User Guide

PAMS
Technical Documentation
NSB–1
System Module
Original 06/98
Page 3 – 18
The regulator is selectable between 3V and 5V and controlled by the
SIMPwr line from MAD to CCONT. SIM card regulator is also used for af-
ter sales flash programming. COBBA analog parts are powered from a
dedicated 2.8V supply VCOBBA by the CCONT. The CCONT supplies
also 5V for RF. 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 rechargeable polyacene battery.
CCONT includes also six additional 2.8V regulators providing power to
the RF section. These regulators can be controlled either by the direct
control signals from MAD or by the RF regulator control register in
CCONT which MAD can update. Below are the listed the MAD control
lines and the regulators they are controlling.
– TxPwr controls VTX regulator (VR7)
– RxPwr controls and VRX regulators (VR2 and VR5)
– SynthPwr controls VSYN_A and VSYN_D regulators (VR4 and VR3)
– VCXOPwr controls VXO and VCOBBA regulators (VR1 and VR6)
CCONT generates also a 1.5 V reference voltage VREF to COBBA,
PLUSSA and CRFU. The VREF voltage is also used as a reference to
some of the CCONT A/D converters.
In addition to the above mentioned signals MAD includes also TXP con-
trol signal which goes to PLUSSA power control block and to the power
amplifier. The transmitter power control TXC is led from COBBA to PLUS-
SA.
Regulator Max.current Unit Vout Unit Notes
VR1 25 mA 2.8 V VVCXO
VR2 25 mA 2.8 V VDET
VR3 50 mA 2.8 V VSYN_D
VR4 90 mA 2.8 V VSYN_A
VR5 80 mA 2.8 V VRX
VR6 100 mA 2.8 V COBBA
VR7 150 mA 2.8 V VTX .Depends on exter
nal BJT
V2V 50 mA 1.3 –
2.65
V MAD core voltage, in
225mV steps (1.975V
default)
VBB ON
VBB SLEEP
125
1
mA
mA
2.8
2.8
V current limit 250mA
current limit 5mA
VSIM 30 mA 3.0/
5.0
V VSIM output voltage
selectable,Used also for
flashing. (VPP)
V5V 30 mA 5.0 V for RF