HELLA and KGaA 009066T Transmitter 5FA 009 066-30 User Manual

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Document ID	514032
Application ID	IIQCh7ML3cTKKoZx0+s6Sg==
Document Description	Users Manual
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
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Filesize	26.83kB (335420 bits)
Date Submitted	2005-02-10 00:00:00
Date Available	2005-02-10 00:00:00
Creation Date	2005-01-19 11:05:11
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Document Lastmod	2005-01-19 11:06:28
Document Title	Microsoft Word - Annex No 5 Key; 5FA 009 066-30_Technical description, User…
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Document Author:	Manfried Dudde

Annex No.5
Technical Description
Users Manual
Key: 5FA 009 066-30
Hella KGaA Hueck & Co
59552 Lippstadt
Function description
PLL radio remote control transmitter
5FA 009 066 – 30
2004-11-02
Amend. date
Date:
2004-11-02
All
Amend. No.
New document
Page
Processed: K. Bödeker EE-324
Replacement for version dated :
EE-324 Bödeker
Amendment
Checked:
Gr./Name/Chkd.
Function Description 5FA00906630_Eng_041102.doc
Page 1 of 3
Hella KGaA Hueck & Co
59552 Lippstadt
1 Circuit Description
Atmel´s integrated circuit ATAR862 is the central construction element of the radio remote control transmitter. This IC is a
single-package fully integrated 4-bit mask-ROM microcontroller with PLL-RF-transmitter. As an alternative the pin- and
function- compatible IC T48C862 may be used which contains a Flash-ROM programmable microcontroller.
ATAR862´s integrated microcontroller is the same as the stand-alone device ATAR892, and the integrated PLL-transmitter is
similar to the stand-alone-device T5753. PLL-Transmitter and microcontroller are placed into a single IC-package as separate
dies without any internal electrical connection. The following figure 1 shows a block diagram of the radio transmitter´s
electronic circuit.
Data
S1: unlock button
uC
S2: lock button
S3: tailgate release but.
On / off
Clock
RFtransmitter
S4: panic alarm button
ATAR862
Voltage supply
3V
LED
Crystal 9,84375 MHz
Figure 1: Block diagram of the transmitter´s electronic circuit
Four push-buttons S1 to S4 and LED D1 act as interface to the user.
The microcontroller is responsible for monitoring the button signals, monitoring the power supply, encryption and encoding
of the transmit data and control of RF-telegram transmission.
An integrated EEPROM serves as a storage device for transmitter-specific data.
The transmitter´s power supply comes from a lithium coin-cell battery CR2032. The nominal value of the supply voltage is
3 volts. Capacitor C2 blocks the supply voltage for the microcontroller part of IC1.
By pressing buttons S1 to S4 logic-high level is applied to the microcontroller´s inputs BP50, BP52, BP53 or BP63.
Pulldown resistors R1 to R4 are actually not mounted because all button inputs of IC1 have internal pulldown elements for
termination to logic-low level. Resistors R7 and R8 are used for decoupling of the connection between the push buttons S1
and S2 from the board antenna structure. The microcontroller´s output port BP20 drives the LED D1 via Resistor R5.
Switcing on and off the PLL circuit of IC1 is done by means of output port BP23, whereas the modulation signal is supplied
to the PLL-transmitter via output port BP42.
Capacitors C1, C4 and C11 are used for decoupling of the transmitter´s supply voltage.
The PLL-part of IC1 contains a crystal oscillator circuit with Q1 and C3 as frequency determining elements. The oscillator´s
output signal is used as a reference for the transmitter´s PLL-circuit and for clocking the microcontroller via an integrated
4:1-frequency-divider.
The PLL loop-filter is fully integrated into IC1.
The transmitter´s output stage is switched on and off via input PA_ENABLE. Thus the transmitted signal is OOK-modulated
with the data supplied by the microcontroller via output port BP42.
An on-board resonant loop antenna is used to radiate the output signal of the transmitter circuit. Capacitors C5 and C6
determine the resonance frequency of the antenna, whereas C7, L2 and C10 are used for lowpass-filtering of the transmitters´s
output signal. L1 serves as a DC-path to the transmitter´s output stage.
Date:
2004-11-02
Processed: K. Bödeker EE-324
Replacement for version dated:
Checked:
Page 2 of 3
Hella KGaA Hueck & Co
59552 Lippstadt
2 General Function
While none of the buttons is pressed, the microcontroller is in sleep mode and the transmitter´s RF stage is disabled. Pressing
any of the buttons S1 to S4 wakes up the microcontroller. At this time an integrated RC-oscillator is used as the
microcontroller´s clock source. The crystal oscillator and the PLL circuit will now be switched on via BP23. At the end of a
short stabilisation phase the clock source for the microcontroller is switched from the RC-oscillator to the output of the
integrated 4:1 frequency-divider. Message Data is fed from the microcontroller to the power amplifier via output port BP42
thus modulating the RF-carrier in OOK-Mode. After all buttons have been released, transmission will stop and the PLLcircuit is disabled by switching off output port BP23. The microcontroller returns to the sleep-mode again.
3 Technical data
Model designation
5FA 009 066–30
Supply Voltage
Current consumption
Buttons
Function
Unlock
S1
Lock
S2
Tailgate remote release
S3
Panic alarm
S4
3V nominal (1 Lithium coin cell)
approx. 8 mA
Operating frequency
Frequency synthesis
PLL reference frequency
Modulation scheme
Type of transmission (ITU Designation)
Moduation data rate
Signal strength
Operating temperature range
Antenna
315,0 MHz ± 100 ppm
Quartz crystal stabilized PLL
9.84375 MHz
Pulse Modulation (OOK)
A1D / simplex
approx. 1,7 Kbit / s
max. 6mV/m @ 3m
-20°C ... +60°C
integrated PCB loop antenna
Date:
2004-11-02
Processed: K. Bödeker EE-324
Replacement for version dated:
Checked:
Page 3 of 3


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