Rosen 9100452 User manual

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Rosen Entertainment Systems
Wireless FM Transmitter
Part# 9100458
User Guide

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Table of contents
Table of contents......................................................................... 2
General Description ..................................................................... 3
Architectural Overview ................................................................. 3
Block Diagram ............................................................................ 4
Operating Guide .......................................................................... 5
Interface board wiring diagram .................................................. 5
Interface / Pinout Definition.......................................................... 6
Design considerations .................................................................. 6
Appendix 1: Frequency Table ........................................................ 7
Appendix 2: Sample Code ............................................................ 8
Example Code .......................................................................... 8
Appendix 3: Schematic Diagram...................................................10
Appendix 4: Specifications...........................................................11

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
General Description
Rosen’s FMT module, part# 9100458 is a 12-channel FM transmitter
designed to transmit audio signals over the FM frequency band to
enable users to listen to audio from an independent video system over
the existing car audio system via the radio.
Architectural Overview
The FMT transmitter is designed around the BH1417 from Rohm. Refer
to the datasheet for details on this part. The module runs off a 5VDC
supply, left and right audio signals should be at 1V RMS to achieve
maximum volume.
A 74HC161 counter is used to control the channel selection of the FM
transmitter. The interface to the counter is accomplished by way of a
3-wire communication bus consisting of CLOCK, CLEAR and GROUND
lines. A 5V pulse on the CLOCK line will step to the next channel. A 5V
pulse on the CLEAR line will reset back to the default channel.
FM transmission can be switched on and off by applying and removing
the 5VDC supply to the module itself.
Notice : The changes or modifications not expressly approved by the party 
responsible for compliance could void the user’s authority to operate the 
equipment.
THIS DEVICE COMPLIES WITH PART 15 OF THE FCCRULES. OPERATIONS 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 INTERFEERENCE 
THAT MAY CAUSE UNDESRIED OPERATION 

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Block Diagram
The block diagram below shows the main components of the FMT
module and how they are interconnected.
Stereo
TDM
Pre-Scalar
Pre-Scalar
Divide Ratio
BH1417F
AMP
VCO
X1
7.60MHz
19KHz
Antenna
Counter

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Operating Guide
Using the supplied interface board you are able to test the operation of
the FMT.
To test your FMT setup as follows:
Connect the interface board to the FMT using the supplied 9-pin
harness.
Connect the power wires on the interface board to a voltage supply
between 4.8 & 5.2V DC. The red wire should connect to +ve and black
should connect to Gnd.
Connect a stereo audio source with a maximum 1V RMS signal to
Audio_R and Audio_L connectors.
Tune your radio receiver to 88.1Mhz. Audio should be heard.
To step to the next FM transmission frequency press the channel select
switch located on the interface board once. Re-tune your radio to the
next frequency and audio should once again be heard at this frequency.
Repeat steps 4 & 5 through all the 12 available FM transmission
frequencies. For full details see appendix 1
To stop FM transmission, switch off the +5VDC supply.
Interface board wiring diagram

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Interface / Pinout Definition
All control and audio is interfaced via a single connector JP1. It is
intended to connect to a control board allowing firmware to control the
channels selection as well as the power.
See the following table for a pin description and definition:
FMT JP1 Pin Definitions
Pin # Signal
Name
Function/Description
1 +5V This is the power to the FMT
2 AR_A Right audio input
3 AL_A Left Audio Input
4 GND FMT Ground Reference
5 Load Not used; held low
6 GND FMT Ground Reference
7 SEL2_A Counter clock; sets the output of the counter
8 SEL1_A Counter Clear; resets the counter to 0
9 ANT Not Used; for test purpose only.
Design considerations
- The module is intended to interface to a control board that will
send the required command to select the desired channel. This
can be achieved using a simple push button switch interface
however the architecture of the interface enables the interface to
be controlled by a micro controller. Ideally you should develop
an interface that will provide feedback to the user, possibly by
way of an OSD, to indicate which channel the transmitter is
currently set to.
- In order to disable the FM transmission as well as removing the
5VDC supply, the data lines (SEL2_A, SEL1_A, and Load) should
be held low.

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Appendix 1: Frequency Table
The frequency table below shows the value of the 74HC161 counter as
well as the corresponding FM transmission frequency
2: 88.1 MHz
3: 88.3 MHz
4: 88.5 MHz
5: 88.7 MHz
6: 88.9 MHz
7: < no setting > { 7 is a meaningless value }
8: 106.7 MHz
9: 106.9 MHz
10: 107.1 MHz
11: 107.3 MHz
12: 107.5 MHz
13: 107.7 MHz
14: 107.9 MHz
15: <no setting> { 15 in a meaningless value }

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Appendix 2: Sample Code
The sample code below is used to communicate to the FMT using a PIC
micro controller, when using this method in conjunction with
outputting information on a video screen a user is able to see visually
on screen the status of the FMT.
Example Code
I/O Name Function
SEL1_A: Clear
SEL2_B: Clock
FMTLOAD: Load (reset)
*** INITIALIZATION PROCESS ***
// Initialization I/O
SEL1_A = 1;
SEL2_A = 1;
FMTLOAD = 1;
// Reset Counters
SEL1_A = 0;
< delay 2 microseconds >
SEL1_A = 1;
// Restore Previous
< read stored station from EEPROM >
< call function to update the FMT device with stored station >
*** FMT DEVICE UPDATE PROCESS ***
// verify that new station is to be programmed
// reset counter
SEL1_A=0;
< delay 2 microseconds >
SEL1_A=1;
// increment counter until desired station is achieved

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
// do the following for each increment of the station
// example:the following 3 lines should be done 3 times to set
88.3
SEL2_A=0;
< delay 2 microseconds >
SEL2_A=1;
// store new station in EEPROM

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Appendix 3: Schematic Diagram
D3
C3
.01uF
12
C4
1uF/10V
1 2
ITT Cannon Slide Switch
Q1
MBT4401
1
2 3
D0
LA
R44
10K
1 2
R40
10K
12
R7
4.7K
12
C5
3300pF
12
S1
AYZ0102AGRL
2
1
3
<OrgAddr4>
E06
<OrgName>
<Doc>
Thursday, September 16, 2004 12
B
<OrgAddr1>
<OrgAddr2>
<OrgAddr3>
Schematic; Wirless FMT; Audio Input and Power
<Cage Code>
Size
Scale
CAGE Code DWG NO Rev
Sheet
of
C2
100uF/16V
12
R4
22K
12
D2
R24
10K
12
AR_A
-6dB
R3
22K
12
R19
10K
12
JP1
HEADER 9
1
2
3
4
5
6
7
8
9
C6
3300pF
12
Q2
MMBT4401
1
2 3
AL_A
R9
4.7K
1 2
R1
1K
1 2
C17
.01uF
12
GND
D1
-6dB Att
RA
+5V
GND
R14
3.3K
1 2
R21
10K
12
U2
74HC161D
3
4
5
6
7
10
2
9
1
14
13
12
11
15
16
8
A
B
C
D
ENP
ENT
CLK
LOAD
CLR
QA
QB
QC
QD
RCO
VCC
GND
SEL2_A
R12
10K
1 2
R22
10K
12
R6
4.7K
12
SEL1_A
R23
10K
12
C12
1uF/10V
1 2
+5V
+5VA
ANT
+5V
R20
10K
12
C
23
0
022uF
12
C36
0.01uF
12
Q3
2SD2142K
1
2 3
C27
27pF
1 2
C21
1000pF
1 2
C31
1000pF
12
LA
D5
KV-1471E
1 2
D3
C28
3pF
12
C24
180pF
12
C26
330pF
12
D2
C29
0.001uF
1 2
R35
10 ohm
12
C34
10uF/16V
1 2
R34
10K
1 2
<OrgAddr4>
E0
6
<OrgName>
<Doc>
Frida
y,
Au
g
ust 27
,
2004
2
2
B
<OrgAddr1>
<OrgAddr2>
<OrgAddr3>
Schematic; Wirless FMT; Transmiter and Control
<Cage Code>
Size
Scale
CAGE Code DWG NO Rev
Sheet
f
C18
10uF/16V
12
C33
10uF/16V
12
ANT1
ANTENNA
1
-6dB
L2
5CBM
12
D1
C19
180pF
12
X1
7.6MHz
1 2
C30
27pF
1 2
U3
BH1417F
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22 RA
R-PRE
R-LP
FILTER
COMP-OUT
GND
PLL-OUT
VCC
RF-OSC
RF-GND
RF-OUT
PLL-VCC
XTAL1
XTAL2
D0
D1
D2
D3
PILOT-OUT
L-LP
L-PRE
LA
R25
0
1 2
R29
10K
1 2
C25
330pF
12
KDV154A
C22
10pF
1 2
C32
100uF/16V
12
RA
D0
R33
10K
13
2
R28
10K
1 2
R27
5.1K
12
R32
20K
1 2
R31
100
1 2
R30
10K
12
C16
10uF/16V
12
C20
0.0022uF
12

Rosen Entertainment Systems LLC 8/30/2005
Rosen FMT. Part # 9100458
Appendix 4: Specifications
Operation power supply voltage 4.8 ~ 5.2 V DC
Transmission Frequency 88.1 ~ 88.9Mhz,
106.7 ~ 107.9 Mhz.
Step 200Khz
Operating Temperature 0 ~ 60°C
Dimensions 70mm x 34mm x 11mm