MeiG Smart product technical information
SLM758
Hardware Design Guide
Page 53
4.9.5.I2S Interface
There are two sets of GPIO-compatible I2S interfaces inside the module. The pins used by
this function are as follows:
Name
Pin
Intput/Output
Description
GPIO88_HOMEKEY_MI2S1_D1
27
I
I2S1 input DATA
GPIO93_MI2S_1_D0
265
O
I2S1 output DATA
GPIO92_MI2S_1_WS
271
O
I2S1_ WS
GPIO91_MI2S_1_SCK
169
O
I2S1_ SLK
GPIO138_FP_SPI_MISO
266
I
I2S2 input DATA
GPIO137_FP_SPI_MOSI
267
O
I2S2 output DATA
GPIO136_FP_SPI_CS
268
O
I2S2_WS
GPIO135_FP_SPI_CLK
269
O
I2S2_SCK
4.10. USB Interface
The SLM758 supports a USB 2.0 /3.0High/Super speed interface. It must control the 90 ohm
differential impedance during Layout and control the external trace length.
The module supports OTG function at the same time and can output 5V/1A current.
The voltage input range during charging is as follows:
Table 4.9: Voltage input range during charging
Name
Description
Minimum
Typical
Maximum
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:
