Nokia 252 Baseband Block

After Sales Technical Documentation

NHA–5 Series Transceivers

Chapter 3

Baseband Block

Original 51/96

NHA–5

After Sales

Baseband Block

CONTENTS

Baseband Block Description 3 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . .

Circuit Description 3 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Microcontroller 3 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input/Output Ports of MCU 3 – 4. . . . . . . . . . . . . . . . . . . . . . . .

A/D Converter of MCU 3 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

MCU SLEEP Mode Operation 3 – 10. . . . . . . . . . . . . . . . . . . . .

Audio 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NASTA RX Signal Paths 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . .

NASTA TX Signal Paths 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . .

User Interface 3 – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power 3 – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Circuit Operation 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . .

MBUS Hardware Description 3 – 14. . . . . . . . . . . . . . . . . . . . . . . .

ESN Description 3 – 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Documentation

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Technical Documentation

Baseband Block Description

Circuit Description

The module consists of following main components:

– H8/3047 16–bit single chip microcontroller with 96 kbytes ROM

(EPROM) and 4 kbytes RAM
– NASTA modem and audio ASIC
– External audio amplifier with on/off control and buzzer driver circuit
– MUUMI power supply (and control), ASIC and discrete charge switch

control logic
– serial I2C–bus 2 kbytes EEPROM with 16 bytes one time program-

mable electrical serial number (ESN) area
– NJU6428 LCD controller with 2* VL negative voltage generation is lo-

cated in the separate display module

Baseband Block

The baseband block diagram illustrates the baseband module connec­tions and interface to charger, battery and display module.

Microcontroller

NHA–5 microcontroller is a H8/3047 that is operating in single–chip ad­vanced mode (mode 7) 96 kbyte address space. The MCU operating
clock (=2.4 MHz) is generated on NASTA.

Microcontroller includes 2 serial channels, 5 pcs 16–bit timer units(ITU)
with PWM and interval capability, 10–bit A/D–converter with 8 channels,
watchdog timer and refresh timer. Serial channel 0 is used for asynchro­nous M2BUS–communication and channel 1 is used for synchronous
synthesizer interface. Four timer units are used for pulse width modula­tion (PWM) outputs: buzzer control(BUZZ_DRIVE) ITU0, charge control
(CSWPWM) ITU1, TX power control (TXC) ITU2 and vibrating battery
control ITU3. M2BUS net free interrupt reserves one timer unit ITU4. Key­board interface reserves 10 I/O–lines: 4 column outputs (COL3–0) and 6
row inputs. Different power on/off switch is connected through MUUMI cir­cuit to MCU input PWRON.

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After Sales

Baseband Block

Input/Output Ports of MCU

All input/output pins are used as I/O–ports. NASTA address and data bus
is connected to I/O–pins.

Port 1

Pin name Pin use description
P10/A0 NA0, NASTA address bus ,output

P11/A1 NA1, NASTA address bus ,output
P12/A2 NA2, NASTA address bus ,output
P13/A3 NA3, NASTA address bus ,output
P14/A4 NCS
P15/A5 NRD, NASTA read control output
P16/A6 NWR
P17/A7

Port 2

Technical Documentation

, NASTA chip select control output

, NASTA write control output

Port 3

Pin name Pin use description
P20/A8 ROW0, Keyboard matrix row input 0 (input pullup used)

P21/A9 ROW1, Keyboard matrix row input 1 (input pullup used)
P22/A10 ROW2, Keyboard matrix row input 2 (input pullup used)
P23/A11 ROW3, Keyboard matrix row input 3 (input pullup used)
P24/A12 ROW4, Keyboard matrix row input 4 (input pullup used)
P25/A13 ROW5, Keyboard matrix row input 5 (input pullup used)
P26/A14 PWRON, buffered power on key input (=1 when PWR–

key pressed)

P27/A15 LIGHTS, Keyboard and display illumination on/off=1/0

control output

Pin name Pin use description
P30/D8 ND0, NASTA data bus,I/O

P31/D9 ND1, NASTA data bus,I/O
P32/D10 ND2, NASTA data bus,I/O
P33/D11 ND3, NASTA data bus,I/O
P34/D12 ND4, NASTA data bus,I/O
P35/D13 ND5, NASTA data bus,I/O
P36/D14 ND6, NASTA data bus,I/O
P37/D15 ND7, NASTA data bus,I/O

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After Sales

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Technical Documentation

Port 4

Pin name Pin use description
P40/D0 SLE, Synthesizer latch enable

P41/D1 unused output
P42/D2 TXE, Transmitter regulator on/off=1/0 control
P43/D3 TXS, Transmitter synthesizer on/off control
P44/D4 RXV0, RX VCO aligning output
P45/D5 RXV1, RX VCO aligning output
P46/D6 RXV2, RX VCO aligning output
P47/D7 SLD, synthesizer lock detect input, internal pullup used

Port 5

Pin name Pin use description
P50/A16 COL0, Keyboard column output 0

P51/A17 COL1, Keyboard column output 1
P52/A18 COL2, Keyboard column output 2
P53/A19 COL3, Keyboard column output 3

Baseband Block

(pullup used, when input)
(pullup used, when input)
(pullup used ,when input)
(pullup used ,when input)

Port 6

Pin name Pin use description
P60/WAIT DB0, LCD controller data bus,I/O

P61/BREQ DB1, LCD controller data bus,I/O
P62/BACK
P63/AS
P64/RD E, LCD controller bus enable control output
P65/HWR R/W, LCD controller bus read/write control output
P66/LWR RS, LCD controller register select control output

DB2, LCD controller data bus,I/O
DB3, LCD controller data bus,I/O

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