Nokia 282 System Module Schematics
Programmes After Market Services
NHA–9 Series Transceivers
Chapter 3
System Module
Issue 2 03/00
NHA–9
System Module
Technical Documentation
CONTENTS
Baseband Circuit Description 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Signals 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMSA_Dig System ASIC D400 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMSA_Dig D400 signals 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microcontroller D401 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microcontroller D401 signals 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EEPROM D401 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Regulation 3–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHAOS2 ASIC N6 and charging control 3–10. . . . . . . . . . . . . . . . . . . . . . .
RF Circuit Description 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAMS
Page No
Receiver 3–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rx Synthesizer 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rx loop filter 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rx VCO 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tx synthesizer 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 3–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UI 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Signals and Connections 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Signals 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keypad Module – Version 1 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keymat Module – Version 2 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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PAMS
NHA–9
Technical Documentation
System Module
List of Figures
Figure 1. Baseband Block Diagram 3–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2. RF Block Diagram 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3. UI Module Block Diagram 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4. Keypad Module Block Diagram 3–18. . . . . . . . . . . . . . . . . . . . . . . . . . .
System Diagram A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB v2_2
Baseband Block A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU A–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PSU A–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Asic A–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Block A–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page No
TX Block A–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RX Block A–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS Component Layout/Grid Ref. ( Bottom) A–9. . . . . . . . . . . . . . . . . . . . . . .
AMPS Component Layout/Grid Ref. ( Top) A–10. . . . . . . . . . . . . . . . . . . . . . . . . .
NAMPS Component Layout/Grid Ref. ( Bottom) A–11. . . . . . . . . . . . . . . . . . . . .
NAMPS Component Layout/Grid Ref. ( Top) A–12. . . . . . . . . . . . . . . . . . . . . . . . .
PCB v4_0
AMPS Component Layout/Grid Ref. ( Bottom) A – 13. . . . . . . . . . . . . . . . . . . . . . .
AMPS Component Layout/Grid Ref. ( Top)) A – 14. . . . . . . . . . . . . . . . . . . . . . . . .
Note: Positional changes in AMPS only, for schematics refer to version 2_2
PCB v11_1
Baseband Block A –15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU A –16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PSU A –17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ASIC A –18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF A –19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TX A –20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RX A –21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS Component Layout (Bottom) A –22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS Component Layout (Top) A –23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NAMPS Component Layout (Bottom) A –24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NAMPS Component Layout (Top) A –25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note: In printed manuals all A3 drawings are located at the back of the binder
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System Module
PAMS
Technical Documentation
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Technical Documentation
Baseband Circuit Description
The audio/logic unit consists of 4 ICs: AMSA_Dig baseband system ASIC
D400, MCU D401, EEPROM D402, and CHAOS2 charger switch ASIC
N6. These ICs together with the supporting discrete circuitry make up the
Baseband block.
Internal Signals
Table 1. Baseband / RF interface signals
Control signal Description
VBATT Battery supply voltage
GND Battery ground connection
PAC Filtered PWM power control signal for the transmitter
PAEN Power amplifier enable
VTX Regulated dc voltage for the low power transmitter stages
TXI Indicates when RF is present at the output of the transmitter
System Module
SynthENX Enables extended standby mode
VRX Regulated dc voltage for the receiver
FSEL Selects AMPS/NAMPS 2nd IF filtering
RSSI Received signal strength indication
RXAF Received audio and data
IF2 2nd IF providing input to the AFC loop
LNABOOST Linearises the LNA in transmit mode
SYNDATENX Serial data enable for the synthesiser
SYNDAT Serial data bus for programming the synthesiser
SYNCLK Serial data clock input for the synthesiser
LNAENX Enables the power supply to the LNA used in High signal areas
AFCDAC Voltage used to control TCXO output frequency
LOCKDET Indicates when synthesisers are in lock
TXMOD Modulation signal containing AMPS/NAMPS modulation
REFFREQ VCTCXO output used to provide baseband clock
NEGVCLK 320KHz clock for phase detector voltage doubler
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NHA–9
System Module
PAMS
Technical Documentation
Socket
Headset
Mic
Element
System ConnectorUI ConnectorKeypad
GND
XMic
HEAR
HSET_DET
Mic
GND
CHGRGND
Acc_ID
XMic
HEAR
VCH
ChrgCtrl
MBUS
VBB
LCDENX
LCDRstX
LCDCLK
LCDSDCLK_Col3
LCDSDA_Col1
LCDDC_Col0
BuzzPWM
IntEarEn
EARP
GND
VBATT
Light0
Row(0:4)
LCDSDCLK_Col3
Col2
LCDSDA_Col1
LCDDC_Col0
GND
VBATT
FNLIGHT
NUMLIGHT
Flip
position
detect
HSET_DET
LNAENX
T6
AMSA_Dig
HEAR
Filter
Audio
Button
Baseband Block Diagram
CHGRGND
I_Sense
GND
BSI
Battery
Contacts
Vibra
Contacts
VBATT
VIBRA
VBATT
RF
Vibra
VRX
Driver
VTX
LED
Drivers
Keypad
driver
indicator
Button
I_Sense
GND
VBATT
Call–alert
LNAENX
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Figure 1. Baseband Block Diagram
Issue 2 03/00
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