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COM Express Interfaces
2.21.2. Reference Schematics
2.21.2.1. CAN Bus Example
Figure 50: CAN Bus Example
Figure 50: CAN Bus Example shows the schematics of a CAN Bus implementation with the CAN
Transceiver TJA10407 (U25). The transistor / inverter combination at the CAN_TX and CAN_RX
line 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 Diodes D31 and D32 accomplish ESD
protection.
J33 is a DSUB-9 connector in standardized CAN pin-out. Please refer to Table 41: Pin-out Table
DSUB-9 CAN Connector below.
If an ODB-II adapter is used pin 9 carries the car battery voltage. The automotive power rail is a
difficult rail to work with. It is nominally a 12V rail but may dip to 6V when the engine is cranking
and may be up to 16V when the engine is running and there may be transients in excess of +/-
100V.
Table 41: Pin-out Table DSUB-9 CAN Connector
J33 (9 positions) Pin description
2 CAN_L
7 CAN_H
9 VCC
3 GND
The COM Express Specification conform 12V protection will decrease the maximum transfer rate
to about 10kbaud. For higher speed please contact your Module vendor to find a solution.
2.21.3. Routing Considerations
It should be routed as a differential pair signal with 120 Ohm differential impedance. The end
points of CAN bus should be terminated with 120 Ohms or with 60 Ohms from the CAN_H line
and 60 Ohms from the CAN_L line to the CAN Bus reference voltage. Check your CAN
transceiver application notes for further details on termination.
PICMG
®
COM Express
®
Carrier Board Design Guide Rev. 2.0 / December 6, 2013
128/218
CEX
SER1_TX_ Q
SER1_RX_Q
CAN_SP LIT
CAN_STB
CAN_L
CAN_H
V5.0_CAN
SER1_T X#
SER1_RX#
SER1_RX_R
CAN_L
CAN_H
VCC_5V0
VCC_5V_SBY
VCC_3V3
VCC_3V3
CAN_TX
CAN_RX
R187
R1%0R0S02
D32
EZA E G 2A 50 A X
R35 0
R1k 006
R230
R1% 0R0S02
U25
TJA 1040T
VCC
3
TX D
1
CAN H
7
GND
2
SPLIT
5
RXD
4
CANL
6
STB
8
R18 4
R1% 10K 0S0 2
C15 1
C47 UV16S10
R183
R1%10K0S02
C262
C10 0N02V16
nc
U45A
NC7SZ1 4
1
2 4
U45 B
NC7SZ14
GN D
3
VC C
5
R24 7
R1%0R0S 0 2
Q43
BSS138W
3
1
2
C15 0
C10 0N02V16
R185
R1%60R4S02
R186
R1%60R4S02
Q16
BSS138W
3
1
2
R337
R1%4K7S02
Q18
BSS138W
3
1
2
R34 2
R1% 4K7S02
J33
STDB9
D31
EZAEG2A50A X
R34 3
R1% 4K7S 02
C152
C470P S0 2
CEX
DNI
1
2
3
4
5
6
7
8
9
VCC_3V3
- COM Express® 1
- Carrier Design Guide 1
- Contents 3
- 1. Preface 8
- 1.6. Name and logo usage 9
- 1.7. Intellectual property 10
- Term Description 11
- 1.10. Schematic Conventions 15
- 2. COM Express Interfaces 16
- COM Expre ss Module 17
- Type 10 17
- Table 4: Pin-out Comparison 20
- , the PCI 30
- 2.3.5. Schematic Examples 34
- Signal Pin Description I/O 45
- Figure 15: ExpressCard Size 45
- 2.4.1. Signal Definitions 48
- 2.4.2. PEG Configuration 49
- 2.4.3. Reference Schematics 52
- DisplayPort is supported 55
- DisplayPort Example 56
- Figure 21: HDMI Example 57
- Figure 22: DVI Example 59
- SDVO Port Configuration 61
- Supported SDVO Devices 62
- DVI_SDAROM 63
- DVI_SCLROM 63
- SDVO I2C Bus Address 63
- Write = 0111 0000 (70h) 63
- Read = 0111 0001 (71h) 63
- 2.6.1. Signal Definitions 66
- Earliest asserted 1ms after 68
- 3.3V, 5V and 12V are stable 68
- 2.7. LAN 70
- 2.7.2. Reference Schematics 73
- 2.8. USB Ports 76
- 2.8.2. Reference Schematics 77
- 2.9. USB 3.0 81
- 2.9.1.3. USB 3.0 connector 83
- 2.9.2. Reference Schematics 84
- 2.10. SATA 87
- Pins Signal Description 88
- SATA Port 89
- 2.11. LVDS 91
- Term Definition 94
- 2.11.2. Reference Schematics 97
- 2.12.1. Signal Definitions 99
- 2.12.2. Reference Schematics 100
- 2.13. VGA 101
- COM Express Interfaces 102
- 2.14. TV-Out 104
- COM Express Module 106
- AUDIO POWER 107
- AUDIO CODEC - ALC888 107
- ANALOG I/O CONNECTOR 107
- 2.15.1.2. AC'97 108
- Figure 41: Audio Amplifier 109
- 2.16.1. Signal Definition 111
- SUPER I/O 115
- COM1/COM2 116
- 2.17.1. Signal Definition 118
- 2.18.1. Signal Definitions 121
- 2.18.2. Reference Schematics 121
- 2.19.1. Signal Definitions 123
- 2.20.1. Signal Definitions 125
- C O M 1 C O M 2 126
- 2.21. CAN Interface 127
- 2.21.2. Reference Schematics 128
- 2.22. Miscellaneous Signals 129
- POWER ATX 133
- POWER AT 133
- Type 2 Detection 133
- 2.22.5. Watchdog Timer 137
- G P IO C o n n e c t o r 141
- 2.22.8. Fan Connector 142
- 2.22.9. Thermal Interface 143
- 2.23. PCI Bus 147
- 2.23.2. Reference Schematics 148
- 2.24.1. Signal Definitions 153
- 3. Power and Reset 156
- 3.2.1. ATX vs AT Supplies 157
- 3.2.2. Power States 157
- Power and Reset 158
- 3.2.5. Power Button 162
- 3.4. Reference Schematics 164
- Table 55: ATX Signal Names 166
- ATX Signal Name Description 166
- 3.5. Routing Considerations 167
- 3.5.3. VCC5_SBY Routing 168
- 4. BIOS Considerations 170
- Type Height Partnumber Note 171
- COM Express Module Connectors 172
- GND Plane 173
- Power Plane 173
- COM Express 175
- Table 60: Trace Parameters 176
- Symbol Definition 176
- Carrier Board 178
- Parameter Trace Routing 183
- Extended 194
- 7.2. Heatspreader 195
- (Ø2.7mm bore hole) 196
- (M2.5 thread) 196
- (Ø2.7 bore hole) 197
- Mechanical Considerations 198
- 8.3. Useful books 202
- 9.1. TV-Out 203
- 9.1.5. Signal Termination 206
- 9.1.6. Video Filter 206
- 9.1.7. ESD Protection 206
- 9.2. LPC Firmware Hub 207
- Appendix C: List of Tables 213
- Appendix D: List of Figures 215
- Table 79: Revision History 217
- Revision Date Author Changes 217
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