Sim800 hardware design v1.05
Table Of Contents
- Version History
- 1. Introduction
- 2. SIM800 Overview
- 3. Package Information
- 4. Application Interface
- 4.1. Power Supply
- 4.2. Power on/down SIM800
- 4.3. Power Saving Mode
- 4.4. RTC Backup
- 4.5. Serial Port and USB Interface
- 4.6. RI Behaviors
- 4.7. Audio Interfaces
- 4.8. Bluetooth
- 4.9. SIM Card Interface
- 4.10. PCM Interface
- 4.11. Keypad Interface
- 4.12. I2C BUS
- 4.13. General Purpose Input/Output (GPIO)
- 4.14. ADC
- 4.15. PWM
- 4.16. Network Status Indication
- 4.17. Operating Status Indication
- 4.18. KPLED
- 4.19. RF Synchronization Signal
- 4.20. Antenna Interface
- 5. PCB Layout
- 6. Electrical, Reliability and Radio Characteristics
- 6.1 Absolute Maximum Ratings
- 6.2 Recommended Operating Conditions
- 6.3 Digital Interface Characteristics
- 6.4 SIM Card Interface Characteristics
- 6.5 SIM_VDD Characteristics
- 6.6 VDD_EXT Characteristics
- 6.7 VRTC Characteristics
- 6.8 Current Consumption (VBAT=4V)
- 6.9 Electro-Static Discharge
- 6.10 Radio Characteristics
- 6.11 Module RF Receive Sensitivity
- 6.12 Module Operating Frequencies
- 7. Manufacturing
- 8. Appendix
Smart Machine Smart Decision
4.10.2. PCM Interface
Refer to the following figure for PCM design:
Figure 36: PCM reference circuit
4.10.3. LCD Display/SPI Interface
SIM800 provides a serial interface. It could be used as SPI interface in the embedded AT application. For details
about embedded AT application, please refer to document [1].
Refer to the following figure for SPI design:
DISP_D/C
DISP_CS
SPI_D/C
SPI_CS
SPI_CLK
DISP_CLK
SPI_DATA
DISP_DATA
GND
GND
Figure 37: LCD reference circuit
Note: This function is not supported in the standard firmware. If user wants this function, the firmware must
be customized. Please contact SIMCom for more details.
SIM800_Hardware Design_V1.05 43 2014-03-25