
7534 Group
Rev.3.00 Oct 23, 2006 page 49 of 53
REJ03B0099-0300
Fig. 53 Handling of VCC, USBVREFOUT pins of M37534M4-XXXFP, M37534E8FP
Description supplement for use of USB function stably
O
u
t
l
i
n
e
P
R
S
P
0
0
3
6
G
A
-
A
1
1
2
3
4
6
7
8
9
1
1
1
1
1
1
5
1
1
1
3
3
3
3
31
3
2
2
2
2
2
21
2
1
3
2
2
2
P00
C
N
VS
S
XO
U
T
XIN
VSS
P01
P02
P03
P04
P30(LED0)
V
c
c
V
R
E
F
P05
P10/RXD/D-
P
2
6/
A
N6
P27/AN7
P11/TXD/D+
P
1
2/
SC
L
P
13/
SD
A
T
P
23/
A
N3
P
22/
A
N2
P
21/
A
N1
P
20/
A
N0
P31(LED1)
P3
7/INT0
P24/AN4
P25/AN5
P06
P07
USBVREFOUT
RESET
M
3
7
5
3
4
M
4
-
X
X
X
F
P
M
3
7
5
3
4
E
8
F
P
P
14/
C
N
T
R0
P35(LED5)
P3
4(LED4)
P3
3(LED3)
P3
2(LED2)
1
.
5
kΩ
Reason of ➀ is to reduce the effect by switcing noise of microcomputer to the
analog circuit generating USBV
REFOUT
output. Use the bigger capacitor and
connect to device at the shortest distance.
Reason of ➁ is to prevent the instability of the USBV
REFOUT
output due to
external noise.
Connect a capacitor to a device as
close as possible. For the capacitor,
a ceramic capacitor or an electrolytic
capacitor of 0.22 µF is recommended.
➁
Connect a bypass capacitor to a device
as close as possible. For the capacitor,
a ceramic capacitor or an electrolytic
capacitor of 1.0 µF is recommended.
➀
Commentaires sur ces manuels