Product Info

Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 54 / 129
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Another example with transistor translation circuit is shown as below. The circuit design of dotted line
section can refer to the design of solid line section, in terms of both module input and output circuit
designs. But please pay attention to the direction of connection.
MCU/ARM
/TXD
/RXD
VDD_1V8
10K
VCC_MCU
4.7K
10K
VDD_1V8
UART1_TXD
UART1_RXD
UART1_RTS
UART1_CTS
UART1_DTR
UART1_RI
/RTS
/CTS
GND
GPIOUART1_DCD
Module
GPIO
EINT
VDD_1V8
4.7K
GND
1nF
1nF
Figure 24: Reference Circuit with Transistor Circuit
1. The above is a reference circuit of UART1 interface, which is similar to that of other UART interfaces.
2. Transistor circuit solution is not suitable for applications with high baud rates exceeding 460Kbps.
3. When the module enters into sleep mode, it is recommended to switch off the power supply for
VDD_1V8 so as to reduce power consumption.
4. “*” means under development.
3.12. Audio Interface (Optional)
AG35 is designed with an optional built-in audio codec to enable analog audio function. The following
table shows the pin definition of analog audio interface.
Table 16: Pin Definition of Analog Audio Interface
Pin Name
Pin No.
I/O
Description
Comment
SPK2_P
132
AO
Earphone analog output 2 (+)
NOTES