ATSAM3U datasheet(5/62 Pages) ATMEL

5 / 62 page

6430CS–ATARM–09-Apr-10

SAM3U Series

Signal Description

Table 3-1 gives details on the signal names classified by peripheral.

Table 3-1.

Signal Description List

Signal Name

Function

Type

Active

Level

Voltage

Reference

Comments

Power Supplies

VDDIO

Peripherals I/O Lines Power Supply

Power

1.62V to 3.6V

VDDIN

Voltage Regulator Input

Power

1.8V to 3.6V

VDDOUT

Voltage Regulator Output

Power

1.8V

VDDUTMII

USB UTMI+ Interface Power Supply

Power

3.0V to 3.6V

GNDUTMII

USB UTMI+ Interface Ground

Ground

VDDBU

Backup I/O Lines Power Supply

Power

1.62V to 3.6V

GNDBU

Backup Ground

Ground

VDDPLL

PLL A, UPLL and OSC 3-20 MHz Power Supply

Power

1.62 V to 1.95V

GNDPLL

PLL A, UPLL and OSC 3-20 MHz Ground

Ground

VDDANA

ADC Analog Power Supply

Power

2.0V to 3.6V

GNDANA

ADC Analog Ground

Ground

VDDCORE

Core, Memories and Peripherals Chip Power

Supply

Power

1.62V to 1.95V

GND

Ground

Clocks, Oscillators and PLLs

XIN

Main Oscillator Input

Input

VDDPLL

XOUT

Main Oscillator Output

Output

XIN32

Slow Clock Oscillator Input

Input

VDDBU

XOUT32

Slow Clock Oscillator Output

Output

VBG

Bias Voltage Reference

Analog

PCK0 - PCK2

Programmable Clock Output

Output

VDDIO

Shutdown, Wakeup Logic

SHDN

Shut-Down Control

Output

VDDBU

push/pull

0: The device is in

backup mode

1: The device is running

(not in backup mode)

FWUP

Force Wake-Up Input

Input

Low

Needs external pull-up

Serial Wire/JTAG Debug Port (SWJ-DP)

TCK/SWCLK

Test Clock/Serial Wire Clock

Input

VDDIO

No pull-up resistor

TDI

Test Data In

Input

No pull-up resistor

TDO/TRACESWO

Test Data Out/Trace Asynchronous Data Out

Output

TMS/SWDIO

Test Mode Select/Serial Wire Input/Output

Input

No pull-up resistor

JTAGSEL

JTAG Selection

Input

High

VDDBU

Internal permanent

pull-down

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