Appendix B – Schematics
AT91EB42 Evaluation Board User Guide 6-11Figure 6-10. SPI Memories, I2C 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
2A0
1
GND 10
VCC 20
NC
3
NC
4
NC
5
NC
6
NC
7
NC
8
NC
9NC 13
NC 14
NC 15
NC 16
NC 17
NC 18
WP 19
C70
100nF
U18
AT45DB321-TC
RDY/BUSY
1
WP
3RESET
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
2SI
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
C89100nF
C90
100nF
U20
AD7817ARU
CONVST
1
BUSY
2
OTI
3
CS
4
AGND
5
REFin
6
Vin1
7
Vin2
8Vin3 9
Vin4 10
VDD 11
DGND 12
Dout 13
Din 14
SCLK 15
RD / WR 16
C104
10µF / 16V

+

R67750R / 1% R681K50 1%
R69750R / 1% R704K30 / 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]