Atmel SMART SAM4C Series User Manual page 10

3.3.3 Reset and Wake-Up Circuitry
The reset sources for the EK board are:
Power-on reset

Push-button reset (refer to

JTAG reset from an in-circuit emulator

3.3.4 Power Supplies
The SAM4C32-EK board evaluation and development platform embeds all the necessary power rails required for
the SAM4C32 processor and peripherals.
The SAM4C32-EK board can be supplied by either a 5V DC block through input J2 (see
connection via J6 (refer to
A manual power supply selection switch (SW1) is provided to power on/off the main power line.
Figure 3-5. Power Supply Schematic
J2 J2
TWTJ-020-04P2
3.3.5 Power Rails
The SAM4C32 supports 1.6V–3.6V single supply mode (VDDIN). An internal regulator input is connected to the
source and its output feeds VDDCORE (VDDOUT connected to VDDCORE).
When the 3.3V supply is present, the Power LED D5 is lit. Test points TP2 to TP5 are used to perform testing.
Table 3-2. Power Supply Voltage Ranges
Power Supply
VDDIO
VDDBU
VDDIN
VDDLCD
VDDOUT
VDDPLL
VDDCORE
Section 3.11.2 "Push
"DBGU/USB Bridge Schematic" on page
D2 D2
1
2
NSR0320MW2T1G NSR0320MW2T1G
D3 D3
USB5V
NSR0320MW2T1G NSR0320MW2T1G
Ranges Comments
Flash Memory Charge Pumps Supply for Erase and Program Operations, and Read
operation
1.6V–3.6V
Input Output buffers Supply
Backup Area power supply. VDDBU is automatically disconnected when VDDIO is present
1.6V–3.6V
(> 1.9V)
1.6V–3.6V 1.6V min. if LCD and ADC not used, 2.5V otherwise
LCD Voltage Regulator Output
2.5V–3.6V External LCD power supply input (LCD regulator not used)
VDDIO/VDDIN need to be supplied when the LCD Controller is used
1.2V Output 120 mA Output Current
1.08V–1.32V –
1.08V–1.32V –
Buttons")
15).
U1 U1
ZEN056V130A24LS ZEN056V130A24LS
1
3
C29 C29
100nF
Atmel-11253A-ATARM-SAM4C32-EK-UserGuide_17-Sep-14
Figure
SW1 SW1
TP4 TP4
8SS1012-Z
1
2
3
C30 C30
10µF
R12 R12 1.5K
SAM4C32-EK [USER GUIDE]
3-5) or a USB
5V
C31 C31
10µF
10