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 35 / 90
3.5. Turn On
3.5.1. Turn On with PWPKEY
Table 9: Pin Definition of PWRKEY
When the module is in power down mode, you can turn it on to normal mode by driving the PWRKEY pin
low for at least 2 s. It is recommended to use an open drain/collector driver to control the PWRKEY. A
simple reference circuit is illustrated in the following figure.
PWRKEY
4.7K
47K
Turn-on pulse
2 s
10 nF
Figure 10: Turning on the Module Using Driving Circuit
Another way to control the PWRKEY is using a button directly. When you are pressing the key,
electrostatic strike may be generated from finger. Therefore, you must place a TVS component nearby the
button for ESD protection. A reference circuit is shown in the following figure.
PWRKEY
S1
Close to S1
TVS
Figure 11: Turning on the Module Using Button
Pin Name
Pin No.
I/O
Description
Comment
PWRKEY
15
DI
Turns on/off the module
VBAT power domain.