Nokia NSE-3 SERIES, Service Manual

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PAMS
Technical Documentation
NSE–3
System Module
Original 11/97
Page 3 – 10
Baseband Module
Block Diagram
CCONT
UI
SIM
MAD
SYSCON
CHAPS
COBBA
BATTERY
PA SUPPLY
RF SUPPLIES
BB SUPPLY
TX/RX SIGNALS
BASEBAND
VBAT
+
MEMORIES
COBBA SUPPLY
AUDIOLINES
IR
32kHz
CLK
13MHz
CLK
SLEEP CLOCK
SYSTEM CLOCK
Technical Summary
The baseband module consists of four asics, CHAPS, CCONT, COBBA–
GJ and MAD2, which take care of the baseband functions of NSE–3.
The baseband is running from a 2.8V power rail, which is supplied by a
power controlling asic. In the CCONT asic there are 6 individually con-
trolled regulator outputs for RF–section and two outputs for the base-
band. In addition there is one +5V power supply output (V5V) for flash
programming voltage and other purposes where a higher voltage is need-
ed. The CCONT contains also a SIM interface, which supports both 3V
and 5V SIM–cards. A real time clock function is integrated into the
CCONT, which utilizes the same 32kHz clock supply as the sleep clock. A
backup power supply is provided for the RTC, which keeps the real time
clock running when the main battery is removed. The backup power sup-
ply is a rechargable polyacene battery. The backup time with this battery
is minimum of ten minutes.