Datasheet

15
11090BS–ATARM–22-Oct-13
SAM3S8/SD8 Summary
Figure 5-1. Single Supply
Note: Restrictions
With Main Supply < 2.0 V, USB and ADC/DAC and Analog comparator are not usable.
With Main Supply ≥ 2.0V and < 3V, USB is not usable.
With Main Supply ≥ 3V, all peripherals are usable.
Figure 5-2. Core Externally Supplied
Note: Restrictions
With Main Supply < 2.0V, USB is not usable.
With VDDIN < 2.0V, ADC, DAC and Analog comparator are not usable.
With Main Supply ≥ 2.0V and < 3V, USB is not usable.
With Main Supply and VDDIN ≥ 3V, all peripherals are usable.
Figure 5-3 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
Section 5.6 “Wake-up Sources” for further details.
Main Supply
(1.8V-3.6V)
ADC, DAC
Analog Comp.
USB
Transceivers.
VDDIN
Voltage
Regulator
VDDOUT
VDDCORE
VDDIO
VDDPLL
Main Supply
(1.62V-3.6V)
Can be the
same supply
VDDCORE Supply
(1.62V-1.95V)
ADC, DAC, Analog
Comparator Supply
(2.0V-3.6V)
ADC, DAC
Analog Comp.
USB
Transceivers.
VDDIN
Voltage
Regulator
VDDOUT
VDDCORE
VDDIO
VDDPLL