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
PCM_SYNC 14 PCM synchrony
PCM_CLK 68 PCM clock
SIM800 PCM interface only supports master mode, data length is 16 bits (linear), and PCM clock rate is 256
KHz.
Table 20: PCM specification
Feature specification
Line Interface Format Linear(Fixed)
Data length 16bits(Fixed)
PCM Clock/Sync Source Master Mode(Fixed)
PCM Clock Rate 256Khz(Fixed)
PCM Sync Format Short sync/Long sync both support
Zero Padding/Sign extensi
on
Default Zero Padding
Data Ordering MSB/LSB both support
Note: User can use AT command control PCM interface, for details please refer to document [1].
4.10.1. PCM Multiplex Function
With GPIO17 and GPIO19, PCM interface can be configured as SPI or SD interface, the following table shows
the detailed multiplex function.
Table 21: PCM Multiplex Function:
Name Pin number Mode 0(default) Mode 1 Mode 2 Mode 3
PCM_OUT 6 PCM_OUT GPIO16 MC3DA3 GPIO16
PCM_IN 12 PCM_IN DISP_DATA MC3DA2 GPIO18
PCM_SYNC 14 PCM_SYNC DISP_CS MC3CK GPIO20
PCM_CLK 68 PCM_CLK GPIO12 MC3CM0 GPIO12
GPIO17 11 GPIO17 DISP_CLK MC3DA1 GPIO17
GPIO19 13 GPIO19 DISP_D/C MC3DA0 GPIO19
Note: Multiplex Function need different software version.
SIM800_Hardware Design_V1.05 42 2014-03-25