NSW-5
System Module UT5U
PAMS Technical Documentation
Page 27
Issue 1 10/00
Nokia Mobile Phones Ltd.
contains the main program code for the MCU, and is able to emulate
EEPROM.
SRAM
– size 256k * 16 bit
AUDIO–RF
Audio interface and baseband–RF interface converters are integrated into
the COBBA circuit.
COBBA main features
The codec includes microphone and earpiece amplifier and all the neces-
sary switches for routing. There are two different possibilities for routing;
internal and external devices. There are also all the AD– and DA– con-
verters for the RF interface.
A slow speed DA–converter provides automatic frequency control (AFC).
In addition, there is a DA–converters for transmitter power control (TXC).
COBBA also passes the RFC (19.44 MHz) to MAD as COBBACLK (9.72
MHz).
COBBA is connected to MAD via two serial busses:
– RXTXSIO, for interfacing the RF–DACs and DEMO; and also for audio
codec and general control. Signals used: COBBACLK (9.72 MHz, from
COBBA), COBBACSX, COBBASD (bi–directional data) and COBBA-
DAX (data ready flag for rx–samples).
– Codec SIO, for interfacing the audio ADCs / DACs (PCM–samples).
Signals: PCMDCLK (data clock 1.08 MHz / 1.215 MHz), PCMSCLK
(frame sync 8.0 kHz / 8.1 kHz), PCMTxdata and PCMRxdata.
A vibra alerting device is used for giving silent signal to the user of an in-
coming call. The device is controlled with a VibraPWM output signal from
MAD. The vibra alert can be adjusted either by changing the pulse width
or by changing the pulse frequency.
PWRU
CCONT Main Features
CCONT generates regulated supply voltages for baseband and RF.
There are seven 2.8 V linear regulators for RF, one 2.8 V regulator for
baseband, one special switched output (VR1_SW), one programmable 2
V output (V2V), one 3/5 V output, one 5 V output, and one 1.5 V +/– 1.5
% reference voltage for RF and COBBA.
Other functions include:
– power up/down procedures and reset logic
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