20
20-2
POWER SUPPLY CIRCUIT
32180 Group User's Manual (Rev.1.0)
20.1 Configuration of the Power Supply Circuit
The 32180 operates with a single 5 V ± 0.5 V or 3.3 V ± 0.3 V power supply.
Unless otherwise noted, 5 V ± 0.5 V and 3.3 V ± 0.3 V in this chapter are referred to simply by 5 V and 3.3 V,
respectively.
Table 20.1.1 Power Supply Functions
Power Supply Type Pin Name Function
5.0V or 3.3V VCCE Main power supply
AVCC0, AVCC1 Power supply for the A-D converter
VREF0, VREF1 Reference voltage for the A-D converter
VCC-BUS Power supply for the external bus
OSC-VCC Power supply for the oscillator circuit
VDDE Power supply for the internal RAM backup
Figure 20.1.1 Configuration of the Power Supply Circuit (VCCE = 5.0 V or 3.3 V)
20.1 Configuration of the Power Supply Circuit
VCCE
32180
OSC-VCC
AVCC
VCC-BUS
VDDE
EXCVDD
VDC
Note 1: Make sure this voltage is the same as VCCE.
EXCVCC
1–10 µF
I/O Control Circuit
CPU
Peripheral Circuit
Flash Memory
PLL
Oscillator Circuit
A-D Converter Circuit
External Bus
RAM
Internal Voltage Generator Circuit
Main VDC
Backup Voltage Generator Circuit
Sub-VDC
1–10 µF
(Note 1)
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