SIM5218E Hardware Design
SIM5218E_ Hardware Design_V1.06
2012.09.21
48
VREG_AUX1
Output
40
2.7
2.85
3.0
Table 26 : MMC/SD pin connector
Name
SD card
MMC card
SD_DATA0
SD_DATA0
MMC_data
SD_DATA1
SD_DATA1
NC
SD_DATA2
SD_DATA2
NC
SD_DATA3
SD_DATA3
NC
SD_CLK
SD_CLK
MMC_CLK
SD_CMD
SD_CMD
MMC_CMD
VREG_AUX
SD_VDD
MMC_VDD
Note
：
SD card interface function is supported by SIM5218E software. User can use
VREG_AUX for power supply of SD card and as the pull up power for data lines.
3.18 Global Positioning System (GPS)
SIM5218E merges global positioning system (GPS) satellite and network information to provide a
high-availability solution that offers industry-leading accuracy and performance. This solution
performs well, even in very challenging environmental conditions where conventional GPS
receivers fail, and provides a platform to enable wireless operators to address both location-based
services and emergency mandates.
3.18.1 GPS modes
SIM5218E supports both A-GPS and S-GPS and provides three operating modes: mobile-assisted
mode, mobile-based mode and standalone mode. A-GPS includes mobile-assisted and
mobile-based mode.
In mobile-assisted mode, when a request for position location is issued, available network
information is provided to the location server (e.g., Cell-ID) and assistance is requested from the
location server. The location server sends the assistance information to the handset. The
handset/mobile unit measures the GPS observables and provides the GPS measurements along
with available network data (that is appropriate for the given air interface technology) to the
location server. The location server then calculates the position location and returns results to the
requesting entity.
In mobile-based mode, the assistant data provided by the location server encompasses not only the
information required to assist the handset in measuring the satellite signals, but also the
information required to calculate the handset’s position. Therefore, rather than provide the GPS
