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User's Manual l MBa6ULxL UM 0102 l © 2022, TQ-Systems GmbH Page 12
3.2.2 USB 2.0 Hi-Speed OTG
Both USB-OTG interfaces of the TQMa6ULxL are provided on the MBa6ULxL.
USB-OTG1 is provided at a 5-pin Micro-AB receptacle. USB-OTG2 is connected to the USB hub controller, see 3.2.1.
Both OTG interfaces operate in host mode only.
An OTG or device function is not implemented in software except for the serial downloader.
TQMa6ULxL
USB
Micro AB
(X15)
Power switch
CMC
USB OTG 1
USB OTG 2
PWR
USB HUB
Figure 8: Block diagram USB 2.0 Hi-Speed OTG
The following table shows the pinout of the connector used.
Table 13: Pinout USB-Host OTG – X15
Pin Pin name Signal Direction Remark
1 VBUS USB_OTG2_VBUS P 100 µF to DGND; EMI filter, I
max
= 100 mA
2 D– USB_OTG2_D_N I/O Common mode choke in series
3 D+ USB_OTG2_D_P I/O Common mode choke in series
4 ID USB_OTG2.ID I –
5 DGND DGND P –
M1 – M6 DGND DGND P –
The interface can serve as Client or Host. To use this feature, appropriate software support is necessary, however.
The OTG ports of the TQMa6ULxL provide a theoretical data rate of 480 Mbit/s. The data rate can significantly deviate depending
on the hardware and software used.
Table 14: Characteristics USB 2.0 Hi-Speed OTG
Parameter Min. Typ. Max. Unit Remark
Voltage 4.75 5 5.25 V –
Current – 500 900 mA –
Read – 20.4 – Mbyte/s USB 2.0 stick: 100 Mbyte file, 10 Mbyte block size
Write – 8.0 – Mbyte/s USB 2.0 stick: 100 Mbyte file, 10 Mbyte block size