DOC-0423-010 Rev A. 09/26/07
LF125KHz TPMS Transmitter
Module
Application Module for the Freescale REIMS
System
Hardware User Guide
Reference Documentation:
1) Freescale example LF125KHz TPMS Transmitter application software example and
documentation.
2) Freescale REIMS TPMS application reference manuals for detailed system
operation.
3) Freescale MC33690 and M9S08GT60 device user guides.
Table of Contents
Application Module for the Freescale REIMS System................................................................... 1
Cautionary Notes: ........................................................................................................................... 2
Terminology.................................................................................................................................... 3
Module Features ............................................................................................................................. 3
LF125 Transmitter Module Block Diagram...................................................................................4
Operational Description.................................................................................................................. 5
User Switches .................................................................................................................................5
ON / OFF Switch........................................................................................................................ 5
SW1 and SW2 Push Switches..................................................................................................... 6
SW3 Select Switch (Address).....................................................................................................6
User Indicators................................................................................................................................ 6
BDM Connector – Development Access Port................................................................................ 6
Battery............................................................................................................................................. 6
Axiom Manufacturing • 2813 Industrial Lane • Garland, TX 75041
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Email: Sales@axman.com Web: http://www.axman.com
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LF125KHz TPMS Transmitter Module User Guide
Cautionary Notes:
1) Electrostatic Discharge (ESD) prevention measures should be applied whenever
handling this product. ESD damage is not a warranty repair item.
2) Axiom Manufacturing reserves the right to make changes without further notice to
any products to improve reliability, function or design. Axiom Manufacturing does
not assume any liability arising out of the application or use of any product or circuit
described herein; neither does it convey any license under patent rights or the rights
of others.
3) EMC Information on the LF125KHz TPMS Transmitter Module:
a) 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.
TX FCC ID# TFY0423
b) Changes or modifications to this unit not expressly approved by Axiom
Manufacturing, could void the user’s authority to operate this equipment under
FCC or other regulatory agency rules.
c) This product is designed and intended for use as an application development or
evaluation platform in an educational or professional laboratory. This product is
not intended for application or installation in end user equipment or systems.
d) In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate prevention measures.
e) RF Exposure – This device exceeds t he FCC requirements for RF exposure when
the antenna used for this transmitter has a separation distance of at least 20cm
from all persons and must not be co-located or operating in conjunction with any
other antenna or transmitter.
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LF125KHz TPMS Transmitter Module User Guide
Terminology
Signal names in this document that are followed by an asterisk (*) denote an active-low
signal.
Module Features
The LF125KHz TPMS Transmitter Module is a demonstration, evaluation, or application
development platform for the Freescale MC33690 device or as an application module
for the TPMS REIMS evaluation system. Module operation is controlled by dedicated
firmware contained in the M9S08GT60 microcontroller flash memory. The module
provides the MC33690 LF125Khz transmitter under the control of the GT60
microcontroller. The installed application provides an address transmission to an
associated REIMS TPMS module. The REIMS module will provide the sensor reading
data in response. Sensor data is transmitted on a different frequency to the TPMS
system host controller.
The Module does not provide any external connections except for the BDM connector.
BDM connection will provide a method to load application firmware into the GT60
controller. A HCS08 BDM cable with 3.3V I/O may be applied, see the BDM
Development Port section for more details.
Application support features of the module include:
• ON / OFF Switch
• Push Switches SW1 and SW2
• Select Switch SW3, 6 position DIP switch.
• Indicators L1 and L2
• 9V replaceable battery
• BDM Port provided to load application firmware
Specifications:
Size: 2.1W, 3.7L, 1.5H (with battery) inches
Battery: 9VDC Transistor Type
Switches: 4, ON/OFF, 2x User Push, User Address (6 position)
Indicators: 2, Green and Red
Ports: BDM, J4 Serial not provided.
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LF125KHz TPMS Transmitter Module User Guide
LF125 Transmitter Module Block Diagram
J2 –
On /OFF
Switch
9V Battery
8.0MHz
Oscillator
3.3VDC
14.745MHz
Oscillator
8V and 3.3V
DC-DC voltage
regulators
8VDC
MC33690
Transmitter
Device
Control and
data signals
M9S08GT60
Micro control
8VDC
3.3VDC
J6 125KHz
Transmitter
coil /
antenna
L1 –
Red indicator
BDM Development
Port
SW3:
6 Position
Select Switch
SW1 –
Push
Switch
4
SW2 –
Push
Switch
L2 –
Green indicator
U3 / J4 – Level
convert and
connector not
applied.
LF125KHz TPMS Transmitter Module User Guide
Operational Description
The LF125KHz Transmitter Module is a basic demonstration platform for the MC33690
device controlled by a M9S08GT60 controller. Module configuration is set for 125KHz
transmit frequency only. Typical application provides for the transmission of address
data from the Select Switch (Sw3) to a remote REIMS module set to the same address,
and upon reception the REIMS module will report sensor data to a system host receiver.
The transmissions are sent at 9600 baud in ASK modulation with Manchester data
encoding.
Module power is derived from the on-board 9V battery with ON/OFF switch. When
ON/OFF switch is ON, battery voltage is applied to the module on-board voltage
regulators to provide 3.3V and 8VDC. Low voltage operation will reduce effective
range.
The GT60 controller accepts user input from the module switches and determines
operation under application software control. Default application will provide a user
push switch to enable a transmission. The GT60 will read the Select Switch data,
format the data, send the data to the MC33690 transmitter, and indicate transmission
with an indicator.
Agency approved operation of the transmitter applies maximum transmit power setting
of 8V peak to peak. The module 125KHz transmit coil (J6) should be at least 6 inches
from the receiver. Overdriving the remote receiver detector is possible if the distance is
too short.
The REIMS TPMS demonstration software and application documentation package
provides all necessary functions, operations, and controls to operate the module
correctly. Preset software definitions and C language function calls provide an easy
method to modify or adjust operation for particular applications.
User Switches
ON / OFF Switch
The ON /OFF switch applies power from the installed battery to the module when in the
ON position. Always place the switch in the OFF position when the module is not in
use.
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LF125KHz TPMS Transmitter Module User Guide
SW1 and SW2 Push Switches
Push switches provide user application controls. The default application applies SW2 as
the SEND switch. SW1 or 2 depressed will apply a logic low or 0 to the GT60 input port.
SW1 is applied to GT60 I/O port IRQ and SW2 is applied to port PTA3.
SW3 Select Switch (Address)
The Select Switch provides application input to determine which REIMS module to send
data to. All six positions provide a binary number when input by the GT60 controller. An
ON position provides a binary 1 value and an OFF position provides a binary 0 value.
The switch setting will indicate the binary number or address of the REIMS module
expected to receive the data. Select Switch is applied to GT60 I/O ports PTB0 – PTB5.
User Indicators
LED1 (RED) and LED2 (GREEN) are provided for user application indication. Default
operation provides LED2 (GREEN) as a transmit indicator. The LED indicators are
active when the GT60 I/O port is low or logic 0. LED1 is connected to GT60 I/O port
PTC4 and LED2 is connected to PTC5.
BDM Connector – Development Access Port
BDM provides a development connection to the GT60 controller. A standard 6 pin BDM
cable may be applied to load firmware into the GT60. The BDM connection should not
be applied during transmitter operation.
Battery
The battery is a 9V transistor type and may be replaced. If the module does not
operate, the battery voltage should be measured with a suitable voltmeter and replaced
if the voltage is at or below 8VDC.
Refer to the referenced internet web sights for additional applications information.
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