Product Info

Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 38 / 129
3.5.1.1. UART Application
If the host communicates with module via UART interface, the following preconditions can let the module
enter into sleep mode.
 Execute AT+QSCLK=1 command to enable sleep mode.
 Drive DTR to high level.
The following figure shows the connection between the module and the host.
RXD
TXD
RI
DTR
TXD
RXD
EINT
GPIO
Module
Host
GND GND
Figure 4: Sleep Mode Application via UART
 Driving the host DTR to low level will wake up the module.
 When AG35 has URC to report, RI signal will wake up the host. Please refer to Chapter 3.20 for
details about RI behavior.
3.5.1.2. USB Application with USB Remote Wakeup Function
If the host supports USB suspend/resume and remote wakeup functions, the following three preconditions
must be met to let the module enter into sleep mode.
 Execute AT+QSCLK=1 command to enable sleep mode.
 Ensure the DTR is held in high level or keep it open.
 The host’s USB bus, which is connected with the module’s USB interface, enters into suspended
state.
The following figure shows the connection between the module and the host.