10
SAM4C32-EK [USER GUIDE]
Atmel-11253A-ATARM-SAM4C32-EK-UserGuide_17-Sep-14
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
“DBGU/USB Bridge Schematic” on page 15
).
A manual power supply selection switch (SW1) is provided to power on/off the main power line.
Figure 3-5.
Power Supply Schematic
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.
USB5V
U1
ZEN056V130A24LS
U1
ZEN056V130A24LS
1
2
3
J2
TWTJ-020-04P2
J2
1
2
3
D2
NSR0320MW2T1G
D2
NSR0320MW2T1G
D3
NSR0320MW2T1G
D3
NSR0320MW2T1G
5V
TP4
TP4
C29
100nF
C29
SW1
8SS1012-Z
SW1
3
1
2
R12
1.5K
R12
C31
C31
C30
10µF
C30
10µF
Table 3-2.
Power Supply Voltage Ranges
Power Supply
Ranges
Comments
VDDIO
1.6V–3.6V
Flash Memory Charge Pumps Supply for Erase and Program Operations, and Read
operation
Input Output buffers Supply
VDDBU
1.6V–3.6V
Backup Area power supply. VDDBU is automatically disconnected when VDDIO is present
(> 1.9V)
VDDIN
1.6V–3.6V
1.6V min. if LCD and ADC not used, 2.5V otherwise
VDDLCD
2.5V–3.6V
LCD Voltage Regulator Output
External LCD power supply input (LCD regulator not used)
VDDIO/VDDIN need to be supplied when the LCD Controller is used
VDDOUT
1.2V Output
120 mA Output Current
VDDPLL
1.08V–1.32V
–
VDDCORE
1.08V–1.32V
–
