User's Manual

MeiG hardware design guide
26
4.17 Motor
The SLM756P supports motor functions that can be implemented by the user with GPIO control power.
The reference schematic is as follows:
Figure 4.32: Motor interface circuit
4.18 Antenna Interface
The module provides four antenna interfaces: MAIN antenna, DRX antenna, GPS antenna and
WiFi/BT antenna. In order to ensure that the user's products have good wireless performance, the
antenna selected by the user should meet the requirement that the input impedance is 50 ohms in the
working frequency band and the VSWR is less than 2.
4.18.1 Main Antenna
The module provides the MAIN antenna interface pin Pin1 RF_MAIN. The antenna on the user's main
board should be connected to the antenna pin of the module using a 50-ohm characteristic microstrip
line or strip line.
In order to facilitate antenna debugging and certification testing, an RF connector and antenna
matching network should be added. The recommended circuit diagram is as follows:
Figure 4.33: MAIN Antenna Interface Connection Circuit