sam4s8c ATMEL Corporation, sam4s8c Datasheet - Page 18

• Manufacturer Part Number: sam4s8c
• Description: At91sam Arm-based Flash Mcu
• Manufacturer: ATMEL Corporation

18
Figure 5-1.
Note:
Figure 5-2.
Note:
Figure 5-3
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”
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.
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.
below provides an example of the powering scheme when using a backup battery.
Single Supply
Core Externally Supplied
ADC, DAC, Analog
Comparator Supply
(2.0V-3.6V)
VDDCORE Supply
(1.08V-1.32V)
Main Supply
(1.62V-3.6V)
Main Supply
(1.8V-3.6V)
Can be the
same supply
for further details.
VDDIO
VDDIN
VDDOUT
VDDCORE
VDDPLL
VDDIO
VDDIN
VDDOUT
VDDCORE
VDDPLL
Analog Comp.
Transceivers.
ADC, DAC
Regulator
Voltage
Analog Comp.
Transceivers.
USB
Regulator
ADC, DAC
Voltage
USB
11100AS–ATARM–27-Oct-11