1
MSM9552/MSM9553
Semiconductor
GENERAL DESCRIPTION
The MSM9552 and MSM9553 are LSI devices which demodulate FM character multiplex signals in
the DARC (DAta Radio Channel)* format to acquire digital data. The MSM9552 and MSM9553
operate on 5V and 3V, respectively. In the DARC format, baseband signals at ordinary FM
broadcasting frequencies are multiplexed with 16k-bps digital data which are L-MSK-modulated at
76kHz.
Each of the MSM9552 and MSM9553 has a bandpass filter consisting of SCF, frame synchroniza-
tion circuit, error correction circuit, etc. on a single chip.
So, a system for acquisition of digital data can be easily constructed by externally mounting an FM
receiver tuner, microcontroller for control, and memory for temporary storage of data.
The MSM9552 and MSM9553 have a simple configuration, and are equipped with only necessary
functions. By making changes to software for the external microcontroller, the MSM9552 and
MSM9553 can meet the various requirements of FM multiplex broadcasting services which will be
offered in future.
These LSI devices are best suited to the radio sets and information devices for FM character multiplex
broadcasting, which started in Japan in October 1994. Especially, the MSM9553 is suitable for
portable units.
* DARC is a registered trademark of NHK ENGINEERING SERVICES, INC.
Note that a contract needs to be made with NHK Engineering Service if a manufacturer produces/
sells electronic equipment utilizing the DARC technology.
FEATURES
Built-in bandpass filter (SCF)
Built-in block synchronization circuit and frame synchronization circuit
Setting of the number of synchronization protecting stages
Regeneration of data clocks by digital PLL
1T delay detection
Built-in error correction circuit
Built-in layer 4 and layer 2 CRC check circuit
Microcontroller parallel interface
Clock output for external devices (64kHz to 8.192MHz selectable)
International standard frame format
Power source:
5V (MSM9552), 3V (MSM9553)
Package
44-pin plastic QFP (QFP44-P-910-0.80-2K)
Semiconductor
MSM9552/MSM9553
LSI for FM Multiplex Data Demodulation
Semiconductor
MSM9552/MSM9553
2
BLOCK DIAGRAM
A
IN
Data bus
DB0-DB7
Address
AD0-AD5
CS
WR
RD
CLR
+
1T delay
circuit
LPF
Variable
gain
AMP
BPF
(SCF)
XTAL1
XTAL2
XOUT
XOUTC
D
Q
CK
DB2
WR31
CLR
DV
DD
Frequency
divider
LSI internal
clock
Limitter
Vref
+
Limitter
SG
LPF
Clock
regeneration
Block
synchronization
Frame
synchronization
Timing
control
PN
descrambler
34Byte RAM
2
Read
write
register
Error
correction,
Lay 2 CRC
Layer 4 CRC
CPU interface
Data bus
Addressbus
INT
Filter
Delay Detection
Digital Signal
Processor
3
MSM9552/MSM9553
Semiconductor
44-Pin Plastic QFP
Note:
Leave the NC pins open.
PIN CONFIGURATION (TOP VIEW)
34
44
33
23
22
12
1
11
A0
XOUT
CS
XTAL2
XTAL1
DV
DD
DGND
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
RD
NC
WR
INT
MOUT6
MOUT5
MOUT4
MON
ADETIN
AV
DD
AGND
SG
A
IN
XOUTC
MOUT0
MOUT1
MOUT2
MOUT3
A1
A2
A3
A4
A5
NC
CLR
IORD
IOWR
NC
NC
Semiconductor
MSM9552/MSM9553
4
PIN DESCRIPTION
Function
Symbol
Pin
Type
Description
Micro-
controller
interface
WR
16
I
Write signal to internal register
RD
18
I
Read signal to internal register
INT
15
O
Interrupt signal to microcontroller. "L": Occurrence of an
interrupt
CS
31
I
Chip select signal.
"L": Read, write, and data bus signals valid
CLR
40
I
"L" initializes internal registers, and the device enters
power down mode
A0 to A5
33 to 38
I
Address signal to internal register
DB0 to DB7
19 to 26
I/O
Data bus signal to internal register
A
IN
6
I
FM multiplex signal input
SG
5
O
Analog reference voltage output pin. To prevent noise,
connect a capacitor between this pin and analog ground.
MON
1
O
Analog section waveform monitor pin. The analog block is
specified by the analog control register.
ADETIN
2
I
Analog signal input pin for testing
IORD
IOWR
41
42
I
Digital section test signal input pins. Internally pulled up.
MOUT0 to
MOUT6
8 to 14
O
Digital section test signal output and monitor output pins
XTAL1
29
I
8.192MHz crystal oscillator connection pin
XTAL2
30
O
8.192MHz crystal oscillator connection pin
XOUT
32
O
Pin for supply of 64kHz to 8.192MHz clock to the outside
XOUTC
7
I
XOUT output control pin.
"L"=Clock output, "H"=Output disabled. Pulled up internally.
AV
DD
3
--
Analog section power supply pin
AGND
4
--
Analog ground pin
DV
DD
28
--
Digital section power supply pin
DGND
27
--
Digital ground pin
Tuner
interface
Analog
section test
Digital
section test
Clock
Power
supply
5
MSM9552/MSM9553
Semiconductor
ABSOLUTE MAXIMUM RATINGS (MSM9552)
Parameter
Symbol
Condition
Rating
Unit
Power supply voltage
AV
DD
=DV
DD
Ta=25C
AV
DD
DV
DD
0.3 to +7.0
V
Input voltage
Output voltage
V
I
V
O
0.3 to AV
DD
+0.3
0.3 to DV
DD
+0.3
Maximum power dissipation
Ta=25C per package
P
D
400
mW
Ta=25C per output
50
Storage temperature
--
T
STG
55 to +150
C
RECOMMENDED OPERATING CONDITIONS (MSM9552)
Parameter
Symbol
Condition
Range
Unit
Power supply voltage
AV
DD
=DV
DD
AV
DD
DV
DD
4.5 to 5.5
V
Applied Pin
AV
DD
DV
DD
Crystal frequency
--
f
XTAL
8.192MHz 100ppm
--
XTAL1
XTAL2
FM multiplex signal input
voltage
Composite signals,
including multiplex
signals
V
AIN
0.5 to 2
V
P-P
A
IN
Operating temperature
--
T
OP
40 to +85
C
--
ELECTRICAL CHARACTERISTICS (MSM9552)
Parameter
Symbol
Condition
Min.
Unit
Current consumption
During operation, No load
f=8.192MHz
I
DD
--
Applied Pin
AV
DD
DV
DD
Typ. Max.
16
32
mA
During power down, No load
--
--
20
mA
BPF pass band attenuation
72 - 80kHz
Variable gain amplifier
gain: 0dB
GAIN1
--
MON
--
3.0
dB
BPF reject band attenuation
0 - 53kHz
Variable gain amplifier
gain: 0dB
GAIN2
50
MON
--
--
dB
BPF reject band attenuation
100 - 500kHz
Variable gain amplifier
gain: 0dB
GAIN3
50
MON
--
--
dB
Semiconductor
MSM9552/MSM9553
6
ABSOLUTE MAXIMUM RATINGS (MSM9553)
RECOMMENDED OPERATING CONDITIONS (MSM9553)
ELECTRICAL CHARACTERISTICS (MSM9553)
Parameter
Symbol
Condition
Rating
Unit
Power supply voltage
AV
DD
=DV
DD
Ta=25C
AV
DD
DV
DD
0.3 to +7.0
V
Input voltage
Output voltage
V
I
V
O
0.3 to AV
DD
+0.3
0.3 to DV
DD
+0.3
Maximum power dissipation
Ta=25C per package
P
D
400
mW
Ta=25C per output
50
Storage temperature
--
T
STG
55 to +150
C
Parameter
Symbol
Condition
Range
Unit
Power supply voltage
AV
DD
=DV
DD
AV
DD
DV
DD
2.7 to 3.3
V
Applied Pin
AV
DD
DV
DD
Crystal frequency
--
f
XTAL
8.192MHz 100ppm
--
XTAL1
XTAL2
FM multiplex signal input
voltage
Composite signals,
including multiplex
signals
V
AIN
0.2 to 0.9
V
P-P
A
IN
Operating temperature
--
T
OP
20 to +75
C
--
Parameter
Symbol
Condition
MIN
Unit
Current consumption
During operation, No load
f=8.192MHz
I
DD
--
Applied Pin
AV
DD
DV
DD
TYP MAX
13
22
mA
During power down, No load
--
--
10
mA
BPF pass band attenuation
72 - 80kHz
Variable gain amplifier
gain: 0dB
GAIN1
--
MON
--
3.0
dB
BPF reject band attenuation
0 - 53kHz
Variable gain amplifier
gain: 0dB
GAIN2
50
MON
--
--
dB
BPF reject band attenuation
100 - 500kHz
Variable gain amplifier
gain: 0dB
GAIN3
50
MON
--
--
dB
(1)
(2)
7
MSM9552/MSM9553
Semiconductor
APPLICATION CIRCUIT
FM
tuner
FM multiplex
data demodulation
LSI
MSM9552
8 bits
CPU
ROM
Buffer
RAM
Font
ROM
16 Chinese
characters
x 2 lines
LCD display
LCD control
driver
LCD driver with built-in 128-channel
RAM for liquid crystal dot matrix
MSM6794:
MSM6794 x 2
MCU
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