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MG3732 module
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Other Advice
In order to make sure the data is saved safely, please don’t cut off the power when the module is on. It’s
strongly recommended to use ON/OFF pin or AT command to turn off the mobile phone.
4.3
COM Port
The module provides a full duplex UART interface, whose maximal data rate is 230.4kbps and typical data rate
is 11.5kbps. External interface is 1.8VCMOS level signal, which could be used for upgrade, port
communication, etc.
When using MG3732 module’s UART port to communicate with PC or MCU, please pay attention to the
direction of TX, RX. It’s specially noted that MG3732 module’s UART port only supports 1.8V, therefore for
non 1.8V external UART, it needs to convert the level. Normally a dynatron is used to realize the level
conversion. As shown in figure 4-1, the resistance is just for your information, please calculate again during the
design.
Figure 4-1 UART Interface Reference Design Diagram
4.4
UIM Card Interface