Datasheet

32142D–06/2013

ATUC64/128/256L3/4U

6.1.3.1 3.3V Single Supply Mode

In 3.3V single supply mode the internal regulator is connected to the 3.3V source (VDDIN pin)

and its output feeds VDDCORE. Figure 6-2 shows the power schematics to be used for 3.3V

single supply mode. All I/O lines will be powered by the same power (VDDIN=VDDIO).

Figure 6-2. 3.3V Single Supply Mode

VDDIO

VDDCORE

1.98-3.6V

VDDANA

ADC

VDDIN

GND

GNDANA

CPU,

Peripherals,

Memories,

SCIF, BOD,

RCSYS,

DFLL, PLL

OSC32K,

RC32K,

POR33,

SM33

I/O Pins

OSC32K_2,

AST, Wake,

Regulator

control

Linear

regulator