MeiG_SLM550_Hardware Design Manual
MeiG Smart Technology Co., Ltd
63/89
4.16 Motor
The SLM550 supports motor functions and can be implemented by the user via PM_VIB_DRV_N
(28PIN). The reference schematic diagram is as follows. Note that the uF-level capacitor cannot be
placed on the signal line.
Figure 37 Motor interface circuit
4.17 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.
4.17.1 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 38 MAIN Antenna Interface Connection Circuit
Module
RF Test Head
Antenna
