Chapter 15
Regulator
XV - 2 Overview
15.1 Overview
The regulator converts 5 V VDD which is supplied externally and supplies it into the internal circuit of the
microcontroller.
15.1.1 Setup
Insert a capacitor which is more than 10 µF between each VDD pin and VSS. And insert a capacitor which is
more then 1 µF between each VDD2 and VSS. And insert a capacitor which is more then 2 µF between VDD3
and VSS. A capacitor should be near each pin.
It is recommended that total capacitance between all of the VDD and VSS is more than 10-times sum of capaci-
tance between all of the VDD2 and VSS plus capacitance etween VDD3 and VSS.
Figure:15.1.1 Setting Regulator
15.1.2 Operation
The regulator operates by application of power.
..
Use the regulator output as power supply only for the microcontroller.
..
V
DD×4
V
DD2×2
V
SS
Regulator
To internal circuit
10 µF×4
1 µF×2
V
DD3
2 µF
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