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Annex No.5
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Functional description
S180052020
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User Manual / Functional Description
of the
Continental
Tire Pressure Generation 1C wheel unit
Type
S180 052 020
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1.
SYSTEM OVERVIEW
The tire pressure monitoring system (referred as TG for Tire Guard) consists of the following
uni
ts:-Tire guard wheel unit type
S180 052 020
which includes an integrated pressure, temperature
and acceleration sensor and a RF transmitter.
-
RF receiver unit which includes a RF receiver (not described in this document)
The TG monitors a vehicle's
tire pressure whilst driving or stationary. An electronic unit (wheel
unit) inside each tire, mounted to the valve stem, periodically measures the actual tire pressure.
By means of RF communication, this pressure information is transmitted to the RF
recei
ver/decoder.
2.
TECHNICAL DESCRIPTIO
N
Carrier frequency:
433.92 MHz
Frequency FSK deviation:
40 kHz max
Number of channels:
1
Type of modulation:
Frequency Shift Keying (FSK)
Baud rate:
9600bds
Rated Output Power:
< 10mW
Antenna:
Internal
Vo
ltage supply:
1 Lithium battery 3V (CR2450)
Voltage supply range
:
2.1 up to 3.2V
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3.
TYPICAL USAGE PATTER
N
DUTY CYCLE CALCULATION (EN 300 220
-
1)
PARKING: 1 burst transmission every 13H + 1 WUP transmission
FIRST BLOCK: During 2 minutes after vehicle st
art, burst emission every 16.8s (8 burst emission)
INTERIM FIRST BLOCK: none transmission
DRIVING: 1 burst emission every 67.2s during the rest of the hour (54 burst emission)
INTERIM: none transmission
=> During 1 hour, the Wheel Unit transmits 63 bursts
+ 1 WUP.
1 burst = 30.29806ms MAX
1 WUP length max = 42.1ms MAX
total transmission during 1 hour = 63 x 30.29806ms +
42.1ms
= 1.96s
DUTY CYCLE = (1.96 / 3600) x 100% =
0.06%
AVERAGE FACTOR CALCULATION (Standard 47 CFR Part 15C (periodic intentional
tr
ansmitter))
WUP definition:
-
Modulation FSK for the WUP
-
10 blocks in the WUP
-
5 bytes à "00" manchester in each blocks
WUP length = 41.664ms 1% (max = 42.1ms)
Averaging factor = 20xlog(42.1/100)=
-
7.5dB
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4.
BLOCK DIAGRAM
The block d
iagram below shows the main electronic units of the wheel unit:
3V
LITH IUM
BATTERY
Learning coil
RF CIRCUIT
ANTENNA
Pressure,
tem perature,
acceleration
sensor and
µcontroller
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5.
PICTURE
Label
Continental
S1
80052020
FCC ID:
KR5S180
020
IC:
7812
D-S180020
Operation is subject to the following two conditions: (1) this device
may not cause harmful
interference, and (2) this device must accept any interference received, including interference
that may cause undesired operation.
USA:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
co
nditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible f
or compliance
could void the user's authority to operate the equipment.
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