Chapter 16
Appendix
XVI - 6 Cautions for Circuit Setup
16.1.4 Power Supply Circuit
■ Cautions for Setting Circuit with V
DD
The MOS logic such a microcontroller is high speed and high density; so, the power circuit should be designed,
taking into consideration of AC line noise, ripple caused by LED driver.
Figure: 16.1.7 shows an example for a circuit with VDD (Emitter follower type).
■ An Example for a Circuit with VDD (Emitter Follower Type)
Figure:16.1.7 An Example for a Circuit of VDD Supply (Emitter Follower Type)
V
SS
Microcontroller
V
DD
+
Set capacitors for noise-filter near
microcontroller power pins.
Noise-filter
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