Nokia NSB-5 Series Technical Documentation Manual page 21

PAMS Technical Documentation
VCOBBA by the CCONT. There is a separate regulator for a SIM card which is selectable
between 3V and 5V and controlled by the SIMPwr line from MAD2WD1 to CCONT.
The CCONT contains a real time clock function, which is powered from a RTC backup
when the main battery is disconnected. The RTC backup is rechargable polyacene battery.
CCONT includes also six additional 2.8V regulators providing power to the RF section.
These regulators can be controlled by the seriel interface from MAD2WD1; i.e., RF regu-
lator control register in CCONT which MAD2WD1 can update.
CCONT supplies a core voltage to the MAD2WD1. The core voltage is by default 1.975V,
but can be set lower, depending on the MAD2 silicon technology.
RAM_BCK is not used.
CCONT generates also a 1.5 V reference voltage VREF to COBBA_GJP, SUMMA. The VREF
voltage is also used as a reference to some of the CCONT A/D converters and as a refer-
ence for al the other regulators.
In addition to the above-mentioned signals, MAD2WD1 includes also TXP control signal
which goes to SUMMA power control block and to the power amplifier. The transmitter
power control TXC is led from COBBA_GJP to SUMMA.
Table 5: CCONT current output capability/nominal voltage
Maximum
Regulator
VR1
VR2
VR3/switch
VR4
VR5
VR6
VR7
VBB ON
VBB SLEEP
VSIM
V_core
V_RAM_bck/VR3
VSIM must fulfill the GSM11.10 current spike requirements.
Issue 1 03/01
Unit Vout
current
25 mA
25 mA
50 mA
90 mA
80 mA
100 mA
150 mA
125 mA
1 mA
30 mA
50 mA 1.975
50 mA
Nokia Mobile Phones Ltd.
Unit
2.8 V
2.8 V
2.8 V
2.8 V
2.8 V
2.8 V
2.8 V SUMMA+CRFU Tx
2.8 V current limit 250mA
2.8 V current limit 5mA
3.0/ V
5.0 V outout voltage selectable
V programmable core supply for CPU/
DSP/SYS ASIC dV=225V
2.8 V normal mode 2.8V. 2.0V for data
retention. (not used)
NSB-5
System Module
Notes
VCTCXO
CRFU Rx
PLL VSYN
VCO VSYN
SUMMA Rx
COBBA_GJP
VSIM
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