SC5272

SC5272 ETC | Alldatasheet

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Technical content

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 1 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 3 12) address codes; thereby, drastically reducing any code collision and unauthorized code scanning possibilities.

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 APPLICATION * Home/automation security system * Remote control toys or for industrial use * Remote control fan * Garage door controller DIP-20 DIP-18 SOP-20

ORDERING INFORMATION

L: Latch Type M: Momentary Type S: SOP-20 Package D: DIP-20 Package Omitted: DIP-18 Package 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

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 2 PIN CONFIGURATION 1A0 Vss NC Vcc VT OSC1 OSC2 Din NC 1A0 Vss NC Vcc VT OSC1 OSC2 Din NC 1A0 Vss NC Vcc VT OSC1 OSC2 Din NC SC5272-M2/L2SC5272-M4/L4SC5272-M6/L6 1A0 Vss NC Vcc VT OSC1 OSC2 Din A11 A10 NC 1A0 Vss NC Vcc VT OSC1 OSC2 Din NC 1A0 Vss NC Vcc VT OSC1 OSC2 Din NC SC5272SC5272-M3/L3SC5272-M5/L5

18 Pin

20 Pin

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 3 BLOCK DIAGRAM 87654321 11 12 13 System Timing Control Logic Compare Logic Tri-stateAddress Data Detect OSC 171615 A0 A1 A2 A3 A4 A5 Vss Vcc VTOSC1OSC2 Data Detect Sync. Detect Output Logic DinA6 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=25°C) Characteristic Symbol Value Unit Supply Voltage Vcc -0.3 ~ 16.0 V Input Voltage Vi -0.3 ~ Vcc+0.3 V Output Voltage Vo -0.3 ~ Vcc+0.3 V Maximum Power Dissipation(Vcc=12V) Pa 300 mW Operating Temperature Topr -20 ~ +70 °C Storage Temperature Tstg -40 ~ +125 °C /G3

ELECTRICAL CHARACTERISTICS

(Ta=25°C,Vcc=12V,unless otherwise specified) Characteristic Symbol Test Condition Min Typ. Max Unit Supply Voltage Vcc 3 15 V Supply Current Icc Vcc=12V,OSC stops A0~ A11 Open 0.02 0.3 mA Vcc=5V,VOH =3V -3 mA Dout Output driving Current I OH Vcc=8V,VOH =4V -6 mA Vcc=12V,VOH =6V -10 mA Vcc=5V,VOL =3V 2 mA Dout Output sinking Current I OL Vcc=8V,VOL =4V 5 mA Vcc=12V,VOL =6V 9 mA Input High Voltage V IH 0.7Vcc Vcc V Input Low Voltage V IL 00 . 3 V c c V

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 4 PIN DESCRIPTION Pin No.

18 PIN 20 PIN Pin Name I/O Description

1~6 1~6 A0~A5 I 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). 7~8 10~13 7~8 12~15 A6/D5~A11/D0 I/O 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. 14 16 DIN I Data Input Pin. The encode waveform received is serially fed to SC5272 at this pin. 15 17 OSC1 I Oscillator pin 1 16 18 OSC2 O Oscillator pin 2 A resistor connected between these two pins determine the fundamental frequency of SC5272. 17 19 VT O Valid Transmission. Active high signal. VT in high state signifies that SC5272 receives valid transmission waveform. 18 20 Vcc -- Positive Power Supply 9 9 Vss -- Negative Power Supply -- 10~11 NC -- No Connection 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: a 4a 12a 12a 4a 32a OSC bit "0" bit "1" bit "f" Where: a = oscillating clock period . Bit “ f ” is only available for address bits.

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 5 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 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: 0 3 6 9 12 15 100 Supply Voltage (V) Frequency (kHz) Encoder OSC Frequency 0 3 6 9 12 15 1000 Supply Voltage (V) Frequency (kHz) Decoder OSC Frequency 100 R=510k Ω R=1M Ω R=3.3M Ω R=4.7M Ω R=100k Ω R=240k Ω R=510k Ω R=1M Ω R=2M Ω R=2M Ω Suggested Oscillator resistor values are shown below: 4.7MΩ 820kΩ 3.3MΩ 1.2MΩ 680kΩ 200kΩ SC5262 SC5272

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 6 2. IR OPERATION 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: OSC "0" "1" "f" Sync 160λ 20λ 60λ Note:λ=2 clock lengths 620λ 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 440kW resistor connected between OSC1 and OSC2 pins of SC5262-IR is recommended. Moreover, for a matching decoder frequency, 1MW 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. 1st word 2nd word Sync bit Sync bit Ta Tb Tc Din Data pins (momentary) VT Ta= 8 OSC clock width Tb= 1 OSC clock width Tc=2 code word width

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 7 4.LATCH OR MOMENTARY DATA OUTPUT TYPE 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: Data Words Data Words Data Output X Data Output Y Data Output X Data Output Y Din Data Pins (Momentary) Data Pins (Latch) VT T T 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 Singal IN ? Address bits match? Address bits match? Activate VT Address bits still match? Address bits still match? Disable VT Yes Yes No No No Yes Yes No Yes No Decoder Without Data Output Pin

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 8 Decoder With Data Output Pins 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 Singal IN ? Address bits match? Address bits match? Activate VT Address bits still match? Address bits still match? Disable VT & Reset output Data ( for Momentary Type) Yes Yes No No No Yes Yes No Disable VT & Sustain output data (For Latch Type) No Yes Decoder With Data Output Pins

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 9 TYPICAL APPLICATION CIRCUIT SC5272 33pF 1.5kΩ 0.01µF 47kΩ 47kΩ 0.001µF 0.001µF 1pF 7pF 2pF 270pF 2.2kΩ 47kΩ 0.001µF 1µF/16V 47kΩ 1N4148 3.3µF 10M Ω 47kΩ 47kΩ 15kΩ 100Ω 100kΩ 1µF/16V 27kΩ 47kΩ Rosc UTC358 UTC358 0.001µF 13mH +8V Vcc=+8V 10MΩ Receiving Block A 1615149 18 SC5272(No Data) RF Application Circuit

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 10 SC5272-L4 From "A" point of the receiving Block 560Ω x5 LED x 5 Rosc Vcc=+5V SC5272-L4(4 Data) RF Application Circuit /G3 /G3 SC5272-L4 560Ω x5 LED x 5 1M Ω Vcc=+5V IR Receiver 10kΩ 2SC1815 SC5272-L4(4 Data) IR Application Circuit /G3

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 11 PACKAGE OUTLINE DIP-18-300-2.54 UNIT:mm 6.40 2.54 3.51 5.083.30 7.62 0.25 15 degree 0.46 22.95 1.50 DIP-20-300-2.54 UNIT:mm 6.40 2.54 3.51 7.62 0.25 15 degree 0.46 22.95 1.50 5.083.30 /G3 /G3

/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31/G3 /G3 12 /G3 /G3 SOP-20-225-1.27 UNIT:mm 10.45 7.70 9.53 1.95 18.02 17.62 1.27 0.41 /G3 /G3