Quectel RG520N-AT - Uart

5G Module Series
RG520N-AT_Hardware_Design 55 / 109
Table 19: Pin Definition of Bluetooth PCM Interface
The reference design is illustrated as follows:
PCM_DIN
PCM_DOUT
PCM_SYNC
PCM_CLK
Module
PCM_CLK
PCM_SYNC
PCM_DIN
PCM_DOUT
Bluetooth
Figure 26: Reference Circuit of Bluetooth PCM Interface
4.7. UART
It provides three UART: main UART, debug UART, Bluetooth UART*. The following shows their features:
⚫ Main UART supports 115200 bps baud rate by default. It is used for AT command communication.
⚫ Debug UART supports 115200 bps baud rate. It is used for Linux console and log output.
⚫ Bluetooth UART supports 115200 bps baud rate. It is used for Bluetooth communication. It supports
RTS and CTS hardware flow control.
Pin definition of UART is listed as follows:
Table 20: Pin Definition of UART
Pin Name
Pin No.
I/O
Description
Comment
PCM_SYNC
71
DIO
PCM data frame sync
If unused, keep them
open.
PCM_CLK
73
DIO
PCM clock
PCM_DIN
74
DI
PCM data input
PCM_DOUT
76
DO
PCM data output
Pin Name
Pin No.
I/O
Description
Comment
MAIN_TXD
68
DO
Main UART transmit
1.8 V power domain.