Microchip Technology ATSAMA5D2-ICP User Manual page 17

Figure 3-9. Reset Circuitry
R209
RTCKIN
DNP
0603
R208
10k
GND
NRST
DIS_BOOT
NSTART
PD0
PIOBU1
3.2.3.2 Power Backup Supply
The SAMA5D2-ICP board requires a power source in order to permanently power the backup part of the SAMA5D27
device (refer to the SAMA5D2 Series data sheet). A super capacitor sustains such permanent power to VDDBU
when all system power sources are off.
Figure 3-10. VDDBU Powering Option
3V3
3.2.4 Push Button Switches
The SAMA5D2-ICP features five push buttons:
• One reset push button (SW1). When pressed and released, it causes a general reset of the board
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2020 Microchip Technology Inc.
3V3
3V3 R211 R212
100k 100k
J18
0402 0402
0R
R210
100R
0402
FTSH-105-01-F-DV-K
GND
SW1
1
R250
100R 2
1% 0402
TACT SPST
SW2
1
R251
100R 2
1% 0402
TACT SPST
SW3
1
R252
100R 2
1% 0402
TACT SPST
SW4
1
R254
100R 2
1% 0402
TACT SPST
SW5
1
R255
0R 2
0603
TACT SPST
D1
R3
100R
5% 0805
RB160M-60TR
R213
100k
0402
CON_JTAG_TMS
CON_JTAG_TCK
CON_JTAG_TDO
CON_JTAG_TDI
PB18
NRST
NRST
NRST
WAKE_UP
4
3
4
U27
3
4
PA3
PA4
3
4
3
4
3
GND
D2
1
3
2
BAT54C
C5
C7
220mF
0.1uF
3.3V
16V
P4.6D4.8H1.66
0402
GND GND
User Guide
NSTART
ATSAMA5D2-ICP
Board Components
PD0
PIOBU1
3V3 VDDBU
R1 R2 R256
10k 10k 10k
nINTO
nRSTO
nSTRTO
VDD_3V3_JLINK
TRESIN
R215
150R 3
TRESOUT
A
4
B0
R216
1k
GND
J2
HDR-2.54 Male 1x2
2 1
VDDBU
JP2
Shunt 2.54mm 1x2
DS60001592A-page 17
SW3
1
R252
100R 2
1% 0402
TACT SPST
SW4
1
R254
100R 2
1% 0402
TACT SPST
SW5
1
R255
0R 2
0603
TACT SPST
U2
C273
0.1uF
0402 16V
U28 GND
6
PA26_3U
S
2
NRST
B1
NLAS3157MX3TC