Quectel BG772A-GL Hardware Design page 44

Figure 17: Main UART Reference Design (Translator Chip)
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Another example with transistor translation circuit is shown as below. For the design of circuits in dotted
lines, refer to that of circuits in solid lines, but pay attention to the direction of connection.
Figure 18: Main UART Reference Design (Transistor Circuit)
NOTES
1. Transistor circuit solution is not suitable for applications with high baud rates exceeding 460 kbps.
2. The main UART of the module shouldn't be asserted high during PSM,
chip.
BG772A-GL_Hardware_Design
LPWA Module Series
BG772A-GL Hardware Design
otherwise, it will damage the
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