Schrader Electronics AFFPK4 TPMS Transmitter User Manual
- June 6, 2024
- Schrader Electronics
Table of Contents
SCHRADER ELECTRONICS.LTD..
MODEL: AFFPK4
USER MANUAL
The TPMS Transmitter is installed to the valve stem in each tyre of a vehicle. The unit measures tyre pressure periodically and transmits this information by RF communication to a receiver inside the vehicle. In addition, the TPMS Transmitter performs the following functions:
- Determines a temperature compensated pressure value.
- Determines any abnormal pressure variations in the wheel.
- Monitors the state of the Transmitters’ internal battery and informs the receiver of a low battery condition.
Fig 1: Sensor block diagram
MODEL: AFFPK4
Fig 2: Schematic
diagram
MODEL: AFFPK4
Modulation
During the Rotating Mode, The modulation used for the sensor is FSK (Frequency Shift Keying) with 50% Manchester bi-phase encoding.
Modes
Rotating Mode
While the sensor/transmitter in the Rotating Mode, it shall satisfy the
following requirements. The sensor/transmitter shall transmit an instantaneous
measured data, if a pressure change of 2.0 psi from the last transmission or
greater has occurred with respect to the following conditions. If the pressure
change was a decrease of pressure, the sensor/transmitter shall transmit
immediately every time it detects the 2.0-psi or greater pressure changes from
the last transmission.
If the pressure change of 2.0 psi or greater was an increase of pressure, the
sensor shall not react to it.
Stationary Mode
While the sensor/transmitter in the Stationary Mode, it shall satisfy the following requirements. The sensor/transmitter shall transmit an instantaneous measured data, if a pressure change of 2.0 psi from the last transmission or greater has occurred with respect to the following conditions. If the pressure change was a decrease of pressure, the sensor/transmitter shall transmit immediately every time it detects the 2.0-psi or greater pressure changes from the last transmission.
If the pressure change of 2.0 psi or greater was an increase of pressure, the silent period between the RPC transmission and the last transmission shall be 30.0 seconds, and the silent period between the RPC transmission and the next transmission (Normal scheduled transmission or another RPC transmission) shall also be 30.0 seconds, to be in compliance of FCC Part 15.231.
Factory Mode
The factory mode is the mode that the sensor shall transmit more often in the
factory to assure the programmability of the sensor ID during the
manufacturing process.
Off Mode
This Off Mode is only for production parts sensors that are used for the
builds during the production process and not in the service environment.
LF Initiation
The sensor/transmitter must provide data upon the presence of an LF signal.
The sensor must react (Transmit and provide data) no later than 150.0 ms after
the LF data code has been detected at the sensor. The sensor/transmitter must
be sensitive (As sensitivity is defined in Table 1) and able to detect the LF
field.
The device under test is manufactured by the grantee (Schrader Electronics) and sold as an OEM product. Per 47 CFR 2.909, 2.927, 2.931, 2.1033, 15.15(b) etc…, the grantee must ensure the end-user has all applicable / appropriate operating instructions. When end-user instructions are required, as in the case of this product, the grantee must notify the OEM to notify the enduser.
Schrader Electronics will supply this document to the reseller/distributor dictating what must be included in the end user’s manual for the commercial product.
INFORMATION TO BE INCLUDED IN THE END USER’S MANUAL
The following information (in blue) must be included in the end product user’s
manual to ensure continued FCC and Industry Canada regulatory compliance. The
ID numbers must be included in the manual if the device label is not readily
accessible to the end user. The compliance paragraphs below must be included
in the user’s manual.
FCC ID:MRXAFFPK4
IC: 2546A- AFFPK4
This device complies with Part 15 of the FCC Rules and with Licence exempt RSS standards of Industry Canada. Operation is subject to the following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
Any changes or modifications not expressely approved by the party responsible
for compliance could void the users authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a
class B digital device, pursuant to Part 15 of the FCC Rules.These limits are
designed to provide reasonable protection against harmfull interference in a
residential installation..This equipment generates,uses and radiates radio
frequency energy and,if not installed and used in accordance with the
instructions,may cause harmful interference to Radio communications. However
there is no guarantee that interference will not occur in a particilar
installation. If this equipment does cause harmfull interference to radio or
television reception ,which can be determined by turning the equipment off and
on ,the user is encouraged to try to correct the interference by one or more
of the following measures.
- Reonent or relocate the receiving antenna
- Increase separation between equipment and receiver .
- Connect the equipment into an outlet on a circuit different from that to which the reciver is connected..
- Consult the dealer or an experienced radio/TV technician for help.
WARNING: Changes or modifications not expressively approved by the party responsible for compliance could void the user’s authority to operate the equipment. The term “IC:” before the radio certification number only signifies that Industry Canada technical specifications were met.