Omron OKA-450R User manual

OKA-450R
(P/N:96486309)
(P/N:96486310)
Receiver, Tire Pressure Monitoring System

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FCC Statement
A.User’s Guide
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.
B.FCC Compliance 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 acircuit different from that to which the
receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help.
C.Caution !!!
Any changes or modifications to the equipment not expressly approved by the party
responsible for compliance could void user’s authority to operate the equipment.

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Table of contents
1. Constitution of the Tire Pressure Monitoring System for vehicle....................... 2
2. User’s manual (provisionally) .......................................................................... 3
3. Block diagram ................................................................................................ 4
4. Specification ................................................................................................... 5
5. Features .......................................................................................................... 6
6. PCB
6.1 Parts layout (front)...................................................................................... 7
6.2 Pattern layout (front).................................................................................... 8
6.3 Parts list ...................................................................................................... 10
7. Connector ..................................................… ................................................. 13
8. Photographs .................................................................................................... 14
Appendix Circuit Diagram

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1. Constitution of the Tire Pressure Monitoring System
for vehicle
Tire Pressure Monitoring System is the system that receives the information, from transmitters installed at
each tire, about the inflation pressure or temperature of tires detected by the sensor, so that the system can
detect the abnormality of tires like fallen inflation pressure. This system consists of transmitter, receiving
antenna, and receiver. The transmitter sends information of tire, read by the sensor, in the form of radio
wave at constant intervals. The receiver is fixed inside the vehicle. If IG is OFF, it works intermittently to
prevent the battery exhaustion. When the receiver detects the synchronous code and IG is ON, it runs
continuously to receive the signals completely. If the received code is normal, the system will not inform
the user. As shown below, in the case that the transmitter sends information that the tire is in abnormal
condition, and that the receiver system has a trouble, the system will inform the user with lighting up
Warning bulb.
TPMS Warning bulb is lit by the following situations.
Bulb disconnection detection output(The warning light is On for 3 sec. when IG=OFF→ON)
Tire air pressure warning output (Warning light is ON)
System warning output (Warning light is blinking)
Pressure sensor
CPU
Receiving circuit
CPU
Bulb
EEPROM
Transmission circuit
Transmitter 1
Receiver
Inside Antenna
Transmitter 2
Transmitter 3
Transmitter 4
Figure 2-1 System Architecture
Tire
Transmitter (Spare Tire)

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2. User’s manual (provisionally)
Tire inflation pressure warning light
This light illuminates if the inflation pressure of any tire (except for compact spare tire) drops while the
ignition key is in the “ON”position. It normally illuminates when the ignition key is turned to the “ON”
position and goes off a few seconds later.
If the warning light illuminates while driving
Avoiding hard braking, hard steering, and high speeds, drive to the nearest gas station or authorize car dealer
and adjust the tire inflation pressures.(except for compact spare tire)
If the warning light blinking while driving
It is thought abnormality of the device,go to the check to the nearest car dealer as soon as possible.
Whenever the tires and wheels are replaced with new ones
Tire inflation pressure sensors must be fitted on the new wheels and their ID codes must be programmed into
the system. Have tire and wheel replacement performed by an authorized car dealer to avoid the risk of
damaging the tire inflation pressure sensors.
CAUTION
·If the tire inflation pressure warning-light does not illuminate when the ignition key is turned to the “ON”
position the system may be faulty.
·If the tire inflation pressure warning light illuminates while you are driving, avoid hard braking, hard
steering, and high speeds. Otherwise, you could make the vehicle unstable and have a serious accident.
·The tire inflation pressure warning light may not illuminate immediately in the event of a tire blowout or
rapid leak..
Warning light

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3. Block diagram
This is the block diagram concerning to the receiver.
10.178125 MHz
8 MHz
Figure 3.1 block diagram of the receiver
16BIT
CPU
RECEIVING
MODULE
EEPROM
POWER
SOURCE(5V)
data
OUTPUT
CIRCUIT
input
output
Signal of vehicle status
12V (car battery)
bulb
IG1

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4. Specification
4.1 CPU TYPE M301N2F8T-FP
Manufacture : Renesas
Memory type Flash memory
ROM (bytes) 64K
RAM (bytes) 3K
Operating voltage (V) 4.2 to 5.5
Operating temperature (°C) -45 to 85
Operating frequency (MHz) 16
Timer (ch) 16bit x 1 8bit x 4
DMAC (ch) -
Serial I/O Clock Sync./UART x 2
A/D converter 10bit x (12 + 2) ch
D/A converter 8bit x 1
External Interrupts (sources) 8
CRC Operation Circuit -
Watchdog Timer Avl.
CAN (ch) 1
Special function CAN SIO Sub clock Serial I/F
Remarks Automobile
4.2 EEPROM
Local clock frequency 315 MHz
Frequency generation Crystal resonator
Modulation Single Superheterodyne
Bandwidth ±200KHz
Sensitivity 30dBuV

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4.3RF block
Type S-93C66AMFN-TB
Manufacture : ETC
Memory 4Kbit
Package 8pin SOP
4.4Others
Dimension 95mm×85mm×30mm
Weight 180g
Battery Car Battery (DC 12V)
Operation Voltage DC 12V, 20mA
Operation temperature -30?~ +85?
5. Features
Battery saving
The receiver works intermittently to reduce the battery consumption. The microcomupter embedded on
the receiver controlls the power supply for the RF circuit. In case of the microcomputer detects the
wake-up signal during the power supplied, the microcomputer continue supplying the power until the data
frame will be received.

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6.Connector
This is the pin assignment of the connector.
Figure 6.4.1 the shape of the connector
Figure 6.4.2 This is the pin assignment of the connector

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7.Difference between 96486309 and 96486310
96486309 : When OKA-450R Receiver is using with the OKA-210T model which send the data when Tire
Pressure is less than 210 kPa, the part number “96486309” is assigned.
96486310 : When OKA-450R Receiver is using with the OKA-220T model which send the data when Tire
Pressure is less than 220 kPa, the part number “96486310” is assigned.