Silan
Semiconductors
INFRARED REMOTE CONTROL
TRANSMITTER
DESCRIPTION
The
SC50560 is a remote control transmitter utilizing CMOS
SC50560
SOP-20
technology housed in a 20-pin DIP or SO package. A 4x8 key matrix
and extension bit inputs allow the transmission of up to 256
instructions. The transmission code consists of 16 bits code (8 bits
custom code and 8 bits data code) and a leader code.
Pin assignments and application circuit of SC50560 are optimized
for easy PCB layout and cost saving advantage for remote control
applications.
DIP-20
FEATURES
* CMOS technology
* Low power consumption
* Least external components
* LED power dissipation is less during the transmission of
instructions
ORDERING INFORMATION
SC50560
SC50560S
DIP-20 Package
SOP-20 Package
APPLICATIONS
* Audio Equipment
* Television
* Video Cassette Recorder
* Air Condition
PIN CONFIGURATION
Vss
TEST
SEL
OSCI
OSCO
CS
KIO0
KIO1
KIO2
1
2
3
4
5
6
7
8
9
SC50560
20 V
DD
19 D
OUT
18 KO0
17 KO1
16 KO2
15 KO3
14 KO4
13 KO5
12 KO6
11 KO7
KIO3 10
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.3
2002-03-21
1
Silan
Semiconductors
BLOCK
DIAGRAM
KIO0
KIO1
KIO2
KIO3
CS
7
8
9
10
SC50560
VDD
20
VSS
1
OSCI
4
OSCO
5
Scan
Key
Input
Oscillation
Circuit
Timing
Generator
Test Circuit
2
TEST
19
DOUT
Data Encoder
6
Code
Transfer
Output
Controller
3
SEL
Scan Signal Generating Circuit
18
17
16
15
14
13
12
11
S1 S2 S3 S4 S5 S6 S7 S8
ABSOLUTE MAXIMUM RATINGS
(Tamb=25°C)
Characteristic
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Storage Temperature
Symbol
V
CC
V
IN
V
OUT
Topr
Tstg
Value
-0.3 ~ 5.5
Vss-0.3V ~ V
DD
+0.3V
Vss
≤
Vo
≤
V
DD
-20 ~ 70
-40 ~ +125
Unit
V
V
V
°C
°C
ELECTRICAL CHARACTERISTICS
(Tamb=25°C,
Parameter
Supply Voltage
Operating Current
Stand-by Current
High level Output Current (Dout)
Low Level Output Current
(Dout, KO0~KO7)
High Level Input Voltage (CS)
(KIO0~KIO3)
Low Level Input Voltage (CS)
(KIO0~KIO3)
Input Pull-High Resistance
(KIO0~KIO3)
V
DD
=3.0V,Vss=0,Unless otherwise specified)
Symbol
V
DD
I
OP
I
SB
I
OH
I
OL
I
KO0~KO7
V
IH
Test Conditions
Fosc =455KHz
Fosc =455KHz
OSCO =V
DD
KIO0~KIO3= V
DD
TEST = Vss SEL = Vss
V
OH
=2V
V
OL
=0.9V
Min
2.0
Typ
3.0
0.12
0.1
Max
4.0
0.3
1
Unit
V
mA
µA
mA
mA
-1.0
0.5
4.5
-13
1.2
5.3
V
DD
V
DD
=3.0V
0.7 V
DD
V
V
IL
V
DD
=3.0V
0
0.3V
DD
V
R
IN
V
DD
=3.0V
55
70
85
kΩ
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.3
2002-03-21
2
Silan
Semiconductors
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7~10
18~11
19
20
SC50560
Description
Negative Power Supply
Test Pin. This pin is normally connected to VSS.
Select Pin for SC50560-001/003.
Oscillation Input Pin
Oscillation Output Pin
Code Select Pin
Input/Output Pins
Scan Output Pins
Output Pin
Positive Power Supply
Pin Name
V
SS
TEST
SEL
OSCI
OSCO
CS
KIO0~KIO3
KO0~KO7
Dout
V
DD
Input/output
--
I
I
I
O
I
I/O
O
O
--
FUNCTIONAL DESCRIPTION
SC50560 is capable of transmitting up to 256 different instructions and 8 bits custom codes using a 16-bit PCM
Code with a leader code. Furthermore, oscillation is normally stopped when there is no operating, thereby, lower
power dissipation.
1. TRANSMISSION CODE
SC50560 transmission code consists of a leader code, 8 bits custom code (C0 to C7) followed by a sync. bit
and 8 bits data code (D0 to D7) followed another sync. bit. The custom and the data codes are separated by a
separator. Please refer to the diagram below:
C1 C2 C3 C4 C5 C6 C7 SYNC
Leader Pulse
8 Bits Custom Code
Sync. Bit
Seperator
D0 D1 D2 D3 D4 D5 D6 D7 SYNC
8 Bits Data Code
Sync. Bit
Figure 1. SC50560 Transmission Code Format
One transmission Code Word consists of a 19-bit pulse (that is the leader pulse plus the 16 bits code) and the
separator. It is transferred in a 63.4ms for as long as the key is depressed. Please refer to the diagram below:
8BITS CUSTOM CODE
LEADER CODE
C0
C1 C2
C3 C4 C5 C6 C7
SEPARATOR
SYNC
D0 D1
8BITS DATA CODE
D2 D3 D4 D5 D6 D7
SYNC
8.4ms
4.2ms
ONE CODE WORD
63.4ms
4.2ms
Figure 2. SC50560 Detailed Code Word Format
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.3
2002-03-21
3
Silan
Semiconductors
LEADER CODE
SC50560
The leader code is located at the beginning of the transmission code and is made up of 8.4ms HIGH & 4.2ms
LOW pulse and is modulated in 38KHz providing easy identification of the reception code head bit at the receiver.
CUSTOM CODE
Custom Code may be selected by connection CS Input with Scan Output (KO0 to KO4). An example of a
custom code selection is shown in the diagram below.
CS
KO0
KO1
KO2
KO3
KO4
6
18
17
16
15
14
Custom Code
C0
1
C1
0
C2
1
C3
0
C4
1
C5
0
C6
0
C7
0
Figure 3. custom Code Selection Example
DATA CODE
D0 to D7 of the transmission code are the data code bits. When CS Input and the Scan Output (KO5 to
KO7) are connected, data bits—D5 to D7 becomes the system extended code bits. An example of the
Extended code Bits Selection is given in the diagram below:
CS
KO5
KO6
KO7
6
18
17
16
Data Code
SW = OFF
SW = ON
D5
1
1
D6
0
0
D7
0
1
Figure 4. Extended Code Selection
2. SEPARATOR
The separator demarcates the custom code and the data code. It consists of a 4.2ms LOW pulse interval and
can be determined at the receiver so theat any interference with other remote control system may be avoided.
Please refer to Figure 2.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.3
2002-03-21
4
Silan
Semiconductors
3. CARRIER
SC50560
The carrier of the transmission signal is 38KHz and one pulse width is 0.52ms. Therefor, with the exception of
the leader code, there are twenty 38KHz clock in one pulse width. Please refer to the diagram below.
0.52ms
8.7µs
26.3µs
Figure 5. Transmission Signal Carrier Diagram
4. KEY INPUT
By connecting the input pins – KI0 to KI3 and scan output pins –KO0 to KO7 (also known as the Standard Keys),
a 4x8 key matrix may be formed. Likewise, a maximum of 256 instructions may be provided by connecting the input
CS with the scan output –KO0 to KO7 (also known as the Extended Keys). When two or more standard keys are
pressed, the transmission output Dout is kept at LOW and no transmission code is outputted. Please refer to the
tables below.
Data
Key Input
KI0
KI1
KI2
KI3
D0
0
1
0
1
D1
0
0
1
1
Data
Scan Output
KO0
KO1
KO2
KO3
KO4
KO5
KO6
KO7
D2
0
1
0
1
0
1
0
1
D3
0
0
1
1
0
0
1
1
D4
0
0
0
0
1
1
1
1
Data
CS Input
KO5
KO6
KO7
D5
1
--
--
D6
--
1
--
D7
--
--
1
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.3
2002-03-21
5
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