User Guide

PAMS Technical Documentation System Module
NSB-5
Issue 1 03/01 Nokia Mobile Phones Ltd. Page 21
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.
VSIM must fulfill the GSM11.10 current spike requirements.
Table 5: CCONT current output capability/nominal voltage
Regulator
Maximum
current
Unit Vout Unit Notes
VR1 25 mA 2.8 V VCTCXO
VR2 25 mA 2.8 V CRFU Rx
VR3/switch 50 mA 2.8 V PLL VSYN
VR4 90 mA 2.8 V VCO VSYN
VR5 80 mA 2.8 V SUMMA Rx
VR6 100 mA 2.8 V COBBA_GJP
VR7 150 mA 2.8 V SUMMA+CRFU Tx
VBB ON
VBB SLEEP
125
1
mA
mA
2.8
2.8
V
V
current limit 250mA
current limit 5mA
VSIM 30 mA 3.0/
5.0
V
V
VSIM
outout voltage selectable
V_core 50 mA 1.975 V programmable core supply for CPU/
DSP/SYS ASIC dV=225V
V_RAM_bck/VR3 50 mA 2.8 V normal mode 2.8V. 2.0V for data
retention. (not used)