Nokia Mobile Phones NSE-5 Series Service Manual page 67

PAMS
Technical Documentation
DC Regulators
The transceiver has a multi function power management IC, which
contains among other functions 7 pcs of 2.8 V regulators. All regulators
can be controlled individually with 2.8 V logic directly or through a control
register. However, in the chosen configuration of the CCONT, direct
control is only used with VR1. The control register is used to switch off the
regulators when they are not in use.
The CCONT also provides a 1.5 V reference voltage for the SUMMA. This
reference voltage is used for the DACs and ADCs in the COBBA too.
The use of the regulators can be seen in the Power Distribution Diagram.
BATTERY
CtrlReg1
D0
0
>=1
0
0
VCXOPWR
VR
1
VCTCXO
VXO VRX_1
CRFU3
LO_BUF
RX/TX/SYN
VSYN_2
Issue 1 07/99
Ñ
PA
RFReg
D1 D3 D4
Ñ Ñ Ñ Ñ Ñ
VR VR VR
2 4 5
CRFU3 SUMMA
RX RX
VRX_2
Ñ
SUMMA
PLL's
VSYN_2
Figure 15. Power Distribution
Ñ
Serial
Interface
D6
CCONT–ASIC
VR VR
V5V
7 REF
Ñ
Ñ
SUMMA
VREF
CRFU3 SUMMA
SUMMA CHARGE
TX PUMPS
VTX VCP
NSE–5
System Module
VBATT
DATA_CLK
DATASELX
DATA_IN/OUT
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