SC50462
INFRARED REMOTE CONTROL TRANSMITTER OF 50462 CODE FORMAT
DESCRIPTION
The SC50462 is a remote control transmitter utilizing CMOS
technology specially designed for use on infrared applications. It has 64
functions and a total of 76 commands can be transmitted. Housed in 24
pins DIP package, SC50462 has 2 address bits.
FEATURES
* High performance CMOS technology
* Low power consumption
* Least external components.
* Up to 76 instructions
* Double key operation is possible.
APPLICATIONS
* Television remote control transmitter
* Video cassette recorder(VCR) remote control transmitter
ORDERING INFORMATION
Device
SC50462
SC50462S
Package
SDIP-24-300-2.54
SOP-24-375-1.27
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Key encoder
REV:2.2
2005.12.15
Page 1 of 12
SC50462
ABSOLUTE MAXIMUM RATINGS
(T
amb
=25°C)
Characteristic
Supply Voltage
Input Voltage
Output Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
V
CC
V
IN
V
OUT
P
D
T
opr
T
stg
-0.3 ~ 5.5
V
ss
-0.3V ~ V
CC
+0.3V
V
ss
~ V
CC
300
-10 ~ +70
-40 ~ +125
Ratings
Unit
V
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(T
amb
=25°C,V
CC
=3.0V,V
ss
=0,Unless otherwise specified)
Parameter
Operating Supply Voltage
Operating Supply Current
Stand-by Current
High level Output Current(
OUT
)
Low level Output Current(
OUT
)
High level Output Current(
CNTR
)
Low level Output Current(
CNTR
)
Symbol
V
CC
I
CC1
I
CC2
I
OH
I
OL
I
OH
I
OL
V
OH
=2V
V
OL
=1V
V
OH
=2V
V
OL
=1V
5
-3
1
-3
Test Conditions
T
amb
=20 ~ 70°C
f
osc
=455kHz
Min
1.8
Typ
3
Max
5
0.3
1
Unit
V
mA
µA
mA
mA
mA
mA
PIN CONFIGURATION
Vss
OSCI
OSCO
CNTR
I1
I2
I3
I4
I5
1
2
3
4
5
24 Vcc
23 OUT
22 C5
21 C4
20 S8
SC50462
6
7
8
9
19 S7
18 S6
17 S5
16 S4
15 S3
14 S2
13 S1
I6 10
I7 11
I8 12
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2005.12.15
Page 2 of 12
SC50462
PIN DESCRIPTION
Pin No.
1,24
2,3
4
5~12
13~20
21,22
23
Pin Name
V
SS
, V
CC
OSCI,OSCO
CNTR
Description
Power Supply: V
CC
=3.0V,V
SS
=0V
Oscillator Input/Output Pin, 455 or 480kHz Crystal is connected between these
pins.
Transmitting Indicator. An LED and resistor are connected from this pin to Vcc.
Key Scan Signal Input pins.
Key Scan Signal Output pins.
Custom Code
Modulation Pin
I1~I8
S1~S8
C4 , C5
OUT
FUNCTIONAL DESCRIPTION
SC50462 is a sending signal IC on infrared remote control. Consisting of timing generating circuit, scan signal
generating circuit, key input encoder, instruction decoder, custom code circuit, code encoder, and output buffer. It
has 8*8 key matrix input and custom code with 16 bit PCM which shows 76 instructions.76Instruction are devided
in 64 one shot signal and 12 2-shot signal.
When Input Signal(I1~I8) and/or in combination with the Scan Signals(S1~S8) are activated, SC50462 checks
the ID and the Custom Code Bits--
C4
and
C5
--setting before finally sending out the remote control signal.
1.
CNTR
OUTPUT
The
CNTR
Pin is the LED transmission Indicator. This means that Whenever a valid transmission is sent, the
LED lights up. The
CNTR
output becomes “ in the 7
th
pulse-rising and “ in the 17
th
pulse-rising.
L”
H”
Note: Oscillator Frequency=480 or 455kHz
2. OSCILLATING CIRCUIT
An oscillator circuit may be constructed by using a 480kHz or 455kHz Crystal Resonator and two capacitors.
Please refer to the following diagram. The carrier frequency transmitted is 40kHz or 37.9kHz.Unless any legal
key input is activated, the oscillation is automatically stopped. Thus ,power consumption is considerably reduced.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2005.12.15
Page 3 of 12
SC50462
3. KEY INPUT
A total of 64 keys may be connected by Input Pins(I1~I8) and Output Pins(S1~S8) to form an 8x8 Key Matrix.
Double key operation is possible for only one of the keys— SW25~SW28 in combination with any one of the keys
–SW11~SW13. Any other key combination are regards as illegal and will not generate any activity. Thus, only the
following key combinations may be used for the doubled key operation:
I8
S1
S2
S3
S4
SW25
I7
I6
I5
I4
I3
I2
I1
SW11
SW12
SW13
Note:
SC50462 permits two keys function but
only “ ”key are allowed.
When you push one key of SW11/12/13,
you can push with another key of
SW25/26/27/28. Otherwise, other
conditions are illegal.
S5
SW26
S6
SW27
S7
SW28
S8
SW25 and SW11
SW25 and SW12
SW25 and SW13
SW27 and SW11
SW27 and SW12
SW27 and SW13
SW26 and SW11
SW26 and SW12
SW26 and SW13
SW28 and SW11
SW28 and SW12
SW28 and SW13
4. TRANSMISSION CODE
The transmission Code consists of 16 bits, namely: 8 bits custom code(C0~C7 ) and 8 bits data code (D0~D7).
Please refer to the table below:
C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7
Custom Code
Data Code
One frame of the Transmission Code
If a Single Shot Key is depressed, data Codes— D6 and d7 will be given the value of (0,0).Please refer to the
table1.If a valid double key operation is performed, the data codes will receive the values described in Table 2.
Table 1: Key Matrix/Code
Scan Output
S1
S2
S3
S4
S5
S6
S7
S8
Data
D0
0
1
0
1
0
1
0
1
D1
0
0
1
1
0
0
1
1
D2
0
0
0
0
1
1
1
1
REV:2.2
Octal display
0
1
2
3
4
5
6
7
2005.12.15
Page 4 of 12
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
SC50462
Data
D3
0
1
0
1
0
1
0
1
D4
0
0
1
1
0
0
1
1
D5
0
0
0
0
1
1
1
1
Key Input
I1
I2
I3
I4
I5
I6
I7
I8
Octal display
0
1
2
3
4
5
6
7
Table 2: Double Key Signal/Code
Scan Output
S1/I1
(SW1
1)
S5/I2 (SW25)
S6/I2 (SW26)
S7/I2 (SW27)
S8/I2 (SW28)
S2/I1
(SW1
2)
S5/I2 (SW25)
S6/I2 (SW26)
S7/I2 (SW27)
S8/I2 (SW28)
S5/I2 (SW25)
S6/I2 (SW26)
S7/I2 (SW27)
S8/I2 (SW28)
5. CUSTOM CODE
SC50462 has a total of 8 bits custom code (C0~C7). Custom Code Bits –C4 and C5 can be externally selected
using the
C4
and
C5
Terminals. The
C4
and
C5
pins are inversed; therefore, if the
C4
and
C5
terminals are
pulled HIGH, then the Custom Code Bits— C4 and C5 would have the Value(0,0). Likewise, when pulled LOW,
then C4 and C5 bits will be (1,1),The other Customs Code Bits,namely:C0~C3 and C6,C7 are fixed at (1,1,1,0)
and (1,0 ):
The waveform of bits are given below:
0.25/0.26ms
Data Code
D0
0
1
0
1
0
1
0
1
0
1
0
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
D2
1
1
1
1
1
1
1
1
1
1
1
1
D3
1
1
1
1
1
1
1
1
1
1
1
1
D4
0
0
0
0
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
0
0
0
0
D6
1
1
1
1
0
0
0
0
1
1
1
1
D7
0
0
0
0
1
1
1
1
1
1
1
1
D0~D2
4
5
6
7
4
5
6
7
4
5
6
7
Octal Display
D3~D5
1
1
1
1
1
1
1
1
1
1
1
1
D6~D7
1
1
1
1
2
2
2
2
3
3
3
3
S3/I1
(SW1
3)
Bit "0"
1.00/1.05ms
Bit "1"
2.00/2.10ms
Note: Oscillator Frequency=480 or 455kHz
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2005.12.15
Page 5 of 12
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