ESD or incorrect power-on sequence, a short circuit will be created. The creation of such short circuit is called latch-up. IC designers would usually put guard rings to prevent latch-up, but only to some extent.
- 2.
As a trade-off between brightness, contrast, and dim environment, some LCDs called transflective display use both reflection and backlighting. Under sunlight, the backlight can be turned off, but it can be turned back on when the environment is dim. In this way, a transflective LCD can be viewed in both direct sunlight and lowlighting conditions.
- 3.
- 4.
Note that TN and STN are merely referring to the liquid crystal cell structure while the passive or active matrixes mainly refer to the way how electrical fields are applied and kept. For STN, it is commonly used on passive matrix. But for TN, there are also TN-active-matrix LCDs being manufactured.
- 5.
I’m not sure if there is an industry standard on those tech terms. But my impression is that LCD modules are often more advanced than LCD panels.
- 6.
This is not always true, as sensors can also be integrated into the LCD display, such as is the case with the in-cell technology.
- 7.
This is not always true, though. With some extra effort, certain gestures can be recognized as well on resistive touch screens, as exemplified in Ref [24].
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© 2016 Changyi Gu
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Gu, C. (2016). De-Bounce, Power Management, and Display. In: Building Embedded Systems. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-1919-5_11
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DOI: https://doi.org/10.1007/978-1-4842-1919-5_11
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