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MeiG Smart product technical information

SLM500 Hardware Design Guide Page 47

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 4.26: USB Connection Diagram

4.9.1. USB OTG

The SLM500 module can provide USB OTG function. The pins used in this function are as

follows:

Table 4.10: USB OTG Pin Description

Pin name

Description

VBUS

141、142

5V charging input / OTG output power.

USB_HS_DM

USB Date-

USB_HS_DP

USB Date+

USB_HS_ID

USB ID