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 37 / 93
RESET
_
N
S
2
Close to S2
TVS
Figure 15: Reference Circuit of RESET_N by Using Button
The reset scenario is illustrated in the following figure.
V
IL
≤ 0.5V
V
IH
≥ 1.3V
VBAT
≥ 150ms
Resetting
Module
Status
Running
RESET_N
Restart
≤ 460ms
Figure 16: Reset Scenario
1. Use RESET_N only when turning off the module by AT+QPOWD command and PWRKEY pin
failed.
2. Ensure that there is no large capacitance on PWRKEY and RESET_N pins.
3.9. (U)SIM Interfaces
EG91 provides two (U)SIM interfaces, and only one (U)SIM card can work at a time. The (U)SIM1 and
(U)SIM2 cards can be switched by AT+QDSIM* command. For more details, please refer to document
[2].
The (U)SIM interfaces circuitry meet ETSI and IMT-2000 requirements. Both 1.8V and 3.0V (U)SIM cards
are supported.
NOTES