Service Guide
Table Of Contents
- Safety Information
- About the Document
- Contents
- Table Index
- Figure Index
- 1 Introduction
- 2 Product Overview
- 3 Operating Characteristics
- 4 Application Interfaces
- 5 Antenna Interfaces
- 6 Reliability, Radio, and Electrical Characteristics
- 7 Mechanical Information
- 8 Storage, Manufacturing, and Packaging
- 9 Appendix References
LTE Standard Module Series
EG915U_Series_Hardware_Design 30 / 90
In this case, three preconditions can make the module enter the sleep mode.
⚫ Execute AT+QSCLK=1 to enable sleep mode.
⚫ Ensure the MAIN_DTR is held at high level or keep it open.
⚫ Ensure the host’s USB bus, which is connected with the module’s USB interface, enters suspend
state.
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 MCU
GND
GND
MAIN_RI
EINT
Figure 5: Sleep Mode Application with MAIN_RI
⚫ You can wake up the module by sending data to it through USB.
⚫ When the module has a URC to report, the URC will trigger the behaviors of MAIN_RI pin. See
Chapter 4.10.3 for details about MAIN_RI behaviors.
⚫
3.2.2.3. USB Application without USB Suspend Function
If the host does not support USB suspend function, disconnect USB_VBUS with an external control circuit
to make the module enter into sleep mode.
⚫ Execute AT+QSCLK=1 command to enable sleep mode.
⚫ Ensure the MAIN_DTR is held at a high level or keep it open.
⚫ Disconnect the USB_VBUS.
The following figure illustrates the connection between the module and the host.
USB suspend is supported on Linux system but not on Windows system.
NOTE