Tire Pressure Monitoring Sensor Model: TIS-19 Type ASK/FSK 433.92 MHz 1 of 5 1. SYSTEM OVERVIEW The tire pressure monitoring system (referred as TPMS) consists of the following units:
- Tire pressure monitoring system type TIS-19 which includes an integrated pressure, temperature and acceleration sensor and a RF transmitter.
- LF part which includes a LF receiver (not described in this document) The TPMS 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. 2. TECHNICAL DESCRIPTION Carrier frequency:
Number of channels:
Type of modulation:
Baud rate:
Antenna:
Voltage supply range:
Temperature range:
433.92 MHz 1 Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) 9600bps Internal 2.1 up to 3.2V
-40 up to +120C 3. TYPICAL USAGE PATTERN 3.1 AVERAGE FACTOR CALCULATION (Standard 47 CFR Part 15C (periodic intentional transmitter)) Maximum transmitting duration in whatever 100ms windows: 16.83ms
Averaging factor = 20xlog(19.73/100)=--15.6dB Detail of the calculation:
Baudrate = 9600bps
Bit duration (max) = 1.01/9600 = 105.208us Tolerance Baudrate = 1%
Frame Length = 40 bytes = 320 bits ASK dutycycle = 50%
Frame duration (max) = 16.83ms Averaging Factor = 20*log (Frame duration / 100ms) Averaging Factor = -15.6dB 2 of 5 26M H z P re ssu re , A N T E N N A 4. BLOCK DIAGRAM The block diagram below shows the main electronic units of the wheel unit:
5. PICTURE tem p eratu re , acce le ra tio n se nso r a nd co ntrolle r R F C IR C U IT Le arning co il B A T T E R Y LIT H IU M 3V X tal 3 of 5 6. LABEL 6.1USA Continental TIS-19 FCC ID: KR5TIS-19 FEDERAL COMMUNICATIONS COMMISSION INTERFERENCE STATEMENT 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 harmful interference in a residential installation. This equipment generates, uses and can radiate 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 particular installation. If this equipment does cause harmful 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:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/ TV technician for help. 6.2 CANADA Continental Model: TIS-19 IC: 7812D-TIS19 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. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 4 of 5 5 of 5