User Manual

MeiG_SLM550_Hardware Design Manual
MeiG Smart Technology Co., Ltd 56/89
GPIO101 102 I I2S1 Input DATA
GPIO98 104 O I2S1_ SLK
4.9 USB Interface
The SLM550 supports a USB 2.0 High speed interface (Type-C optional). It must control the 90 ohm
differential impedance during Layout and control the external trace length.
The module supports OTG function.
The voltage input range during charging is as follows:
Table 12 Voltage input range during charging
Name Description Minimum Typical
Maximu
m
Unit
VBUS Input range 4 - 6.3 V
The USB plug-in detection of the module is realized by the VBUS and DP/DM data lines. When the
USB cable is inserted, the VBUS voltage is detected first, and then the DM/DP pull-up state is detected
to determine whether the USB data line or the charger is inserted. Therefore, if you need to use the
USB function, please be sure to connect VBUS to the 5V power supply on the data line.
USB is a high-speed mode. It is recommended to connect a common-mode inductor to the side of the
USB connector to effectively suppress EMI interference. At the same time, the USB interface is an
external interface. The DM/DP must add a TVS tube to prevent static damage caused by plugging and
unplugging the data cable. When selecting the TVS, the user should pay attention to the load
capacitance of less than 1pf. VBUS also needs to increase the TVS tube. If there is anti-surge demand,
it is also necessary to increase the anti-surge tube. The connection diagram is as follows:
Figure 31 USB Connection Diagram