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Appendix B – Schematics
AT91EB42 Evaluation Board User Guide 6-11
Figure 6-10. SPI Memories, I
2
C Memories and SPI ADC
VCC3V3VCC3V3
VCC3V3
VCC3V3
VCC3V3
VCC3V3
VCC3V3
VCC3V3
VCC3V3
VCC3V3
VCC3V3
Vbatt+
Vps
VCC3V3
VCC3V3
VCC3V3
VCC3V3
Data Flash Memory
Serial EEPROM memory on PIO
Serial EEPROM memory on SPIA
A/D converter on SPIA
SCL1SCL
NPCSA0
MOSIA
MISOA
SPCKA
MOSIA
MISOA
SPCKA
NRST
SDA1
SDA
NPCSA1_1
NPCSA2_1
NCONVST
BUSY
NPB20
NPB20
NPCSA2_1
RD/WR
SPCKA
MOSIA
MISOA
RD/WR
VIN4
VIN3VIN2
VIN1
PB20_1
R31
100k
C65
100nF
U19
AT24C512W1-10SC-2.7
SCL
12
SDA
11
A1
2
A0
1
GND
10
VCC
20
NC
3
NC
4
NC
5
NC
6
NC
7
NC
8
NC
9
NC
13
NC
14
NC
15
NC
16
NC
17
NC
18
WP
19
C70
100nF
U18
AT45DB321-TC
RDY/BUSY
1
WP
3
RESET
2
SCK
14
SI
15
SO
16
CS
13
NC
4
NC
5
NC
6
NC
9
NC
10
NC
11
NC
12
NC
17
NC
18
NC
19
NC
20
NC
21
NC
22
NC
23
NC
24
NC
25
NC
26
NC
27
NC
28
NC
29
NC
30
NC
31
NC
32
GND
8
VCC
7
U21
AT25256W-10SC-2.7
CS
1
WP
3
SO
2
SI
5
SCK
6
HOLD
7
GND
4
VCC
8
C67
100nF
CB13
1 2
CB14
1 2
R40
100k
R34
100k
R32
100k
CB15
1 2
R66
100k
CB17
1 2
CB4
1 2
R65
100k
CB2
1 2
CB3
1 2
C89
100nF
C90
100nF
U20
AD7817ARU
CONVST
1
BUSY
2
OTI
3
CS
4
AGND
5
REFin
6
Vin1
7
Vin2
8
Vin3
9
Vin4
10
VDD
11
DGND
12
Dout
13
Din
14
SCLK
15
RD / WR
16
C104
10µF / 16V
+
R67
750R / 1%
R68
1K50 1%
R69
750R / 1%
R70
4K30 / 1%
CB7
12
R64
100k
R63
100k
CB6
12
CB8
12
CB18
1 2
R71
100k
C7
10pF
CB5
12
R51
100K
R52
100K
R53
100K
C6
10pF
U6C
74LVC02AD
1
8
9
10
U6D
74LVC02AD
1
11
12
13
7
14
PB17
PB16
NRST
MOSIA
SPCKA
NPCSA0
MISOA
NPCSA1
NPCSA2
PB19
IRQ3
PB20
VIN[1..4]