Gps; Gps Troubleshooting - Nokia 2366i Baseband Description And Troubleshooting

Nokia Customer Care

GPS

The GPS turns on by using Vcore and VIO from the UEMCR IC. The GPS communicates
with the UPP using the UART interface, turning on the GPS engine's BB integrated circuit
and RF integrated circuit. These synchronize with the mobile terminal using the 19.2
Mhz clock. The mobile terminal computes the location coordinates from signals received
from the satellites and sends them to the emergency desk.
The GPS baseband module performs the following:
• Accepts the GPS raw data from the front end
• Processes the raw data to provide the CE with location information (2 CPUs)
• Accepts commands from the CE
• Mode (sleep, idle, etc.)
• RF control commands
• GPS configuration
• Provides power for the FPS RF

GPS Troubleshooting

Check the following connections and signals (see
• Power source Vcore and VIO
• CLK19M2_GPS = 19.2 Mhz
Issue 2 - February 2007
Baseband Description and Troubleshooting
System Clock
Secondary UARD
19.2 MHz (CDMA)
(Diagnostic)
Figure 5: GPS Block Diagram
Company Confidential
2366i (RM-155)
Figure 6):
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