User Guide

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GM500-U1G_A
Hardware Development Guide
Contents
Revision History ........................................................................................................................................................................... I
About This Document ....................................................................................................................................................................... II
Safety Information ......................................................................................................................................................................... IV
Contents .......................................................................................................................................................................... V
Tables ....................................................................................................................................................................... VIII
Figures .......................................................................................................................................................................... X
1. Product Overview ....................................................................................................................................................................... 12
1.1. General Description ........................................................................................................................................................................... 12
1.2. Key Features ................................................................................................................................................................................. 12
1.3. Function Diagram............................................................................................................................................................................... 13
1.4. Evaluation Board ................................................................................................................................................................................ 14
2. Application Interface ................................................................................................................................................................... 15
2.1. General Description ........................................................................................................................................................................... 15
2.2. Pin Assignment ................................................................................................................................................................................. 15
2.3. Pin Description ................................................................................................................................................................................. 16
2.4. Power Supply ................................................................................................................................................................................. 24
2.4.1. Power Supply Pins ................................................................................................................................................................... 24
2.4.2. Decrease Voltage Drop ............................................................................................................................................................ 25
2.4.3. Reference Circuit of Power Supply .......................................................................................................................................... 25
2.5. Turn on Scenarios .............................................................................................................................................................................. 26
2.6. Turn off Scenarios .............................................................................................................................................................................. 28
2.7. Reset Scenarios ................................................................................................................................................................................. 29
2.8. USIM Card Interface........................................................................................................................................................................... 31
2.8.1. Description of USIM pins ......................................................................................................................................................... 31
2.8.2. Design Considerations for USIM Card Holder .......................................................................................................................... 32
2.9. USB Interface ................................................................................................................................................................................. 35
2.10. UART Interface ................................................................................................................................................................................. 37
2.10.1. UART CONNECTION ............................................................................................................................................................... 37
2.10.2. UART LEVEL MATCH .............................................................................................................................................................. 38
2.10.3. Use ic for level switch ............................................................................................................................................................ 43
2.11. Network Status Indication ............................................................................................................................................................... 44
2.12. POWER_ON/OFF Status Indicator ON_STATE .................................................................................................................................. 45
2.13. ADC Interface ................................................................................................................................................................................. 46
2.14. WAKEUP_IN Signal ........................................................................................................................................................................... 47
2.15. WAKEUP_OUT Signal ....................................................................................................................................................................... 48