Atmel SMART SAM4C Series User Manual page 11

Figure 3-6. Power Rails Schematic
Note: Test points and jumpers are provided for easy access to each of the regulated power lines and measure the current on
each line.
3.3.6 Battery Backup
The VDDBU pin is powered from the 3.3V rail or from a backup battery BT1 via a dual Schottky diode D4.
Test points TP8 and jumper JP8/JP10 are used to perform voltage and current measurements.
Figure 3-7. Backup Battery Schematic
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.
11 SAM4C32-EK [USER GUIDE]
Atmel-11253A-ATARM-SAM4C32-EK-UserGuide_17-Sep-14
5V
R14 R14
Ω
100K
6 5 4
Q1 Q1
JP9 JP9
Si1563EDH Si1563EDH
C36 C36
100nF
FORCE
POWER
1 2 3
C43 C43 FORCE_ON
ON
R19 R19
15pF
Ω
10K
Ω
R20 R20 10K
{3} SHDN
TP5 TP5
VDDOUT
JP6 JP6
TP6 TP6
L2 L2
JP7 JP7
56µH
R13 R13
C33 C33
C32 C32 2.2R .
2.2µF/DNP 100nF 100nF
Do Not Populate C34 C34
22µF 22
close to SAM4C32
VDDBU
JP8
TP8
C40
2.2µF
3V3
R15 R15
100K Ω
100
FORCE_ON
U2 RT9018A U2 RT9018A
1
5V
PGOOD GND
2
EN ADJ
3
VIN VOUT
4
VDD NC
C38 C38
C37 C37 1µF
10µF
C44 C44
V = 0.8 x (1 + R /R
1µF out top bottom
3V3 POWER
VDDCORE
3V3
VDDPLL
D4 D4 VDDIN
BAT54C BAT54C
1
3
2
JP10
VBATT
VDDBU
TP7
3V3
C35 C35
10nF
8
47K Ω 1%
R16
7
R17
6
470Ω
5
D5
R18
C41
15 15K Ω 1%
C39
1µF
10µF
RED RED
Power LED
)
TP10 TP10
VDDMAIN
JP11 JP11
TP11 TP11 VDDIN
JP12 JP12
TP12 TP12 VDDIO
JP13 JP13
BT1
C42
100nF