Datasheet

16
32133D–11/2011
UC3D
Figure 4-1. Supply Decoupling
For decoupling recommendations for VDDIO, VDDANA and VDDCORE, please refer to the
Schematic checklist.
4.2.3 Regulator Connection
The UC3D supports two power supply configurations:
• 3.3V single supply mode
• 3.3V - 1.8V dual supply mode
4.2.3.1 3.3V Single Supply Mode
In 3.3V single supply mode the internal regulator is connected to the 3.3V source (VDDIN pin).
The regulator output (VDDOUT) needs to be externally connected to VDDCORE pin to supply
internal logic. Figure 4-2 shows the power schematics to be used for 3.3V single supply mode.
3.3V
1.8V
VDDIN
VDDOUT
1.8V
Regulator
C
IN1
C
OUT1
C
OUT2
C
IN2