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
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charging interface
- 3.6. Power saving
- 3.7. Summary of state transitions
- 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
M80 Hardware Design
M80_HD_V1.2 - 62 -
3.12. SD card interface
The module provides SD card interface that support many types of memory, such as Memory
Stick, SD/MCC card and T-Flash or Micro SD card. The following are the main features of SD
card interface.
Only supports 1bit serial mode.
Does not support the SPI mode SD/MMC memory card.
Does not support multiple SD memory cards.
Does not support hot plug.
Up to 26MHz data rate in serial mode.
Up to 32GB maximum memory card capacity.
With interface features and reference circuit of SD card shown in Figure 37, the users can easily
design the SD card application circuit to enhance the memory capacity of the module. The module
can record and store the audio file to the SD card, and play the audio files in SD card as well.
Table 19: Pin definition of the SD card interface
Module
SD_DATA0
SD_CLK
SD_CMD
DATA2
DATA1
DATA0
CD/DATA3
CMD
VDD
CLK
VSS
47K
47K 47K
4.7uF 0.1nF
VDD_EXT
33R
33R
33R
Micro SD Socket
1
2
3
4
5
6
7
8
Figure 37: Reference circuit of SD card
Name
Pin
Description
SD_DATA
36
Data output and input signal of SD card
SD_CLK
35
Clock signal of SD card output
SD_CMD
34
Command signal of SD card output