User's Manual l MBa7x UM 0101 l © 2020, TQ-Systems GmbH
Page 27
4.2.2
USB 2.0 Hi-Speed OTG
Both USB-OTG interfaces of the TQMa7x are provided on the MBa7x. OTG1 is available with all module variants as 5-pin Micro AB
socket. OTG2 is only available at the Mini PCIe connector when the TQMa7D is used.
TQMa7x
USB OTG 1
USB
Micro AB (X5)
Power Switch
CMC
Mini PCIe circuitry
PWR
USB OTG 2
Figure 16: Block diagram USB 2.0 Hi-Speed OTG
The interface can be a client or a host. To use this feature the appropriate software support is necessary, however.
The OTG port provides a theoretical data rate of 480 Mbit/s. The data rate can significantly deviate depending on the hardware
and software used.
Table 23:
Characteristics USB 2.0 Hi-Speed OTG
Parameter
Min.
Typ.
Max.
Unit
Remark
Voltage
4.75
5.00
5.25
V
–
Current
–
500
900
mA
–
Load step change
–
–85
–
mV
Load step of 500 mA
Read rate
–
27.6
–
Mbyte/s
USB-HDD at USB-OTG: 2 Gbyte file, 10 Mbyte block size
Write rate
–
22
–
Mbyte/s
USB-HDD at USB-OTG: 2 Gbyte file, 10 Mbyte block size
Figure 17: Position of USB 2.0 Hi-Speed OTG, X5
