User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin of module
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charge interface
- 3.6. Power saving
- 3.7. Summary of state transition
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M50 Hardware Design
M50_HD_V2.0 - 61 -
Table 20: Pin name of the SD card and Micro SD card
In SD card interface designing, in order to ensure good communication performance with SD card,
the following design principles should be complied with.
Route SD card trace as short as possible. Keep total trace length < 100mm, and trace
difference of DATA0, CMD, and CLK to be < 10mm. The SD_CLK and SD_DATA0 line
must be shielded by GND in order to avoid interference.
In order to offer good ESD protection, it is recommended to add TVS on signals with the
capacitance is less than 15pF.
Reserve external pull-up resistor for other data lines except the DATA0.
Pin NO. Pin name of SD card Pin name of T-Flash(Micro SD) card
1 CD/DATA3 DATA2
2 CMD CD/DATA3
3 VSS1 CMD
4 VDD VDD
5 CLK CLK
6 VSS2 VSS
7 DATA0 DATA0
8 DATA1 DATA1
9 DATA2
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