Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos
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ATSAM4S-XPLD
21
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
For ADC, VDDIN needs to be greater than 2.0V.
For DAC, VDDIN needs to be greater than 2.4V.
For DAC, VDDIN needs to be greater than 2.4V.
Figure 5-2.
Core Externally Supplied
Note:
Restrictions
For USB, VDDIO needs to be greater than 3.0V.
For ADC, VDDIN needs to be greater than 2.0V.
For DAC, VDDIN needs to be greater than 2.4V.
For USB, VDDIO needs to be greater than 3.0V.
For ADC, VDDIN needs to be greater than 2.0V.
For DAC, VDDIN needs to be greater than 2.4V.
below provides an example of the powering scheme when using a backup battery. Since the PIO state is
preserved when in backup mode, any free PIO line can be used to switch off the external regulator by driving the PIO line
at low level (PIO is input, pull-up enabled after backup reset). External wake-up of the system can be from a push button
or any signal. See
at low level (PIO is input, pull-up enabled after backup reset). External wake-up of the system can be from a push button
or any signal. See
Figure 5-3.
Backup Battery
Main Supply
(1.62V-3.6V)
(1.62V-3.6V)
Can be the
same supply
same supply
VDDCORE Supply
(1.08V-1.32V)
(1.08V-1.32V)
ADC, DAC, Analog
Comparator Supply
(2.0V-3.6V)
Comparator Supply
(2.0V-3.6V)
ADC, DAC
Analog Comp.
USB
Transceivers.
VDDIN
Voltage
Regulator
VDDOUT
VDDCORE
VDDIO
VDDPLL
ADC, DAC
Analog Comp.
USB
Transceivers.
VDDIN
Voltage
Regulator
3.3V
LDO
LDO
Backup
Battery
Battery
+
-
ON/OFF
IN
OUT
VDDOUT
Main Supply
VDDCORE
ADC, DAC, Analog
Comparator Supply
(2.0V-3.6V)
Comparator Supply
(2.0V-3.6V)
VDDIO
VDDPLL
PIOx (Output)
WAKEUPx
External wakeup signal
Note: The two diodes provide a “switchover circuit” (for illustration purpose)
between the backup battery and the main supply when the system is put in
backup mode.
between the backup battery and the main supply when the system is put in
backup mode.