![](http://datasheet.mmic.net.cn/Atmel/ATSAM3X8EA-CU_datasheet_96581/ATSAM3X8EA-CU_7.png)
9
11057BS–ATARM–13-Jul-12
SAM3X/A
9
11057BS–ATARM–13-Jul-12
SAM3X/A
3.
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
VDDUTMI
USB UTMI+ Interface Power Supply
Power
3.0V to 3.6V
VDDOUT
Voltage Regulator Output
Power
VDDIN
Voltage Regulator, ADC and DAC Power
Supply
Power
GNDUTMI
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 Oscillator Power Supply
Power
1.62 V to 1.95V
GNDPLL
PLL A, UPLL and Oscillator Ground
Ground
VDDANA
ADC and DAC Analog Power Supply
Power
2.0V to 3.6V
GNDANA
ADC and DAC Analog Ground
Ground
VDDCORE
Core 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
Shutdown, Wakeup Logic
SHDN
Shut-Down Control
Output
VDDBU
0: The device is in
backup mode
1: The device is
running (not in
backup mode)
FWUP
Force Wake-up Input
Input
VDDBU
Needs external Pull-
up