Marquardt DC10, DC11 User Manual

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Functional description

Annex No.5

Page 1 of 11

Technical Description

Remote control vehicle key

BR166

PN: B3333D (Basis)

PN: K3333D (Keyless Go)

Vehicle Key BR166 – technical Description

form 659.02

1.1 Operation of BASIC Key

1.1.1 Access permission with BASIC Key

The locking and drive permission system BR166 (3333.4/5) incorporates a function which enables the locking and unlocking of the doors. There are two separate buttons each one for lock and unlock the vehicle. All vehicles with a boot lid are equipped with a third button for unlocking the boot lid. The key is provided with a fourth button to activate the “PANIC” function for vehicles intended for the US market.

The function is activated by pushing a button, the method of button pushing determines the function activated on the vehicle, e.g. prolonged pressure on the button initiates an IR comfort function.

If messages are discharged from the key, the access permission information is sent via radio waves (HF) and redundantly via infrared (IR) from the key to the vehicle. The so-called comfort signals are special

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functions which require visual contact with the vehicle. Upon pressing the button for an extended period, these signals are sent via IR signal only after the standard access permission message.

HF communication via 3-channel operation: The access permission message is sent sequentially on 3 radio channels adjacent to one another within the

permissible ISM band. The radio receiver installed within the vehicle is able to receive the message discharged from the key on all 3 channels, evaluate it and send an appropriate control message to the central locking system.

1.1.2 Drive permission with BASIC Key

After the key is pushed into the EZS (electronic ignition switch) a cryptographically, bidirectional communication by infrared light is initiated. As there is a successful authorization of the key the engine of the vehicle can be started.

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1.2 Operation of KEYLESS GO Key

The KEYLESS Go key model is equipped with all of the BASIC model functions. Additional the KEYLESS GO model only facilitates full utilisation of the drive permission system function on

the vehicle without active operation of the key. This means that one can lock and unlock the vehicle (access permission) without operating the key and activate and deactivate the immobiliser (drive permission) without placing the key in the ignition switch. It is only necessary to carry the key in order to be identified as an authorised vehicle user.

In addition to the basic variant, the keyless go key is expanded to include an LF receiver component, comprising of inductive antennae which create the three spatial directions x, y and z, and an associated LF receiver ASIC. Additionally, the keyless go variant of the key is equipped with a special HF ASIC, which facilitates bidirectional HF communication.

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Vehicle Key BR166 – technical Description

form 659.02

1.2.1 Access permission with keyless entry

The keyless access permission (keyless entry) is initiated by the vehicle user activating the vehicle door handle. This causes the vehicle to send an inductive wake up message. On receiving this, the key starts in active mode. The vehicle now sends further unmodulated, inductive fields which enable the key to ascertain its position in relation to the vehicle on the basis of field strength measurements. Bidirectional HF communication follows, in which cryptographically encrypted authentication data is transferred between the key and the vehicle. If the key is outside the vehicle, the vehicle is locked or unlocked following transferral of the correct data.

1.2.2 Drive permission with keyless go

In principle, when activating the start/stop button for a keyless engine start, the same process runs as that described for access permission of the BASIC model. The difference here is that the key must be located

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inside the vehicle, but needs not to push into the EZS (electronic ignition switch). The presence of the key inside the vehicle is verified on every 5km driven, and on driving away. The process that runs here is similar to the engine start process, although shorter. The cryptographically encrypted authentication between key and vehicle is accomplished by a bidirectional RF communication.

1.2.3 LF / HF transferral

The inductive wake-up message is sent in a phase-modulated (PSK) format through the vehicle on the frequency 21.845 kHz with a data rate of 5.461 kBd. With respect to bidirectional HF communications, these are processed in a frequency-modulated (FSK) format, in the ISM band on 433.92 MHz in Europe and 315 MHz in the USA. The rate of data transferral is 10 kBd.

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1.2.4 Operating frequencies of HF transferral

1.2.5 1-channel

In 1-channel operation, the mid-frequency of the channel is: ECE: 433.92 MHz USA, Japan: 315.00 MHz

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Vehicle Key BR166 – technical Description

form 659.02

1.2.5.1 3-channel

The following table shows the mid-frequency of the individual channels for each frequency band.

Channel name

Name

Channel 1 CH1 Channel 2 CH2

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Channel 3 CH3

Abbreviated

USA: 314.00 MHz ECE: 433.47 MHz USA: 314.90 MHz ECE: 434.37 MHz USA: 314.45 MHz ECE: 433.92 MHz

Channel mid-frequency

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Vehicle Key BR166 – technical Description

form 659.02

zul.

Toleranz

=f+g+a+b+c+d+e

68,100ms

±822µs

=p12+p23148,300ms

±1.765µs

1.3 HF protocol

1.3.1 3-channel operation

CH 1

"0" "0""0" "0""0" "1" "X"

obere

Sendefrequenz

untere

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Sendefrequenz

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Träger

Träger einschalten

aus

Vorimpulse

b c d e

-b-c-a-b-c

CH 2

X = beliebig

(abhängigvom Dateninhalt)

Start-

bit

i = a + b + c + d + e + f

- -c 0 ms

Daten

CH 3

"1""X""X" "X"

Nachlauf

Stop-

Kanal-

umschaltung

d+e+f

Träger einschalten

d+e+f+g a+d+e+f+g

bit

d+e

"0" "0""0" "1"

Vorimpulse

b c

i i

+e+f+g

"1"

Nachlauf

Stop-

Start-

Daten

bit

a+b+d

a+b+c+

d+e+f+g

Kanal-

umschaltung

Träger einschalten

bit

"0" "0""0" "1"

Vorimpulse

b c

Start-

"1"

Nachlauf

Stop-

bit

efd

Parameter Beschreibung Zeit

a b c d e

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f g h

12 23

Träger einschalten auf unterer Sendefrequenz 0,150ms ±50µs

Vorimpulse (550 Stück) 55,000ms ±550µs

Startbit 0,100ms ±1µs

Daten (120Bit=14Byte + 1Byte Checksumme) 12,000ms ±120µs

Stopbit 0,100ms ±1µs

Nachlauf 0,150ms ±50µs

Kanalumschaltung (Träger ausgeschaltet) 0,600ms ±50µs

Periodendauer eines Bit 0,100ms ±1µs

=a+b+c+d+e+f 67,500ms ±772µs

=d+e+f+g+a+b+c+d+e 80,200ms ±943µs

Funkprotokoll gesamt (=2*g+3*i) 203,700ms ±2.416µs

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Vehicle Key BR166 – technical Description

form 659.02

1.3.2 1-channel operation

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Vehicle Key BR166 – technical Description

form 659.02

1.4 Technical data

1.4.1 General HF specification

 Operating frequencies, tolerance

Single channel operation:

= 315MHz (USA, Japan)

op1

= 433.92MHz (ECE)

op2

3-channel operation:

= 314.00MHz / 314.45MHz / 314.9MHz (USA, Japan)

op1

f op2 = 433.47MHz / 433.92MHz / 434.37MHz (ECE)

Temperature shift –20 to +65 C: +/-35ppm Ageing: +/-10ppm

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Remaining deviation after adjustment: +/-2ppm Voltage dependency and drift XTO: +/-3ppm Total tolerances remaining after adjustment of the initial frequency +/-50ppm

1.4.2 Specification of the HF transmitter

 Transmission power EIRP:

ECE*: -14,4dBm….-22dBm USA/Canada ** -19.6dBm….-24dBm Japan(TELEC-T244)***: -19.6dBm….-24dBm

* maximum transmission power limit Taiwan : 80.83dbµV/m at a distance of 3m. With isotopic propagation, the maximum transmission power is –14.4dBm.

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** maximum transmission power limit according to FCC section15/Canada RSS-210:

3.75…12.5mV/m in the 260-470MHz range at a distance of 3m At 315MHz the figure is 6.042mV/m, which relates to a transmission power of –19.63dBm with isotopic propagation.

*** Use of the USA variant taken from the new TELEC-T244 Japanese standard Limit max. 25µW with transmission frequency of up to 315.25MHz, this relates to -16dBm Use of the USA variant

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Vehicle Key BR166 – technical Description

form 659.02

 Settling time for the transmission frequency (PLL)

StartUp

lock

= 500µs

 200µs with Δf = 600kHz with f

error

 10kHz

 Modulation, baud rate:

Single channel operation: 10 kBaud Manchester keyless go

3-channel operation: 10 kBaud Manchester Tolerances:  1.0 %

 Modulation type, range:

2-FSK: +/-15kHz to +/-17kHz basic key

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2-FSK: +/-15kHz to +/-21kHz keyless go key

 Emitted interference

o Harmonics & spurious

315MHz: : -49dBm @  960MHz (*

: -41dBm @ > 960MHz (**

(* This reflects the limit of 200µV/m as per FCC section 15, with isotopic propagation (**This reflects the limit of 500µV/m as per FCC section 15, with isotopic propagation

433.92MHz:

: -36dBm @ 1 GHz  -30dBm @ > 1GHz

all frequency bands:

 -54dBm @ UKW & TV bands (EN300220)

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47 -74MHz

87.5 –118MHz 174 –240MHz 470 – 862MHz

 Modulation quality:

Overshoot: Max. 100% of the nominal value Max. duration of the overshoot:

 6µs at 10 kBaud

Build / fall times: 0 % to 100% nominal value:

 6µs at 10 kBaud

The shift times are determined with a measuring receiver, the reception bandwidth of which lies as close as possible to the receiver in the application:

Remote Keyless Entry: BWRx= 600kHz Keyless go operation: BWRx= 200kHz

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Vehicle Key BR166 – technical Description

form 659.02

1.4.3 Specification of the HF Receiver (Keyless Go only)

Receiversensitivity with loop antenna P

: ≤ -75dBm

sens

Receiver bandwidth: typ. 220kHz LO- spurious < 1GHz: <-57dBm

LO- spurious > 1GHz: <-47dBm

1.4.4 Specification of the 3D-LF Receiver (Keyless Go only)

3 parallel X-/Y-/-Z-axis straight foreward LF-receiver with 3D inductive antenna RX-frequency: 21,845 kHz

Rx-data rate: 5,461kBaud

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Vehicle Key BR166 – technical Description

form 659.02

History V1.0 23.10.2009 First draft

V 1.01 09.11.2009 1.41/1.42 EEPROM at block diagram

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