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Chapter 1 Overview
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Precautions
1-6-4 Power Supply Circuit
Cautions for Setting Power Supply Circuit
The CMOS logic microcontroller is high speed and high density. So, the power circuit should be de-
signed, taking into consideration of AC line noise, ripple caused by LED driver. Figure 1-6-6 shows an
example for emitter follower type power supply circuit.
Figure 1-6-6 An Example for Emitter follower type Power Supply Circuit
VSS
Microcontroller
V
DD
+
Set condensors for noise-filter near
microcontroller power pins.
For Noise-filter
LED port
LED
An example for Emitter Follower Type Power Supply Circuit