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attention to the direction of connection.
MCU/ARM
NOTES
1. Transistor circuit solution is not suitable for applications with high baud rates exceeding 460 kbps.
2. For the purpose of reducing power consumption, it is recommended to switch off the power supply for
in sleep mode.
VDD_1V8
3. Please note that the module CTS is connected to the host CTS, and the module RTS is connected to the host
RTS.
3.12. I2S and I2C Interfaces
The module provides I2S and I2C interfaces for audio function design.
Table 17: Pin Definition of I2S Interface
Pin Name
Pin No.
CDC_RST
77
I2S_MCLK
81
I2S_WS
265
I2S_SCK
262
I2S_DIN
263
AG521R-NA_QuecOpen_Hardware_Design
4.7K
VDD_1V8
1 nF
TXD
RXD
1 nF
10K
VCC_MCU
4.7K
RTS
CTS
GND
Figure 23: Reference Circuit with Transistor Circuit
I/O
Description
DO
Codec reset
DO
Clock output for codec
IO
I2S word select
DO
I2S clock
DI
I2S data in
Automotive Module Series
AG521R-NA QuecOpen Hardware Design
VDD_1V8
Module
10K
RXD
TXD
VDD_1V8
RTS
CTS
GND
Comment
1.8 V power domain.
Can be configured to GPIOs.
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