Uart Application; Usb Application With Usb Remote Wakeup Function - Quectel EC25-AUX Hardware Design

3.5.1.1. UART Application

If the host communicates with module via UART interface, the following preconditions can let the module
enter 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.
 Driving the host DTR to low level will wake up the module.
 When EC25 has a URC to report, RI signal will wake up the host. Please refer to Chapter 3.19 for
details about RI behaviors.
 AP_READY will detect the sleep state of the host (can be configured to high level or low level
detection). Please refer to AT+QCFG="apready" command for details.

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 sleep mode.
 Execute AT+QSCLK=1 command to enable sleep mode.
 Ensure the DTR is held at high level or keep it open.
 The host's USB bus, which is connected with the module's USB interface, enters suspend state.
The following figure shows the connection between the module and the host.
EC25_Hardware_Design
Figure 3: Sleep Mode Application via UART
LTE Standard Module Series
EC25 Hardware Design
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