Carrier Board Design Guide for SOM-9X35 Module
50
The carrier board USB Port0 trace length and mismatch calculations should take into account the USB Port0
from the SOM-9X35 module.
Net Name
Trace
Length
(mil)
Length
Spec
(mil)
Length
Mismatch
(mil)
Length
Mismatch
Spec (mil)
Total
Delay
(Trace +
Via) (ps)
Delay
Mismatch
(ps)
Delay
Mismatch
Spec (ps)
Notes
USB_DP_P0
1942.178
10000
0.72
6.75
335.14
-0.09
1
Inter-pair
USB_DM_P0
1941.456
335.23
Table 27:
USB Port0 trace & via delay
The carrier board USB Port1 trace length and mismatch calculations should take into account the USB Port1
from the SOM-9X35 module.
Net Name
Trace
Length
(mil)
Length
Spec
(mil)
Length
Mismatch
(mil)
Length
Mismatch
Spec (mil)
Total
Delay
(Trace +
Via) (ps)
Delay
Mismatch
(ps)
Delay
Mismatch
Spec (ps)
Notes
USB_DP_P1
2075.870
10000
2.68
6.75
358.79
-0.13
1
Inter-pair
USB_DM_P1
2073.186
358.92
Table 28:
USB Port1 trace & via delay
4.5.3
USB Reference Schematics
0.5A
0.5A
limit=6.8/Rset(Kohm)=6.8/12=567mA
Rset
Rds(on) 0.1Ohm
R2 2021/3/23 for EMI Debug issue:
C112 0.1uF-->0.022uF
5V_SUS
5V_SUS
5V_OTG
USBOTG_DRVVBUS
[5]
C108
0.1uF
16V
X7R
C107
10uF
16V
X7R
CAP1206
R72
12K_1%
R71
10K/X
U5
SY6280AAC
OUT
1
GND
2
SET
3
EN
4
IN
5
C106
0.022uF
16V
X7R
R70
100K_1%
R69
10K
OTG_EN
OTG_ISET
OTG_ISET
Micro USB
5V_USB_OTG
5V_OTG
USB_P0_DP
USB_P0_DM
C771
5600pF
50V
X7R
C105
22uF
10V
X7T
CAP0805
C102
2.2uF
10V
X7R
C103
10uF
16V
X7R
CAP1206
C104
22uF
10V
X7T
CAP0805
C767
0.047uF
16V
X7R
C768
2700pF
50V
X7R
L2
EOWS201212M900
2.0mm*1.2mm*1.2mm/4PAD
90 OHM±25%
100MHZ
3
2
1
4
C769
270pF
50V
X7R
ESD16
TLSD05CBL
5V
5pF
1
2
ESD17
TUSD05CBL
5V
0.3PF
1
2
C770
39pF
50V
NPO
J5
22TBH-051-129L
VBUS
1
D-
2
D+
3
ID
4
GND
5
G
N
D
G
1
G
N
D
G
2
G
N
D
G
3
G
N
D
G
4
C101
0.1uF
16V
X7R
ESD18
TUSD05CBL
5V
0.3PF
1
2
FB10
ZFB-0805H-121NC
120 OHM
6000mA
SMT0805
RN3
0/X
1
2
3
4
USB_OTG_5V1
1
USB_OTG_DM
USB_OTG_DP
USB_OTG_ID
[5]
[5]
USBOTG_ID
[5]
ESD19
TLSD05CBL
5V
5pF
1
2
R74
33
USB_OTG_ID
Figure 60:
USB Port0 reference circuitry