Continental Automotive Technologies S122780002 Tire Pressure Unit User Manual
Continental Automotive GmbH Tire Pressure Unit
User manual
Annex No.5
Technical Description
S122780002
SIEMENS VDO Automotive SV C BC P2 RF
IC:267T-22780002 FCC ID:KR5S122780002
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User Manual / Functional Description
of the
Siemens VDO
Tire Pressure Generation 1B EUCD wheel unit
Type
S122780002
SIEMENS VDO Automotive SV C BC P2 RF
IC:267T-22780002 FCC ID:KR5S122780002
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File: K:\POSTZULA\Tpms_TG\TG1B_EUCD\Technische_Doku\FunctionalDescription-TG1B-EUCD_S 122780002.doc
1. SYSTEM OVERVIEW
The tire pressure monitoring system (referred as TG for Tire Guard) consists of
the following units:
- Tire guard transmitter S122780002 which includes an integrated pressure,
temperature and acceleration sensor and a RF transmitter.
- RF receiver unit which includes a receiver (not described in this document)
The Tire Guard system 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
receiver/decoder.
In stationary mode, the pressure, temperature and acceleration are measured
about every minute and emission of RF frames occurs only if pressure variation,
higher than a threshold, is detected (leakage detection).
When the vehicle starts moving, the Tire Guard transmitter enters the driving
mode. It measures and transmits RF burst 12 times per minute (every 5s) up to
30 bursts. After this period the wheel unit measures and transmits data every
minute. The wheel unit will remain in driving mode for a period of 15 minutes
after the vehicle is stopped. After this period has elapsed, the wheel unit returns
to stationary mode.
If, during any measurement period in driving mode, the pressure leakage is
detected (difference compared to the last transmitted pressure value), a re-
measure will occur after 5s taking in account the latest pressure value emitted as
reference value. If the pressure continues changing, an additional transmission
will be sent.
The circuit within the wheel unit monitors the battery every time a pressure
measurement is taken. A “Low Battery” function code will be sent when the
battery voltage within the wheel unit is below a pre-selected level.
SIEMENS VDO Automotive SV C BC P2 RF
IC:267T-22780002 FCC ID:KR5S122780002
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2. BLOCK DIAGRAM
The block diagram below shows the main electronic units of the wheel unit:
3V
LITHIUM
BATTERY
Learning coil
RF CIRCUIT
VALVE ANTENNA
Pressure,
temperature,
acceleration
sensor and
µcontroller
3. TYPICAL USAGE PATTERN
240 burst in 24 hours
0.01 seconds per frame and 3 frame per burst
→ total transmission duration of 7.2 seconds within 24 hours
Transmitter ON 0.3 seconds / hour
Transmitter OFF 3599.7 seconds / hour
Duty Cycle: TON / T (ON+OFF) x 100% = 0.3 / 3,600 x 100 % = 0.008 %
4. TECHNICAL DESCRIPTION
Carrier frequency: 433.92 MHz
Rated output power: < 10 mW
Frequency shift: ± 45 kHz max
Number of channels: 1
Type of modulation: FSK
Method of frequency generation: PLL
Antenna: integral
Voltage supply: 1 Lithium battery 3V (CR2450)
Voltage supply range: 2.1 up to 3.2V
SIEMENS VDO Automotive SV C BC P2 RF
IC:267T-22780002 FCC ID:KR5S122780002
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5. LABEL DESIGN Canada, Europe, USA
Siemens VDO
S122780002
IC: 267T-227002
FCC ID:KR5S122780002
Entry Owners Manual, Canada, USA:
NOTE
This device complies with part 15 of the FCC Rules and RSS-210. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference, and (2) this
device must accept interference received, including interference that may cause undesired
operation.
COUTION
Changes or modifications not expressly approved by the manufacturer could avoid the user's
authority to operate the equipment.