Silan
Semiconductors
REMOTE CONTROL ENCODER
DESCRIPTION
The SC5262 is a remote control encoder paired with SC5272
utilizing CMOS technology. It encodes data and address pins into a
serial coded waveform suitable for RF or IR modulation. SC5262
has a maximum of 12-bits of tri-state address pins providing up to
531,441(or 3
12
) address codes; thereby, drastically reducing any
code collision and unauthorized code scanning possibilities.
SC5262
DIP-18
FEATURES
* Low power consumption and very high noise immunity
* Up to 12 tri-state code address pins or 6 data pins
* Wide operating voltage range(Vcc=3V ~ 15V)
* Single resistor oscillator
* Latch or Momentary output type
SOP-20
APPLICATION
* Home/automation security system
* Remote control toys or for industrial use
* Remote control fan
* Garage door controller
DIP-20
ORDERING INFORMATION
SC5262X-XX
RF: RF Applicatant, normally omitted
IR: IR Applicatant
S: SOP-20 Package
D: DIP-20 Package
Omitted: DIP-18 Package
PIN CONFIGURATION
A0
A1
A2
A3
18 Pin
Package
20 Pin
Package
A4
A5
A6/D5
A7/D4
Vss
NC
1
Vcc
Dout
OSC1
OSC2
SC5262
TE
A11/D0
A10/D1
A9/D2
A8/D3
NC
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
1
Silan
Semiconductors
BLOCK DIAGRAM
OSC2 OSC1
TE
Dout
SC5262
14
17
15
16
18
Vcc
OSC
System
Timing
Control
Logic
Code
Generation
9
Vss
Address
1
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6/
D5
8
A7/
D4
10
A8/
D3
11
A9/
D2
12
13
A10/ A11/
D1 D0
The block diagram is for DIP-18(hereinafter is the same)
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C )
Characteristic
Supply Voltage
Input Voltage
Output Voltage
Maximum Power Dissipation(Vcc=12V)
Operating Temperature
Storage Temperature
Symbol
Vcc
Vi
Vo
Pa
Topr
Tstg
Value
-0.3 ~ 16.0
-0.3 ~ Vcc+0.3
-0.3 ~ Vcc+0.3
300
-20 ~ +70
-40 ~ +125
Unit
V
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(Ta=25°C,Vcc=12V,unless otherwise specified)
Characteristic
Supply Voltage
Supply Current
Symbol
Vcc
Icc
Test Condition
Vcc=12V,OSC stops
A0~ A11 Open
Vcc=5V,V
OH
=3V
Vcc=8V,V
OH
=4V
Vcc=12V,V
OH
=6V
Vcc=5V,V
OL
=3V
Vcc=8V,V
OL
=4V
Vcc=12V,V
OL
=6V
Min
3
Typ.
0.02
Max
15
0.3
Unit
V
µA
mA
mA
mA
mA
mA
mA
Dout Output driving Current
I
OH
Dout Output sinking Current
I
OL
-3
-6
-10
2
5
9
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
2
Silan
Semiconductors
PIN DESCRIPTION
Pin No.
18 PIN
20 PIN
1~6
1~6
SC5262
I/O
I
Pin Name
A0~A5
Description
Code Address pins No. 0~5. These six tri-state pins are
detected by SC5262 to determine the encoded waveform
bit 0 ~bit 5. Each pin can be set to “0”,”1”,”f”(floating).
Code Address pinsNo.6~11/data pins No.5~0. These six
tri-state pins are detected by SC5262 to determine the
encoded waveform bit 6 ~bit 11.When these pins are used
as address pins, they can be set to “0”,”1”,”f”.When they
are used as data pins ,they can be set only to “0”,”1”.
Transmission Enable. Active Low Signal.SC5262 outputs
the encoded waveform to DOUT when this pins is pulled to
LOW.
A resistor connected between
Oscillator Pin No.1
these two pins determine the
Oscillator Pin No.2
fundamental frequency of SC5262.
Data Output Pin. The encoded waveform is serially
outputted to this pin. When SC5262 is not transmitting,
DOUT outputs low(Vss) voltage.
Positive Power Supply
Negative Power Supply
Not Connected
7~8
10~13
7~8
12~15
A6/D5~A11/D0
I
14
15
16
17
18
9
--
16
17
18
19
20
9
10~11
TE
I
O
I
O
--
--
--
OSC1
OSC2
DOUT
Vcc
Vss
NC
FUNCTIONAL DESCRIPTION
The SC5262 encodes the code address and data set at A0~ A5 and A6/D5 ~ A11/D0 into a special waveform
and outputs it to the Dout when
TE
is pulled to “0” (Low state). This waveform is fed to either the RF modulator or
the IR transmitter for transmission. The Transmitted radio frequency or infrared ray is received by the RF
demodulator or IR receiver and reshaped to the special waveform. SC5272 is then used to decode the waveform
and set the corresponding output pins. Thus completing a remote control encoding and decoding function.
1. RF OPERATION
Code Bits
A code bit is the basic component of the encoded waveform, and can be classified as either an AD(Address/Data)
Bit or a SYNC(Synchronous) Bit.
An AD bit can be designated as bit “ 0 ”, “ 1 ” or “ f ” if it is in low, high or floating state respectively. One bit
waveform consists of two pulse cycles. Each pulse cycle has 16 oscillating time periods. For further details, please
refer to the diagram below:
The Synchronous bit waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below:
1/8 bit width=4a
4 bit width=128a
Note: 1bit =32a
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
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Silan
Semiconductors
Code word
SC5262
A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync. Bit. The
12 AD bits are determined by the corresponding states of A0~A5 and A6/D5 ~ A11/D0 pins at the time of
transmission. When Data Type of SC5262 is used , the address bits will decrease accordingly. For example, in the
3 Data Type where the address has 9 bits, the transmitting format is:
9 address bits
3 Data bits
Sync. Bit
SC5262/SC5272 has a maximum of 12 Address Bits including the 6 Address/Data bits. The following diagram
shows the code bits with their corresponding pins.
A0
A1
A2
A3
A4
A5
A6
/D5
A6
A6
A6
A6
A6
A6
D5
A7
/D4
A7
A7
A7
A7
A7
D4
D4
A8
/D3
A8
A8
A8
A8
D3
D3
D3
A9
/D2
A9
A9
A9
D2
D2
D2
D2
A10
/D1
A10
A10
D1
D1
D1
D1
D1
A11
/D0
A11
D0
D0
D0
D0
D0
D0
Sync
Sync
Sync
Sync
Sync
Sync
Sync
0 Data
1 Data
2 Data
3 Data
4 Data
5 Data
6 Data
A0
A0
A0
A0
A0
A0
A0
A1
A1
A1
A1
A1
A1
A1
A2
A2
A2
A2
A2
A2
A2
A3
A3
A3
A3
A3
A3
A3
A4
A4
A4
A4
A4
A4
A4
A5
A5
A5
A5
A5
A5
A5
The Code Bits A0~A5 and A6/D5 ~ A11/D0 are determined by the states of A0 ~ A5 and A6/D5 ~A11/D0 pins.
For example, when the A0(pin 1) is set to “ 1 ”(Vcc), the code bit A0 is synthesized as “ 1 ” bit. In the same manner,
when it (A0 pin) is set to “ 0 ”( Vss) or left floating, the Code Bit A0 is synthesized as a “ 0 ” or “ f ” bit respectively.
Code Frame
A Code Frame consists of 4 continuous code Words. When SC5262 detects “0” on the
TE
(meaning , the
TE
is active “low”), it outputs a Code frame at Dout. If
TE
is still active at the time the Code Frame transmission ends.
SC5262 outputs another Code Frame. It should be noted that the Code Frame is synthesized at the time of
transmission.
TE
1 frame(=4 word)
1 frame
1 frame
Dout
Single Resistor Oscillator
The Build-in oscillator circuitry of SC5262 allows a precision oscillator to be constructed by connecting an
external resistor between OSC1 and OSC2 pins. For SC5272 to decode correctly the received waveform, the
oscillator frequency of SC5272 must be 2.5 ~8 times that of transmitting SC5262. The typical oscillator frequency
with various resistor values for both SC5262 and SC5272 are shown below:
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
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Silan
Semiconductors
Encoder OSC Frequency
100
1000
SC5262
Decoder OSC Frequency
R=100k
R=240k
R=510k
R=1M
Frequency (kHz)
R=2M
R=3.3M
10
Frequency (kHz)
100
R=510k
R=1M
R=2M
R=4.7M
10
1
0
3
6
9
12
15
1
0
3
6
9
12
15
Supply Voltage (V)
Supply Voltage (V)
Suggested Oscillator resistor values are shown below:
SC5262
4.7M
3.3M
1.2M
SC5272
820k
680k
200k
2. IR OPERATION
In the IR Type of operation, the functions are similar to the above descriptions except for the output waveform
that has a carrier frequency of 38kHz. Details are as follow.
Code Bits
The Code Bits are further modulated with a 38kHz carrier frequency and can be”0”,”1” or “ f ” bit. Their waveform
are shown below:
160λ
OSC
20λ
"0"
60λ
"1"
"f"
Sync
620λ
Note:λ=2 clock lengths
Code Word
A Code Word is made up of code bits and the format is the same as that of the RF Code Word.
Code Frame
Likewise, a Code Frame is made up of Code Words and the format is the same as that of RF type of operation.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
5
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