Quectel EG915U-EU - Page 49

LTE Standard Module Series
EG915U-EU_Hardware_Design 48 / 81
MCU/ARM
TXD
RXD
VDD_EXT
10K
VCC_MCU
4.7K
10K
VDD_EXT
MAIN_TXD
MAIN_RXD
MAIN_RTS
MAIN_CTS
MAIN_DTR
MAIN_RI
RTS
CTS
GND
GPIO MAIN_DCD
Module
GPIO
EINT
VDD_EXT
4.7K
GND
1 nF
1 nF
Figure 24: Reference Circuit with Transistor Circuit
1. Transistor circuit solution is not suitable for applications with baud rates exceeding 460 kbps.
2. Module’s CTS connect to MCU’s CTS, module’s RTS connect to MCU’s RTS. In addition, pay
attention to UART’s CTS and RTS input and output directions.
NOTE