Uart - Quectel RG520N-AT Hardware Design

Table 19: Pin Definition of Bluetooth PCM Interface
Pin Name
PCM_SYNC
PCM_CLK
PCM_DIN
PCM_DOUT
The reference design is illustrated as follows:

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
MAIN_TXD
RG520N-AT_Hardware_Design
Pin No. I/O
71 DIO
73 DIO
74 DI
76 DO
Figure 26: Reference Circuit of Bluetooth PCM Interface
Pin No. I/O
68 DO
Description
PCM data frame sync
PCM clock
PCM data input
PCM data output
Description
Main UART transmit
5G Module Series
Comment
If unused, keep them
open.
Comment
1.8 V power domain.
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