HELLA FS1901S Passive Entry or Passive Start Radio Identification Devices User Manual
- June 9, 2024
- HELLA
Table of Contents
FS1901S Passive Entry or Passive Start Radio Identification Devices
User Manual
FS1901S
Passive Entry / Passive Start
radio identification devices
FS1901S family overview
This document is to describe the FS19S family of Radio Identification Devices (RID) intended for use in automotive Passive Entry / Passive Start systems. All family members use the same PCB layout and basic type of housing. There are different variants regarding number of buttons, finish of the housing, labelling of the housing etc. Images of the devices are given in chapter 5.
Safety warnings and precautions
Do not ingest battery, Chemical Burn Hazard
This product contains a coin / button cell battery. If the coin /button cell
battery is swallowed, it can cause severe internal burns in just 2 hours and
can lead to death.
Keep new and used batteries away from children. Should a child swallow a
battery, consult a physician immediately.
If the battery compartment does not close securely, stop using the product and
keep it away from children.
If you think batteries might have been swallowed or placed inside any part of
the body, seek immediate medical attention.
CAUTION
Risk of explosion if the battery is replaced by an incorrect type Keep
batteries away from direct sunlight, high temperature, and high humidity
Please be sure to observe the following warnings. As batteries contains
flammable substances such as lithium or other organic solvents, they may cause
heating, rupture or ignition
Warning
- Do not charge, short, disassemble, deform or heat batteries. Do not throw batteries into fire.
- When discarding batteries, insulate the positive and negative terminals of batteries with insulating tape, etc. When disposed of improperly, lithium batteries may short, causing them to become hot, burst or ignite.
Caution
- Be sure to connect the positive and negative electrodes correctly.
- Avoid mixed use of batteries, i.e. new, used or different types.
- Avoid direct soldering to batteries.
Communication technologies
There are two basic communication technologies implemented in the FS19S devices
- Low Frequency (LF) communication, used for waking up the devices and for communication with the immobilizer system of the vehicle
- RF (UHF) communication, used for communication between radio identification devices and vehicle
FS1901S Technical data summary
| Markets | USA, Canada |
|---|---|
| Model name | FS1901S |
| DC Supply voltage range | Approx. 2.2V to 3.2 V |
| Technology | |
| RF (UHF) | Number of RF channels (1) |
| RF channel frequencies 0) | 433.46 MHz |
433.92 MHz
434.36 MHz
RF radiated power| Approx. 78 dBpV/m a 3m (average)
Mode of operation| Simplex TX only (RKE mode)
Half duplex TRX (PKE mode)
Modulation method| FSK (F1 D)
Frequency deviation| +/- 7.8 KHz (RKE mode)
+/ – 20 KHz (PKE mode)
Data rate| 7.8 Kbit / s (RKE mode) 19.2 Kbit / s (PKE mode)
RF Antenna| Integrated PCB loop
LF| Operating frequency| 125 kHz
Modes of operation| LF detector
Passive Transcoding
(1) Not all channels may be used for every RF mode of operation
Table 1: Versions of Hella FS1901S
FS1901S pictures
The following illustrations show the exterior view of the FS1901S devices.
The images are exemplary, other designs e.g. with less buttons or less side
buttons or different button labels or different button positions or different
colors or different customer label or different finish may exist.
FS1901S Modes
of operation
The following chapters describe the modes of operation that can be carried out
by the FS19S devices.
6.1 Remote keyless entry (RKE)
The Remote Keyless Entry (RKE) functions enable the user to control the
central locking system and other functions of a vehicle from a distance. It is
always manually activated by pressing one of the buttons on the device. When
activated, the device will transmit a sequence of RF messages on two of the
available RF channels.
6.2 Keyless Entry / Keyless Go (PKE)
Keyless Entry / Keyless Go functions allow the user control of the central
locking system and engine start / stop without manual operation of the key.
For these functions the devices can be woken up by a 125 kHz low frequency
(LF) signal generated by the vehicle. For recognition of LF signals the
devices contain a set of 3 orthogonal sensor coils (LF antenna array) and a
detection circuit that is integrated in the main μC. For Keyless Entry /
Keyless Go functions RF communication takes place in half duplex mode on two
of the available RF channels.
6.3 Transponder mode
The transponder mode serves as ab backup means for communication with the
immobilizer system if the Keyless Go function is not available for any reason.
In transponder mode the device is supplied from the magnetic field generated
by the immobilizer system of the vehicle and communicates with the vehicle
using damping modulation. The nominal working frequency of the transponder
system is 125 KHz. No active RF communication is used in transponder mode.
Therefore, the device does not generate or emit any RF energy in this mode.
Statement:
This device complies with Part 15 of the FCC Rules. 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.
This document is confidential. Its contents are not to be exploited, passed on or disclosed to third parties without our express permission. All rights are reserved.
Date: 2022-09-07
Processed:
O. Kush ova E-CA-D-HW
Dr. F. Panchway E-CA-D-HW
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