Quectel EG915U Series User Manual

LTE Standard Module Series
EG915U_Series_Hardware_Design 27 / 81
3.2.2. USB Application Scenario
If the host supports USB suspend/resume and remote wakeup functions, the following three preconditions
can make the module enter the sleep mode.
⚫ Execute AT+QSCLK=1 to enable the sleep mode.
⚫ Ensure the MAIN_DTR is kept at high level or kept open.
⚫ Ensure 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.
3.2.2.1. USB Application with USB Remote Wakeup Function
The host supports USB Suspend/Resume and remote wakeup function.
The following figure illustrates the connection between the module and the host.
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module
Host
GND
GND
Figure 4: Sleep Mode Application with USB Remote Wakeup
⚫ You can wake up the module by sending data to it through USB.
⚫ When the module has a URC to report, the module will send remote wakeup signals via USB bus so
as to wake up the host.
⚫
NOTE

Quectel EG915U Series Specifications

General

Operating Temperature	-40°C to +85°C
Form Factor	LGA
Interface	UART, GPIO, I2C, SPI
Power Supply	3.3V to 4.3V
GNSS	GPS, GLONASS, BeiDou, Galileo, QZSS
Protocol Support	TCP/UDP/PPP/FTP/HTTP/SSL/MQTT
Certifications	CE, FCC, RoHS

Summary

Product Overview

Key Features

Lists the main technical features of the EG915U series module.

Pin Assignment

Illustrates the pin layout of the EG915U module.

Pin Description

Details the function and characteristics of each pin.

Operating Characteristics

Operating Modes

Outlines the different operating modes of the module.

Sleep Mode

Details how to reduce module current consumption in sleep mode.

Power Supply

Details power supply requirements and pins.

Turn on

Describes how to turn on the module.

Turn off

Explains procedures for turning off the module.

Reset

Explains how to reset the module using the RESET_N pin.

Application Interfaces

Analog Audio Interfaces

Describes the analog audio input and output interfaces.

USB Interface

Details the USB interface capabilities and specifications.

(U)SIM Interface

Describes the dual SIM interfaces and their support.

UART Interfaces

Describes the main, debug, and auxiliary UART interfaces.

Electrical Characteristics & Reliability

Absolute Maximum Ratings

Lists the absolute maximum ratings for power supply and voltage.

Power Supply Ratings

Details the power supply ratings of the module.

Tx Power

Specifies the transmit RF output power for different frequency bands.

Rx Sensitivity

Details the conducted RF receiving sensitivity for different bands.

Mechanical Information

Mechanical Dimensions

Shows the physical dimensions of the module.

Recommended Footprint

Provides a recommended footprint for PCB layout.