Product Info
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- Introduction
- Product Concept
- Application Interfaces
- GNSS Receiver
- Antenna Interfaces
- Electrical, Reliability and RadioCharacteristics
- Mechanical Dimensions
- Storage, Manufacturing and Packaging
- Appendix A References
LTE Module Series
EG61-NA Hardware Design
EG61-NA_Hardware_Design 51 / 77
Module
USB_BOOT
VDD_EXT
4.7K
Test point
TVS
Close to test point
Figure 28: Reference Circuit of USB_BOOT Interface
V
IL
≤0.5V
V
IH
≥1.3V
VBAT
PWRKEY
≥500ms
RESET_N
NOTE
VDD_EXT
About 100ms
USB_BOOT
Setting USB_BOOT to high level between
VBAT rising on and VDD_EXT rising on can let
the module enter into emergency download
mode
Figure 29: Timing Sequence for Entering into Emergency Download Mode
1. Please make sure that VBAT is stable before pulling down PWRKEY pin, and the time between
themis no less than 30ms.
2. The recommended pull-up level range is 1.3V~2.1V if a pull-up circuit is added on PWRKEY pin.
NOTES