Gps Interface; Nfc Interface - Nokia RM-779 Service Manual

RM-779
System Module

GPS interface

The phone includes an inbuilt single chip GPS receiver GPSCost5.0D, comprising both RF and BB blocks
integrated in a single digital die. GPSCost5.0D is connected to RAPU ASIC via I2C_1 and some GENIOs.
GPSCost5.0D operates in Multi-master mode and the REF clock is requested via AGPS_CLK_REQ signal connected
to RAPU genio46. REFOUT_EXT2 single ended 38.4 MHz analog clock from Linko RF is provided to GPSCost5.0D.

NFC interface

Near Field Communication (NFC) is a short-range wireless connectivity technology standard. NFC is based on
inductive-coupling, where loosely coupled inductive circuits share power and data over a distance of a few
centimeters. NFC works at 13.56 MHz frequency. The phone NFC functionality is built with NFC1.0D-a solution.
It is connected to the host processor via I2C bus. The system has also ENABLE and RESET lines from the host,
and IRQ and CLK_REQ lines to the host. NFC requires VBAT and VIO power supplies and uses 38.4 MHz reference
clock from the CMT RF circuitry. The system has an SWP connection to the SIM card for secure element
purposes. The NFC secure element feature also requires a VSIM connection from the host to the NFC engine.
Issue 1
Figure 47 GPS interface
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