Hardware Design SIM800L (SIMCom) - 4

Smart Machine Smart Decision 4.8.3. 4.9. Design Considerations for SIM Card Holder . 40 PCM Interface .42 4.9.1.
4.9.2.
4.9.3.
4.9.4. PCM Multiplexing Function . 43
PCM Interface . 43
LCD Display/SPI Interface . 44
SD Card Interface. 44 4.10. Keypad Interface .45
4.10.1. Keypad Multiplexing Function. 47 4.11. I2C Bus .47
4.11.1. I2C Multiplexing Function . 48 4.12. General Purpose Input/Output (GPIO) .48
4.13. ADC .48
4.14. PWM .48
4.14.1. PWM Multiplexing Function. 49 4.15. Network Status Indication.49
4.15.1. NETLIGHT Multiplexing Function. 50 4.16. Operating Status Indication.50
4.16.1. STATUS Multiplexing Function . 51 4.17. LED Interface.51
4.18. RF Synchronization Signal .51
4.19. Antenna Interface.52
4.19.1.
4.19.2. 5. PCB Layout . 55 5.1
5.2 Pin Assignment .55
Principle of PCB layout .56 5.2.1
5.2.2.
5.2.3
5.2.4
5.2.5 5.3 6. GSM Antenna Interface . 52
FM Antenna Interface . 53 Antenna Interface . 56
Power Supply . 56
SIM Card Interface. 56
Audio Interface. 56
Others . 56 Recommended PCB Layout.57 Electrical, Reliability and Radio Characteristics . 58 6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10 Absolute Maximum Ratings .58
Recommended Operating Conditions .58
Digital Interface Characteristics.58
SIM Card Interface Characteristics.59
SIM_VDD Characteristics .59
VDD_EXT Characteristics .59
VRTC Characteristics .59
Current Consumption (VBAT=3.8V) .60
Electro-Static Discharge .61
Radio Characteristics .61 6.10.1. 6.11 Module RF Output Power. 61 Module RF Receive Sensitivity .62 SIM800L_Hardware_Design_V1.00 4 2013-08-20