Product Info

Automotive Module Series
AG521R-NA QuecOpen Hardware Design
AG521R-NA_QuecOpen_Hardware_Design 52 / 104
attention to the direction of connection.
MCU/ARM
TXD
RXD
VDD_1V8
10K
VCC_MCU
4.7K
10K
VDD_1V8
TXD
RXD
RTS
CTS
RTS
CTS
GND
Module
VDD_1V8
4.7K
GND
1 nF
1 nF
Figure 23: Reference Circuit with Transistor Circuit
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
VDD_1V8 in sleep mode.
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.
I/O
Description
Comment
CDC_RST
77
DO
Codec reset
1.8 V power domain.
Can be configured to GPIOs.
I2S_MCLK
81
DO
Clock output for codec
I2S_WS
265
IO
I2S word select
I2S_SCK
262
DO
I2S clock
I2S_DIN
263
DI
I2S data in
NOTES