Manual 2K7959760A
Date: 07/23/2020 version 0.2 page1 of 3
1.1.1 Frequencies
Bluetooth Low Energy f=2402MHz ÷ 2480MHz
1.1.2 Function description
Image1 S-SG
The S-SG in the car seat is powered by a built-in battery. The mechanical construction enabling the
exchange of the battery without special tools or soldering. The S-SG sends the status information of
the belt buckles and the status of seat occupancy sensors. The information is sent either at the time
when a change is detected, or every 25 seconds cyclically. The reading period of the AD value of the
resistance circuit in the seat occupancy sensor is 200 ms, it can be changed by software. The battery
voltage is read once a day. The algorithm for the evaluation of the battery status then sends the
current value in every Bluetooth message. The S-SG is contacted only at the time of data
transmission with the F-SG, otherwise it is in the (low power mode) power saving mode.
Manual 2K7959760A
Date: 07/23/2020 version 0.2 page2 of 3
1.1.3 Error conditions
The device can not detect faulty state of belt buckle, the analog value is not measured at the
entrance, there is only detected a logic signal. The device detects error state values at the inputs to
determine the seat occupancy. The following error conditions are detected:
Table1 Limit values of the sitting sensor
error signal
value
tolerance
description
delivery status
After switching on the device, the value is
not read (not used in practice)
Low resistance value
R <60 Ω
60 ± 4 Ω
The wires are connected or shorted to
GND
Seat occupied
60 Ω <= R <= 250 Ω
60 ± 4 Ω
250 ± 8 Ω
Correct value is expected
Average resistance
value
Is not used
unexpected invalid resistance
Vacant seat
250 Ω <R <= 620 Ω
250 ± 8 Ω
620 ± 15 Ω
Expected valid value
High resistance value
R> 620 Ω
620 ± 15 Ω
Wires broken or high resistance
Image2 Error detection algorithm on the input of the occupied seat
Manual 2K7959760A
Date: 07/23/2020 version 0.2 page3 of 3
1.1.4 Temparature or voltage operating range
temperature: -40C ÷ +80C
voltage: battery 3,3V; CR2477
The manufacturer of this radio equipment declare that devicecomply with the
ISED regulation:
IC: 25953-WSBRS001
NOTICE:
This device complies with Part 15 of the FCC Rules [and contains license-exempt
transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development
Canada’s licence-exempt RSS standard(s)].
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.
L’émetteur/récepteur exempt de licence contenu dans le présent appareil est conforme aux
CNR d’Innovation, Sciences et Développement économique Canada applicables aux
appareils radio exempts de licence.
L'exploitation est autorisée aux deux conditions suivantes:
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'appareil doit accepter tout brouillage radioélectrique subi, même si le
brouillage est susceptible d'en compromettre le fonctionnement.
NOTICE:
Changes or modifications made to this equipment not expressly approved by (manufacturer
name) may void the FCC authorization to operate this equipment.
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dans d''autres langues
- English: Aev Spol WSBRS001 User manual
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