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Silan Semiconductors
REMOTE CONTROL DECODER
DESCRIPTION
The SC5272 is a remote control decoder paired with SC5262 utilizing CMOS technology. It has a maximum of 12-bits of tri-state address pins providing up to 531,441(or 312) address codes; thereby, drastically reducing any code collision and unauthorized code scanning possibilities.
SC5272
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
DIP-20
APPLICATION
* Home/automation security system * Remote control toys or for industrial use * Remote control fan * Garage door controller
ORDERING INFORMATION
SC5272X-XX
Data Bits: 0: 0 data bit(can be omitted) 2: 2 data bits 3: 3 data bits 4: 4 data bits 5: 5 data bits 6: 6 data bits L: Latch Type M: Momentary Type S: SOP-20 Package D: DIP-20 Package Omitted: DIP-18 Package
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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PIN CONFIGURATION
SC5272
A0 A1 A2 A3 A4 A5 A6 A7 Vss NC
1
Vcc VT OSC1 OSC2
A0 A1
1
Vcc VT
A3 A4 A5 A6 A7 Vss NC
SC5272-M2/L2
A2
OSC1 OSC2 Din D0 D1 A9 A8 NC
SC5272
Din A11 A10 A9 A8 NC
A0 A1 A2
1
Vcc VT OSC1
A0 A1 A2 A3 18 Pin Package 20 Pin Package A4 A5 A6 A7 Vss NC
1
Vcc VT OSC1
SC5272-M3/L3
SC5272-M4/L4
A3 A4 A5 A6 A7 Vss NC
OSC2 Din D0 D1 D2 A8 NC
OSC2 Din D0 D1 D2 D3 NC
A0 A1 A2
1
Vcc VT OSC1
A0 A1 A2 A3 A4 A5 D5 D4 Vss NC
1
Vcc VT OSC1
SC5272-M5/L5
SC5272-M6/L6
A3 A4 A5 A6 D4 Vss NC
OSC2 Din D0 D1 D2 D3 NC
OSC2 Din D0 D1 D2 D3 NC
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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BLOCK DIAGRAM
OSC2 OSC1
SC5272
VT 17 18 Vcc Sync. Detect Control Logic Compare Logic 9 Vss Data Detect
15
16
Output Logic OSC
System Timing
Tri-stateAddress Data Detect
1 A0
2 A1
3 A2
4 A3
5 A4
6 A5
7 A6
8
10
11
12
13
14 Din
A7 A8 A9 A10 A11
The Pin configurations are for DIP-18 package and are also some different with the SC5272 suffix (please refer to the Pin Configuration)
ABSOLUTE MAXIMUM RATINGS(Ta=25C )
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=25C,Vcc=12V,unless otherwise specified)
Characteristic
Supply Voltage Supply Current
Symbol
Vcc Icc
Test Condition
Vcc=12V,OSC stops A0~ A11 Open Vcc=5V,VOH=3V Vcc=8V,VOH=4V Vcc=12V,VOH=6V Vcc=5V,VOL=3V Vcc=8V,VOL=4V Vcc=12V,VOL=6V
Min
3
Typ.
0.02
Max
15 0.3
Unit
V A mA mA mA mA mA mA V V
Dout Output driving Current
IOH
Dout Output sinking Current Input High Voltage Input Low Voltage
IOL VIH VIL
-3 -6 -10 2 5 9 0.7Vcc 0
Vcc 0.3Vcc
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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PIN DESCRIPTION
Pin No. 18 PIN 20 PIN
1~6 1~6
SC5272
I/O
I
Pin Name
A0~A5
Description
Code Address pins No. 0~5. These six tri-state pins are detected by SC5272 to determine the encoded waveform bit 0 ~bit 5. Each pin can be set to "0","1","f"(floating). Code Address pins No.6~11/data pins No.5~0. These six pins are used higher address input bits or data output pins depending on the versions of SC5272 used.When these pins are used as address pins, they are tri-state input pins and can be set to "0","1","f".When they are used as output pins, they are driven to Vcc if (1) the address decoded from the waveform that was received matches the address setting at address input pins, and (2) the corresponding data bits received is a "1" bits. Otherwise, they are driven to Vss. Data Input Pin. The encode waveform received is serially fed to SC5272 at this pin. A resistor connected between Oscillator pin 1 these two pins determine the Oscillator pin 2 fundamental frequency of SC5272. Valid Transmission. Active high signal. VT in high state signifies that SC5272 receives valid transmission waveform. Positive Power Supply Negative Power Supply No Connection
7~8 10~13
7~8 12~15
A6/D5~A11/D0
I/O
14 15 16 17 18 9 --
16 17 18 19 20 9 10~11
DIN OSC1 OSC2 VT Vcc Vss NC
I I O O ----
FUNCTIONAL DESCRIPTION
The SC5272 decodes the waveform received and fed into the Din pin. The waveform is decoded into code word that contains the address, data and Sync bits. The decoded address bits are compared with the address set at the address input pins. If both addresses match for 2 consecutive code words, SC5272 drives: a). The data output pins whose corresponding data bits is then decoded to be a "1" bit b). The VT output --to high voltage (high state).
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:
32a a
OSC bit "0" bit "1" bit "f"
4a 12a
12a 4a
Where: a = oscillating clock period .
Bit " f " is only available for address bits.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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SC5272
1/8 bit width=4a
The Synchronous bit waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below:
4 bit width=128a Note: 1bit =32a
Code word
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 interpreted as either address or data bits depending on the SC5272 version used. Please refer to the diagram below: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 SYNC
Single Resistor Oscillator
The Build-in oscillator circuitry of SC5272 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. It is a good practice to center the SC5272 oscillator frequency in the window to gain best window margin at both sides. The typical oscillator frequency with various resistor values for both SC5262 and SC5272 are shown below:
Encoder OSC Frequency
100 1000
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
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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2. IR OPERATION
SC5272
In the IR Type of operation, the functions are similar to the above descriptions except that the output waveform carried by SC5262-IR has a frequency of 38kHz. Details are as follows.
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:
160
OSC
20
"0"
60
"1" "f" Sync
620
Note:=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.
Oscillator
The SC5262-IR is specially designed for infrared remote control applications and its output waveform carries 38kHz frequency. To get the 38kHz carrier frequency at the data output, the oscillator frequency must be 76kHz. A 440k resistor connected between OSC1 and OSC2 pins of SC5262-IR is recommended. Moreover, for a matching decoder frequency, 1M resistor connected between the OSC1 and OSC2 pins of SC5272 is also recommended.
3.VALID TRANSMISSION
When the SC5272 receives a transmission code word, it initially checks whether this is a valid transmission. For a transmission to be valid, (1) it must be a complete code word, and (2) the address bits must match the address setting at the address pins. After two consecutive valid transmission, SC5272 (1) drives the data pins according to the data bits received, and (2) rise VT to high voltage(high state). The timings are shown in the following diagram.
Sync bit 1st word 2nd word Sync bit
Din Data pins (momentary) VT
Ta= 8 OSC clock width Tb= 1 OSC clock width Tc=2 code word width
Ta Tc Tb
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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4.LATCH OR MOMENTARY DATA OUTPUT TYPE
SC5272
The SC5272 uses either the latch or momentary data output type depending on the SC5272 version used. The latch type SC5272-LXactivates the data out during transmission and this data is sustained in the memory until another data is inputted or entered. A momentary type(SC5272-MXon the other hand, activates the data out only during transmission. In the momentary type, the data does not remain in the memory after the transmission is completed. Please refer to the diagram below:
Din Data Pins (Momentary) Data Pins (Latch) VT
Data Words
T
Data Words
T
Data Output X
Data Output Y
Data Output X
Data Output Y
OPERATION FLOW CHART
Decoder Without Data Output Pin
1. When the power is turned on, the SC5272 activates the Stand-By Mode. 2. It then search for signals, If there is no signal received, it remains in the Stand-By Mode; otherwise, the address bits received are compared with the address configuration of the pins. 3. The VT goes high signifying the validation of transmission only when there are two continuous frames that contain matched address bit; otherwise, VT will not be activated and the Stand-By Mode remains active. 4. Then , the address bits are again checked. Two continuous mismatches of the address bits would disable the VT and make the Stand-By Mode active; otherwise, the address bits are continuous checked.
Power ON
Stand-By Mode
No
Singal IN ? Yes Address bits match? Yes Address bits match? Yes Activate VT No No
Disable VT
Yes
Address bits still match? No
Yes
Address bits still match?
No
Decoder Without Data Output Pin
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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Decoder With Data Output Pins
SC5272
1. When the power is turned on ,the SC5272 activates the Stand-By Mode. 2. It then searches for signal. If there is no signal received , it remains in the Stand-By Mode; otherwise, the address bits are compared with the address configuration of the pins. 3. Whenever the address bits in frame match with that of the address configuration of the pin, the data bits are stored into memory. Also, when this IC finds two continuous and identical data having the same address bits, the data outputs is activated and the VT is enabled. The VT is disabled when there are two continuous mismatched addresses. For the momentary type, the data output is reset; while for the latch type, the data output is sustained.
Power ON
Stand-By Mode Disable VT & Reset output Data ( for Momentary Type) Disable VT & Sustain output data (For Latch Type)
No
Singal IN ? Yes Address bits match? Yes Address bits match? Yes Activate VT
No
No
Yes
Address bits still match? No
Yes
Address bits still match?
No
Decoder With Data Output Pins
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
8
+8V
Receiving Block
100
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47k
47k
15k
SC5272
9
Rosc
14
15
16
18
0.001F
0.001F
TYPICAL APPLICATION CIRCUIT
0.01F 47k 1pF 47k + UTC358 + UTC358 100k 10M 1F/16V 1F/16V 47k 47k 3.3F 47k 2pF 0.001F 27k 7pF
0.001F
10M
13mH
Vcc=+8V
33pF
A
1.5k
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
SC5272
Rev: 1.0
SC5272(No Data) RF Application Circuit
1N4148
270pF
2.2k
9
L1
2000.12.31
Silan Semiconductors
Vcc=+5V
SC5272
18 17
Rosc
1 2 3 4 5 6 7 8 9
16
SC5272-L4
15 14 13 12 11 10
560
From "A" point of the receiving Block
x5
LED x 5
SC5272-L4(4 Data) RF Application Circuit
Vcc=+5V
1 2 3 4 5 6 7 8 9
18 17
10k 1M 2SC1815
16
SC5272-L4
15 14 13 12 11 10
560
x5
IR Receiver
LED x 5
SC5272-L4(4 Data) IR Application Circuit
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
10
Silan Semiconductors
PACKAGE OUTLINE
SC5272
UNIT:mm
2.54
DIP-18-300-2.54
6.40
1.50 22.95
7.62
15 degree
3.51
0.46
DIP-20-300-2.54
2.54
3.30
5.08
0.25
UNIT:mm
6.40
1.50 22.95
7.62
15 degree
3.51
0.46
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
11
3.30
5.08
0.25
Silan Semiconductors
SC5272
UNIT:mm
SOP-20-225-1.27
10.45
7.70
1.27 18.02 17.62
0.41
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
12
1.95
9.53

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