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12
ATSAM4C-EK [USER GUIDE]
11251A–ATARM–16-Dec-13
3.4
Embedded Memories
I2C for data storage in EEPROM (Atmel AT24C1024B)
SPI Serial Flash AT45 or AT25F
3.4.1
TWI EEPROM
The AT24C1024B provides 1,048,576 bits of serial electrically erasable and programmable read-only memory
(EEPROM) organized as 131,072 words of 8 bits each.
Device slave address byte: 0x50.
Figure 3-8.
TWI EEPROM Schematic
3.4.2
SPI Serial Flash
The ATSAM4C-EK embeds one serial Flash device AT25DFxx or AT45DBxx connected through the SPI. (The
AT25DF321A is mounted by default.)
Figure 3-9.
SPI Serial Flash Schematic
ADDR: 0X50
(SCL)
(SDA)
PA25
PA24
VDDMAIN
VDDMAIN
VDDMAIN
C62
100nF
R45
0R
R42
4.7K
R41
4.7K
R46
0R
R40
0R/DNP
U4
AT24C1024B
A0
1
A1
2
A3
3
GND
4
SDA
5
SCL
6
WP
7
VCC
8
R39
0R/DNP
Do Not Populate
U13 and U10 PCB footprints
differ by 90 degrees and are stacked.
R100 to R103 should be close to SAM4C.
SPI0_MISOC
SPI0_NPCSC
PA7
SPI0_MOSIC
PA6
SPI0_MISOC
PA8
SPI0_SPCKC
SPI0_MOSIC
SPI0_SPCKC
SPI0_NPCSC
PA5
VDDIN
VDDIN
VDDIN
VDDIN
R105
470K
R103
0R
U13
AT45DB321D DNP
SI
1
SCK
2
/RESET
3
/CS
4
/WP
5
VCC
6
GND
7
SO
8
R101
33R
R102
33R
C80
100nF
U10
AT25DF321A-SH-B
/CS
1
SO
2
/WP
3
GND
4
SI
5
SCK
6
/HOLD
7
VCC
8
R100
33R
Do Not Populate
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