Atmel AT91EB01, User Manual

Page: 41 / 44

Appendix B - Schematics
AT91EB01 Evaluation Board User Manual 7-7
Figure 6. Power, Crystal Oscillator and Clock Distribution
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
A
A
B
B
C
C
D
D
Insert jumper in one position only
V
o
lt
age i
nput ra
nge :
7
.5
to 9V
, 0.5A
Note : P
o
wer supply is inp
u
t
protected
to
3
0
V
h
o
w
e
v
e
r
re
g
u
la
to
r will tr
ip
o
u
t
if
it
gets
to
hot.
B
inary 4-bit
c
o
unter
V
o
lt
age Regu
la
to
r
O
u
tp
u
t
V
out =
1.25(1
+
(
R
b
/R
a
))
Ra Rb
Distibute test pins over board
POWER LED
Link
fi
e
ld
a
llo
w
s
s
e
le
c
ti
o
n
o
f
on board clock or divide b
y
2, 4 and 8, or extern
a
l
clock s
o
u
rc
e
c
onnected
v
ia
EBI
Note : Ground will be approx. 0.7V highe
r tha
n the
powe
r s
upply
gr
ound
Place as near as possible to AT91
S
ystem P
o
wer S
upply - V
DD (3V
3)
Place as near as possible to AT91
Place as near as possible to AT91
Place as near as possible to AT91
Make as short as possible
P
ri
n
t o
n
P
C
B
w
h
e
re
to
positi
on
ju
mper
for the v
a
ri
ou
s
cl
oc
k
frequencies
i.e.MA
S
T
, /
8
, /
4
, /
2
, E
B
I
Place
c
apacitors as close as possible
to
the connector.
P
ri
n
t o
n
PCB
Po
w
e
r
ARM EOI-0042 (OSCPOWER.SCH)
B
Power, Crystal oscillator and clock distribution
(c) ARM LTD. 90 F
u
lbourn Road
Cherry H
in
to
n
C
ambridge
CB1 4JN
B
68
Tuesday,
J
u
ly
1
4
,
1998
Titl
e
S
iz
e
Document Number
Rev
Date:
Sheet
of
AT91CLK
/2 /4 /8
VDD GND
VIN
EBI_MCKI VDD
GND
VDD VDD
VDD
VDD
GND
VDD
VDD
VDD
VDD
VDD
VDD
J4
2.1mm Power Socket
3 2 1
R19 10K
+
C29
10uF
(3
5V
)
+
C30 10u
R15 470R
U11 GXO-U10
8
32
.768MHz
3V3
1 2
3 4
EN GND
OUT VDD
GND
1
TESTPIN
1
GND
2
TESTPIN
1
GND
3
TESTPIN
1
R18 33R
U9 LT108
6C
M
3 2 1
IN
OUT
ADJ
R17 360R 1206 R16 220R 1206
GND
4
TESTPIN
1
LK2 CON10AP
1 3 5 7 9
2 4 6 8 10
+ + + + +
+ + + + +
C28
22nF(T)
2
1
3
C31 22nF(T)
2
1
3
C32 100n
C33 100n
D3 ES1B
2 1
D4 ES1B
2 1
D2 ES1B
2 1
D5 ES1B
2 1
U10 74LV161
3 4 5 6 7
10
2
9
1
14 13 12 11 15 16
8
D0 D1 D2 D3 CEP
CET
CLK
PE
MR
Q0 Q1 Q2 Q3 TC
VDD
GND
TP12 Test Point
1
TP
TP9 Test Point
1
TP
TP10 Test Point
1
TP
TP11 Test Point
1
TP
TP13
Test Point
1
TP
TP14
Test Point
1
TP
D6 LED-RED
2 1
AT91CLK
EBI_MCKI