Block Diagram

FCC ID: GQ4-3QR

Block Diagram

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FCCID_368162

August 14, 2003 TRW Automotive U.S. LLC d.b.a TRW Automotive Electronics 24175 Research Drive TRW Farmington Hills, MI 48335 Tel: 248.478.7210 Fax: 248.478.7241 RE: Certification for TRW TPM ’04 Receiver Model #: 39350-S3V-A0 FCC ID: GQ4-3QR Canada IC: 1470A-2R BLOCK DIAGRAM Receiver LF Power- 10MHz Supply Cond. 5 xtal Batt. + Voltage Regulator 125KHz - 160KHz to Init Cond. RF Filter / 4 Amplifier EEPROM RF Micro Demod. Controller K-Line 5.086MHz K-Line xtal LED Drive Discrete LED Drive Input 7 Buffer LF Ground Cond. 5 Figure 2. TPM Receiver Block Diagram EXHIBIT_______ Confidential / Trade Secret Information Page ___ of ___

August 14, 2003 TRW Automotive U.S. LLC d.b.a TRW Automotive Electronics 24175 Research Drive TRW Farmington Hills, MI 48335 Tel: 248.478.7210 Fax: 248.478.7241 RE: Certification for TRW TPM ’04 Receiver Model #: 39350-S3V-A0 FCC ID: GQ4-3QR Canada IC: 1470A-2R GENERAL DESCRIPTION The TPM receiver is used to demodulate and decode information transmitted from the wheel- mounted sensors. This information is then sent to a display unit. The receiver shall directly illuminate the display with discrete light emitting diode (LED) drivers. The receiver can initiate the transmitter to send configuration data or pressure and temperature data by activating the low frequency initiator mounted in the wheel well. This activation can also be used to determine if a new transmitter has been placed in the TPM. The receiver shall be able to do diagnostics on the system to determine if the system needs to be serviced. The receiver can also place the transmitter in a low current mode when the ignition is off to prolong the battery life of the transmitter. When the ignition is turned on, the receiver should put the transmitter in to a high update rate mode and immediately get the tire and pressure information from the transmitter. Activating the transmitter with the low frequency initiator does the mode changes. EXHIBIT_______ Page ___ of ___

August 14, 2003 TRW Automotive U.S. LLC d.b.a TRW Automotive Electronics 24175 Research Drive TRW Farmington Hills, MI 48335 Tel: 248.478.7210 Fax: 248.478.7241 RE: Certification for TRW TPM ’04 Receiver Model #: 39350-S3V-A0 FCC ID: GQ4-3QR Canada IC: 1470A-2R PRINCIPLES OF CIRCUIT OPERATION The receiver contains a microprocessor and firmware that control the entire TPM system. The microprocessor sends low frequency (125KHz) amplitude-shift-keying data to the initiator via a signal conditioning circuit and wire harness. The initiator, which is located in the wheel well, amplifies this signal and transmits data to the tire pressure sensor located in the wheel. The sensor responds with data modulated at 315MHz. The receiver demodulates this 315MHz signal to receive the data sent from the pressure sensor. Tire pressure problems are reported to the driver via light emitting diodes on the dashboard. The receiver illuminates the LEDs with LED driver circuitry. EXHIBIT_______ Confidential / Trade Secret Information Page ___ of ___


Document Created: 2003-10-20 13:17:54
Document Modified: 2003-10-20 13:17:54
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