Kontron COMe Starterkit Eval T2 Bedienungsanleitung Seite 126

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Seitenansicht 125
COM Express Interfaces
2.20.2. Reference Schematics
2.20.2.1. General Purpose Serial Port Example
Figure 49: General Purpose Serial Port Example
Figure 49: General Purpose Serial Port Example shows the schematic of two general purpose
serial ports with RS232 level shifter (U6). The transistor / inverter combination at the serial TX
and RX lines coming from the Module is necessary to handle the protection against VCC_12V
connection according to chapter 5.10 of COM.0 Rev. 2.1. The MAX3232CD is a dual port RS232
transceiver and handles the level shifting of the TTL signals to the regarding voltage level.
Conformance to the protection scheme defined in COM.0 Rev 2 for pins recovered from the 12V
pool results in a transfer rate limit of about 10 kbaud. If your situation requires higher speeds,
contact your Module vendor for possible work-arounds. The work-arounds likely involve
sacrificing the 12V protection as a tradeoff for higher speeds.
2.20.3. Routing Considerations
No further routing considerations need to be taken.
PICMG
®
COM Express
®
Carrier Board Design Guide Rev. 2.0 / December 6, 2013
126/218
C O M 1 C O M 2
S E R 0_ R X _T T L
S E R 0_ T X _T T L
S E R 1_ T X _T T L
S E R 1_ R X _T T L
S E R 0 _ R X _R S 2 3 2
S E R 0 _ T X _R S2 32
S E R 1 _ T X _R S2 32
S E R 1 _ R X _R S 2 3 2
S E R 0_ T X _T T L
S E R 0 _ R X _ T TL
S E R 1 _ R X _ T TL
S E R 1_ T X _T T L
S E R 0_ R X _R S2 3 2 S E R1 _R X _ R S 2 3 2
S E R 1 _ T X _R S2 3 2S E R 0_ T X _R S 23 2
VCC_3V3
VCC_3V3
VCC_3V3
VCC_3V3
VCC_3V3
VCC_3V3
C E X
S E R 0 _ R X
C E X
S E R 0 _ T X
C E X
S E R 1 _ R X
C E X
S E R 1 _ T X
C 2 5 7
1 0 0 n
2 2 5 8 9
2 0 1 - 10 0
1 0 %
5 0 V
Q 9
10 2 6 2
24 1 - 0 0 0
2N 7 0 0 2
60 V
3
1
2
C 2 40
1 0 0 n
2 2 5 8 9
2 0 1 -1 0 0
1 0 %
5 0 V
R 2 6 0
1 k
2 8 2 5 7
1 %
2 1 1 - 47 9
Q 1 5
10 2 6 2
24 1 - 0 0 0
2N 7 0 0 2
60 V
3
1
2
J1 0
A M P 5 1 0 33 08 -1
1 2 6 3 7
D T R
R T S
T X D
R X D
D C D
D S R
C T S
R I
G N D
N C
C 1 37
1 0 0 n
2 2 5 89
2 0 1 -1 0 0
1 0 %5 0 V
C 2 2 7
1 0 0 n
2 2 5 8 9
2 0 1 - 10 0
1 0 %
5 0 V
Q 1 1
10 2 6 2
24 1 - 0 0 0
2N 7 0 0 2
60 V
3
1
2
C 2 6 0
1 0 0 n
2 2 5 8 9
2 0 1 - 10 0
10 %
50 V
J9
A M P 5 1 0 3 3 08 -1
1 2 6 3 7
D T R
R T S
T X D
R X D
D C D
D S R
C T S
R I
G N D
N C
U 3 1
N C 7 S Z0 4
1 0 4 13
0 4 3 -0 0 19 -0 0
S O T 2 3 -5
2
3
4
5
1
Q 1 6
10 2 6 2
24 1 - 0 0 0
2N 7 0 0 2
6 0 V
3
1
2
C 1 28
1 0 0 n
2 2 5 89
2 0 1 -1 0 0
1 0 %5 0 V
U 6
2 6 9 6 8
1 0 1 - 31 5
M A X 3 2 3 2 C D
C 1 +
V +
C 1 -
C 2 +
C 2 -
V -
D O U T 2
R IN 2
V cc
G N D
D O U T 1
R IN 1R O U T 1
D IN 1
D IN 2
R O U T 2
R 2 3 7
4k 7
10 9 9 3
5 %
21 1 - 0 9 4
R 2 5 1
4k 7
10 9 9 3
5 %
21 1 - 0 9 4
R 2 42
4 k 7
1 0 9 93
5%
2 1 1 -0 9 4
U 2 7
N C 7 S Z 0 4
1 0 4 1 3
0 4 3 - 00 19 -0 0
S O T 2 3 -5
2
3
4
5
1
R 2 53
4 k 7
1 0 9 93
5%
2 1 1 -0 9 4
C 1 3 6
1 0 0 n
2 2 5 8 9
2 0 1 - 10 0
1 0 %
5 0 V
C 1 3 8
10 0 n
22 5 8 9
20 1 - 1 0 0
1 0 %
5 0 V
R 2 4 6
1 k
2 8 2 5 7
1 %
2 1 1 - 47 9
U 3 3
N C 7 S Z 0 4
1 0 4 1 3
0 4 3 - 00 19 -0 0
S O T 2 3 -5
2
3
4
5
1
C 1 2 1
1 0 0 n
2 2 5 8 9
2 0 1 - 10 0
1 0 %
5 0 V
U 3 6
N C 7 S Z0 4
1 0 4 13
0 4 3 -0 0 19 -0 0
S O T 2 3 -5
2
3
4
5
1
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
11
12
10
9
2
6
15
15
14
13
7
8
4
5
1
3
VCC _3V3 VCC_3V3
VCC_3V3
VCC_3V3
VCC_3V3
VCC _3V3
Seitenansicht 125
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