Product Info
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- 1 Introduction
- 2 Product Concept
- 3 Application Interfaces
- 3.1. General Description
- 3.2. Pin Assignment
- 3.3. Pin Description
- 3.4. Operating Modes
- 3.5. Power Saving
- 3.6. Power Supply
- 3.7. Power-on/off Scenarios
- 3.8. Reset the Module
- 3.9. (U)SIM Interfaces
- 3.10. USB Interface
- 3.11. UART Interfaces
- 3.12. PCM and I2C Interfaces
- 3.13. SPI Interface
- 3.14. Network Status Indication
- 3.15. STATUS
- 3.16. ADC Interface
- 3.17. Behaviors of RI
- 3.18. USB_BOOT Interface
- 4 GNSS Receiver
- 5 Antenna Interfaces
- 6 Electrical, Reliability and Radio Characteristics
- 7 Mechanical Dimensions
- 8 Storage, Manufacturing and Packaging
- 9 Appendix A References
- 10 Appendix B GPRS Coding Schemes
- 11 Appendix C GPRS Multi-slot Classes
- 12 Appendix D EDGE Modulation and Coding Schemes
LTE Standard Module Series
EG91 Hardware Design
EG91_Hardware_Design 27 / 93
Mode
Airplane
Mode
AT+CFUN command or W_DISABLE# pin can set the module to enter into airplane mode.
In this case, RF function will be invalid.
Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal level.
During this mode, the module can still receive paging message, SMS, voice call and
TCP/UDP data from the network normally.
Power Down
Mode
In this mode, the power management unit shuts down the power supply. Software is not
active. The serial interface is not accessible. Operating voltage (connected to VBAT_RF
and VBAT_BB) remains applied.
3.5. Power Saving
3.5.1. Sleep Mode
EG91 is able to reduce its current consumption to a minimum value during the sleep mode. The following
sub-chapters describe the power saving procedures of EG91 module.
3.5.1.1. UART Application
If the host communicates with the 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
AP_READY
TXD
RXD
EINT
GPIO
GPIO
Module
Host
GND
GND
Figure 3: Sleep Mode Application via UART
Driving the host DTR to low level will wake up the module.