Service Guide
Table Of Contents
- Safety Information
- About the Document
- Contents
- Contents
- Table Index
- Figure Index
- 1 Introduction
- 2 Product Overview
- 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. Turn on/Turn off/Reset
- 3.8. (U)SIM Interfaces
- 3.9. USB Interface
- 3.10. UART Interfaces
- 3.11. SPI Interface
- 3.12. I2C Interfaces
- 3.13. PCM Interface
- 3.14. Analog Audio Interfaces
- 3.15. LCD Interface
- 3.16. Matrix Keyboard Interface
- 3.17. SD Card Interface
- 3.18. WLAN Application Interface*
- 3.19. ADC Interfaces
- 3.20. Network Status Indication
- 3.21. STATUS
- 3.22. Behaviors of MAIN_RI
- 3.23. USB_BOOT Interface
- 4 Antenna Interfaces
- 5 Electrical Characteristics, Radio and Reliability
- 6 Mechanical Information
- 7 Storage, Manufacturing & Packaging
- 8 Appendix References
LTE Standard Module Series
EC200U_Series_Hardware_Design 33 / 94
DC_IN
MIC29302WU
IN OUT
EN
GND
ADJ
2 4
1
3
5
VBAT
100 nF
100 nF
100K
47K
470R
51K
1 %
1 %
4.7K
47K
VBAT_EN
470 μF
470 μF
Figure 9: Reference Circuit of Power Supply
3.6.4. Monitor the Power Supply
You can use AT+CBC to monitor the VBAT_BB voltage value. For more details, see document [2].
3.7. Turn on/Turn off/Reset
3.7.1. Turn on Module with PWRKEY
Table 10: Pin Description of PWRKEY
Pin Name
Pin No.
I/O
Description
Comment
PWRKEY
21
DI
Turn on/off the module
VBAT power domain
When the module is in power-off mode, it can be turned on to normal mode by driving PWRKEY to a low
level 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.