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MeiG Smart product technical information
SLM500 Hardware Design Guide Page 52
4.16. Motor
The SLM500 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 4.32: 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 4.34: MAIN Antenna Interface Connection Circuit