operational description

FCC ID: GQ4-56T

Operational Description

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FCCID_1686945

TRW Automotive

March 16, 2012 TEE
24175 Research Dr.
Farmington Hills, MI 48335-2642
Tel 248.478.7210
Fax 248.699.4241

RE: Certification for HKMC MY2012.5 YD/QD 315MHz TPM Sensor
Model #: 225816-116
FCC ID: GQ4-56T
Canada IC: 1470A-37T

GENERAL DESCRIPTION

This device is a transmitter/sensor with tire valve, which is mounted in the valve hole of the rim and measures the
pressure inside the tire, as well as if the vehicle is in motion. These measurements are then transmitted over Radio
Frequency (RF) to a receiver also located in the vehicle. The device also has a Low Frequency (LF) receiver. This
receiver supports Low Frequency (LF) magnetic field communications allowing the changing of
measurement/monitoring states of the transmitter by commands sent via the TPM diagnostic tool. The RF signal
operates at 315MHz and uses FSK Manchester code modulation.

Description of Operation

Sensor Frequency of
Description
State/Mode Transmission
Storage Measures pressure. Single 8-Frame
TPS Message upon
LF request.
Sleep Measures pressure and motion. Single 8-Frame
TPS Message upon
LF request.
Motion Measures pressure and motion. Single 8-Frame
Transmits periodically. TPS Message at 16
second intervals for
1st minute after
exiting Sleep State
and then at 1
minute intervals or
upon LF request.
Motion Alert Measures pressure. 1 minute period of
Transmits when: 4 second interval 8-
a) significant pressure delta Frame TPS
detected Messages
Sleep Alert Measures pressure and 5 second cycle of
temperature. 200ms period,
Transmits when: 50% duty cycle
a) significant pressure delta Single-Frame TPS
detected with change in pressure Message
to temperature ratio
Rest Measures pressure and motion. Single 8-Frame
TPS Message upon
LF request.

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Document Created: 2012-04-25 14:48:37
Document Modified: 2012-04-25 14:48:37

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