User's Manual l MBLS1028A UM 0100 l © 2020, TQ-Systems GmbH
Page 14
4.3.2
USB 3.0 Hub
The TI USB 3.0 Hub TUSB8041 connected to the USB 3.0 OTG port (USB2) of the TQMLS1028A provides four USB HOST ports.
Two ports (USB Host1&2) are routed as USB 3.0 interfaces to a stacked connector (X10), the third port is routed as USB 2.0
interface to the mPCIe connector X12, the fourth port is routed as USB 2.0 interface to header X38.
The USB 3.0 Hub TUSB8041 can be programmed via I
2
C, the address is 0x44 / 100 0100b, see also Table 4.
A power distribution switch provides 5 V for the USB connectors. The current is monitored and can be switched off in case of an
overload and/or overheating.
Figure 13: Block diagram USB 3.0 Hub
The USB host port of the TQMLS1028A provides a theoretical data rate of 5 Gbit/s. This is divided among the connected ports.
Depending on the software and hardware used, the effective read and write rates of the ports may vary.
The following table shows the pinout of the stacked connector X10.
Table 7:
Pinout USB Host1&2, USB Type A, X10
Pin
Pin name
Signal
Remark
1
VBUS_2
V_VBUS_DN2
100 µF to DGND + EMI filter
2
D–_2
USB_DN2_D–
Common Mode Choke in series
3
D+_2
US
Common Mode Choke in series
4
GND_2
DGND
–
5
SSRX–_2
USB_DN2_RX–
Common Mode Choke in series
6
SSRX+_2
USB
Common Mode Choke in series
7
GND-DRAIN_2
DGND
–
8
SSTX–_2
USB_DN2_TX–
Common Mode Choke in 100 nF AC coupling capacitor
9
SSTX+_2
USB
Common Mode Choke in 100 nF AC coupling capacitor
10
VBUS_1
V_VBUS_DN1
100 µF to DGND + EMI filter
11
D–_1
USB_DN1_D–
Common Mode Choke in series
12
D+_1
US
Common Mode Choke in series
13
GND_1
DGND
–
14
SSRX–_1
USB_DN1_RX–
Common Mode Choke in series
15
SSRX+_1
USB
Common Mode Choke in series
16
GND-DRAIN_1
DGND
–
17
SSTX–_1
USB_DN1_TX–
Common Mode Choke in 100 nF AC coupling capacitor
18
SSTX+_1
USB
Common Mode Choke in 100 nF AC coupling capacitor
M1 … M4
Shield
DGND
–
Table 8:
Pinout USB Host3, mPCIe connector, X12
Pin
Pin name
Signal
Remark
36
D–
USB_DN3_D–
Common Mode Choke in series
38
D+
US
Common Mode Choke in series
Table 9:
Pinout USB Host4, 40-pin header, X38
Pin
Pin name
Signal
Remark
31
D+
US
Common Mode Choke in series
35
D–
USB_DN4_D–
Common Mode Choke in series