After Sales Technical Documentation
Handset HSE–1
Original 50/96
NMP Part No. 0275277
After Sales
Handset HSE–1
CONTENTS
Technical Documentation
Page – 2
Original 50/96
After Sales
Technical Documentation
Handset HSE–1
Related Documentation
Introduction
Handset HSE–1
0200149 circuit diagram
D 0000111 block diagram
4F 9853821 layout and foil diagrams
6E 0200149 parts list
S 0640002 exploded view (HSE–1/1M)
S 0640038 exploded view (HSE–1XM/1XK)
6E 0260008 assembly parts (MHSE1)
6E 0260137 assembly parts (MHSE1M)
6E 0260156 assembly parts (MHSE1XM)
6E 0260212 assembly parts (MHSE1XK)
The HSE–1/1M/1XM/XK Handset has two main functions: to form an electroacoustic interface between the user and the transceiver unit and to
provide means for controlling the transceiver unit and other accessories.
The HSE–1/1M/1XM/XK is divided into two parts: the EH8M electronics
module and the MHSE1/1M/1XM/1XK mechanics. The EH8M module
consists of an 8–bit microprocessor with internal memory, a 2x8 character
display (+ 2 seven–segment) with one driver IC, keyboard, earphone, microphone, loudspeaker and corresponding amplifiers.
The MHSE1/1M/1XM/1XK Mechanics consist of the A–cover (front),
B–cover (rear), keyboard rubber mat, coiled cord, display frame and a
number of smaller parts.
The HSE–1/1M/1XM/1XK is designed for single–handset systems and for
mobile use only,so it has no audio switches, and is not provided with functions for a power–safe or sleep mode.
Technical Specifications
Mode of Operation
The HSE–1/1M/1XM/1XK has only one mode of operation, used when the
handset is operating as a combined handset and control unit. There is no
need for a local mode because all testing can be done by means of
M2BUS–messages.
External Signals and Connections
The HSE–1/1M/1XM/1XK has an 8–pin connector for connection to the
junction box, system cable and transceiver via coiled cord.
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Handset HSE–1
Signal names and basic interface connections:
Pin Name Level Comments
1 VBS typ. 13.2 V
2 DGND Digital ground
3 MBUS Input: ”0”< 0.9 V Input levels at processor
4 LSP max. 4 V
5 POWER Series diode dropout 0.7 V
6 AGND Analog ground
7 MIC max. 2 V
8 EAR max. 1.2 V
Technical Documentation
min. 10.0 V
max. 17.0 V
”1”> 1.9 V input/RxD
Output: ”0”< 0.5 V Max allowed capacitance 2 nF
rms
rms
rms
No DC connection
DC 0.0 V
Display Specifications
The HSE–1/1M/1XM/1XK has a 2x8 (5x7) dot matrix display for 2 seven–
segment characters, a signal strength indicator (left bar) and a number of
fixed indicators over and under the character lines.
The yellow–green supertwist liquid crystal display is connected to the pcb
by means of elastomer connectors. The display is illuminated with green
LEDs from both sides.
Technical specifications for the display are as follows:
Display type Yellow–green supertwist lcd, transflective
Illumination colour yellow–green LED
Driving mode MUX 1:16, 1/5–bias
Driving voltage 7.5 V at +25°C
Temp. compensation 30 mV/°C
Lens thickness 1.1 mm
Display driver NEC µPD7228AG
Storage temperature –30...+85°C
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Oper. temperature –25...+70°C
Humidity typ. 50% RH max. 90% RH
Response times t(
) < 100 ms (+25°C) < 1500 ms (–25°C)
rise
) < 100 ms (+25°C) < 1500 ms (–25°C)
t(
fall
Viewing angle min. 40 degrees to all sides from centre
line (CR 2:1)
Main viewing direction 12 o’clock
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After Sales
Technical Documentation
Functional Description
Functional Blocks
HSE–1/1M/1XM/1XK Handset consists of the following functional blocks:
– Audio circuit
– Microprocessor
– Keyboard matrix
– Keyboard illumination
– Display controller/driver
– Voltage converter
– LCD display
– Display illumination
Handset HSE–1
The Audio circuit consists of the earphone and the microphone and corresponding amplifiers.
The Handset loudspeaker is connected direct to the EXTS line. The Microprocessor is a single chip version with internal ROM and RAM. The
microprocessor controls all other blocks.
The Keyboard matrix is connected directly to microprocessor inputs and
outputs.
Keyboard illumination is accomplished with LEDs and is switched on, off
or dimmed by the microprocessor.
The Display controller/driver is connected to the microprocessor over a
parallel data line, and contains a display data RAM and character generator ROM/RAM.
The Voltage converter converts the voltages of +5V to –5V and divides
the voltage between +5V and –5V to five levels (V1...V5), which are connected to the display controller/driver.
The LCD display is connected to pcb and display drivers over two elastomer connectors.
The Display illumination is of the same type as the keyboard illumination.
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Handset HSE–1
Circuit Description
General
The user interface of the handset is of the menu type. Alphabetical characters can be used. A dot matrix display is provided.
Construction
The handset consists of two body halves with a PC board inserted in between. A coiled cord, a speaker, an earphone and a microphone are
wired to the PC board.
Handset Module
The HSE–1/1M/1XM/1XK handsets consist of the following functional
blocks:
1. microphone amplifier
Technical Documentation
2. earphone amplifier
3. loudspeaker
4. CPU with peripherals
5. Hook indicator
6. M2BUS electronics
7. LCD display
8. display controller/driver
9. keyboard matrix
10. illumination
11. voltage supply
12. power on/off logic
13. oscillators
Microphone Amplifier
Transistor V35 supplies a bias voltage for microphone B3. The supply is
filtered by C31, R69 and R70. The supply voltage on the emitter of transistor V35 is about 4.9 volts.
The frequency response of the microphone is filtered to obtain a suitable
shape by low pass filters C10/R60 and R10/R11/C11/C12/C14/R8 and
high pass filter R9/C13. The amplification is about 29 dB with a 1 kHz signal.
Earphone Amplifier
The Earphone amplifier is of the differential type. Total amplification is
about 10 dB. The reference voltage is 4.3 volts in order to get a maximum
peak voltage without distortion.
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Technical Documentation
Loudspeaker
The loudspeaker (8 Ω / 2 W) is connected direct to the coiled cord. It is
used to produce the keypad and alarm tones.
CPU with Peripherals
Microprocessor D1 is a single chip version with internal ROM and RAM. It
has 8 kbytes of ROM and 256 bytes of RAM. It controls the other blocks
on the basis of information coming from the M2BUS. In addition, it reads
the user inputs, and sends them to the M2BUS.
HOOK Indicator
On–hook/off–hook information is received from a reed relay, which is located on the PC board and controlled by a magnet in the handset cradle.
M2BUS Electronics
Handset HSE–1
The MBUS is a serial data bus with which the handset sends messages
to, and receives them from, the radio unit. Transistor V28 sends the outgoing messages (TXD). Incoming data comes to processor pin 11 (RXD).
Net free state is controlled by software before message sending.
LCD Display
The display is a 16 symbol 5 x 7 dot matrix supertwist LCD with two
7–segment characters and a few indicators. The LCD is connected to the
PCB by two elastomer connectors. The multiplexing ratio is 1:16.
Display Controller/Driver
The Display controller/driver is connected to the microprocessor by a parallel (4 bit) data line, and contains display data RAM and character generator ROM/RAM. All other characters are created by the processor ROM.
There is reserved a memory location for one character in RAM, loaded by
a M2BUS message.
Resistors R35...R40, R42 and R88 comprise a resistor network from
which the LCD driving voltages are received. The voltage between +5 V
and – 5 V is divided to five levels which are applied to the display driver.
R41 provides temperature compensation (about 10 mV/ °C).
Keyboard Matrix
Keyboard has a 3 x 8 line matrix. Four of the eight write lines are used in
common with display driver data lines. A diode in each of these lines prevents any contention in data lines when two or more keys are depressed
at the same time.
The keyboard and the display are illuminated by LEDs. They are separately switched on, off or dimmed by the microprocessor. All illumination
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Handset HSE–1
LEDs draw a constant current of 20 mA, or 13 mA when dimmed. Variations in supply voltage (within the limits of the specifications) therefore do
not have any effect on the brightness of the illumination.
The keyboard is lit by 22 LEDs. There is one illumination LED for each
button.
The display is lit by six LEDs V9...V14 (three in series). The LEDs are located on the PC board at the ends of the plastic display light conductor.
The light conductor is beneath the display.
Voltage Supply
The handset receives the battery voltage of the radio unit (about 12 V).
This voltage is fed to the LEDs and the voltage regulators. There is an
eight volt regulator N2 for audio circuits and a five volt regulator, N1, for
the logic.
The analog 8V supply from regulator N2 is divided to 4.3 volt by resistors
R4 and R9 and buffered by op.amp. N3, connected as voltage follower to
get the reference voltage for the audio amplifiers.
Technical Documentation
The negative five volt supply for the display driver is created by diode V29
and capacitors C17 and C24. The drive frequency is produced by the oscillator block, then buffered by inverter D3.
To avoid audio disturbances, ground potentials are separated between
the analog and digital parts. AGND is the analog ground where the
ground current is almost zero. DGND is the ground for the digital circuits
and circuits which use more power (loudspeaker, LEDs).
Power on/off Logic
The power on/off switch is located on the keyboard (but not in the matrix).
The radio unit detects the depression of the power button and turns power on. When the button is pressed while power is on, the microcontroller
of the handset detects it and sends a M2BUS message to the radio unit.
The radio unit detects the duration of the key depression; if it is more than
0.5 seconds, will turn power off.
Oscillators
The clock frequency of 7.3728 MHz for the microcontroller is generated
by crystal oscillator B4. In order to eliminate harmonic frequencies resistor R2 and capacitor C32 are added.
The oscillator for the display driver and the negative five volt generator
comprises inverter D3, resistors R33 and R34 and capacitor C18. The frequency is about 200 kHz.
Handset Processor Gates
Gate Pin I/O State Function
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After Sales
Technical Documentation
T2 2 O keyboard illumination
T2XE 3 O display illumination dimming
EC1 4 I HOOK
CEX0 5 O reset
CEX1 6 O chip select
CEX2 7 O command/data
CEX3 8 O clock
CEX4 9 I busy
RXD 11 I M2BUS input
TXD 13 0 M2BUS output
INT0 14 I power switch
INT1 15 O keyboard illumination dimming
Handset HSE–1
*
)
*
) display driver
*
) control signals
*
)
*
)
T0 16 O display illumination dimming
T1 17 NC not connected
WR 18 O power indication
RD 19 I unit code
A8–10 24–26 I keyboard polling (read)
A11 27 O Data *) NMT indicators
(only in NMT versions)
A12 28 O Roam *)
A13 29 O Call *)
A14 30 O Serv *)
A15 31 O Hands Free *)
A7–0 36–43 O keyboard polling (write)
A7–4 36–39 O keyboard polling (write) or data to
LCD driver
A3–0 40–43 O keyboard polling (write)
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Handset HSE–1
Block Diagram of HSE–1
ACCESSIBLE VIA EDMS
Technical Documentation
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Circuit Diagram of EH8M Module
Handset HSE–1
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Handset HSE–1
Layout and Foil Diagrams of EH8M
ACCESSIBLE VIA EDMS
Technical Documentation
Page – 12
Original 50/96
After Sales
Technical Documentation
Layout and Foil Diagrams of EH8M
Handset HSE–1
Original 50/96
Page – 13
After Sales
Handset HSE–1
Technical Documentation
Parts List of EH8M (Version 1.0) Code 0200149
ITEM CODE DESCRIPTION VALUE TYPE
Handset HSE–1 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documentation – 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode of Operation – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Signals and Connections – 3. . . . . . . . . . . . . . . . . . . .
Display Specifications – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Blocks – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Construction – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handset Module – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microphone Amplifier – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Earphone Amplifier – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loudspeaker – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU with Peripherals – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HOOK Indicator – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M2BUS Electronics – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD Display – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Controller/Driver – 7. . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard Matrix – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Supply – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power on/off Logic – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oscillators – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handset Processor Gates – 8. . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram of HSE–1 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Diagram of EH8M Module – 11. . . . . . . . . . . . . . . . . . . . . . .
Layout and Foil Diagrams of EH8M – 12. . . . . . . . . . . . . . . . . . . . .
Layout and Foil Diagrams of EH8M – 13. . . . . . . . . . . . . . . . . . . . .
Parts List of EH8M (Version 1.0) Code 0200149 – 14. . . . . . .
Exploded View of HSE–1/1M – 19. . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly Parts of HSE–1/1M – 19. . . . . . . . . . . . . . . . . . . . . . . . . .
Exploded View of HSE–1XM/1XK – 20. . . . . . . . . . . . . . . . . . . . . . .
Assembly Parts of HSE–1XM/XK – 20. . . . . . . . . . . . . . . . . . . . . . .
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Exploded View of HSE–1/1M
Handset HSE–1
Assembly Parts of HSE–1/1M
ITEM Q’TY CODE DESCRIPTION VALUE, TYPE
1 9450015 Front cover 1D 21067
2 9450014 Bottom cover 1D 21068
3 Spare part combination
4 9790016 Keypad HSE–1 3D 21427
5 9204295 Logo plate ”Nokia” 4D 21063
6 9457016 Display lens 4D 21151
7 7100410 Coil cord 3C 21414
8 6293003 PT–screw KB 30x14 WN1442
FEZN
9 9370080 Type label HSE–1 4D 21150 Finland
9 9370127 Type label HSE–1 4D 21435 Germany
12 9450013 Volume button 2D 21137
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Exploded View of HSE–1XM/1XK
Technical Documentation
Assembly Parts of HSE–1XM/XK
ITEM Q’TY CODE DESCRIPTION VALUE, TYPE
1 9450154 Front cover 1D 21951
2 9450155 Bottom cover 1D 21068
3 Spare part combination
4 9790035 Keypad HSE–1XM 3D 22178
5 9430030 Logo plate ”Mobira” 4D 22185
6 9450153 Display lens 4D 22184
7 7100410 Coil cord 3C 21414
8 6293003 PT–screw KB 30x14 WN1442
FEZN
9 9370190 Type label HSE–1XK 4D 22469
9 9370176 Type label HSE–1XM 4D 22464
12 9450013 Volume button 2D 21137
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Handset HSE–1
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