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SC5272 remote control decode r paired with sc5262 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(v cc =3v ~6v) * 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 hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 1 o f 13
SC5272 block diagram 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 (t amb =25 c ) characteristics symbol ratings unit supply voltage v cc -0.3 ~ 6 v input voltage v in -0.3 ~ v cc +0.3 v output voltage v out -0.3 ~ v cc +0.3 v maximum power dissipation p a 300 mw operating temperature t opr -20 ~ +70 c storage temperature t stg -40 ~ +125 c electrical characteristics (t amb =25 c,v cc =5v,unless otherwise specified) characteristics symbol test condition min. typ. max. unit supply voltage v cc 3 6 v dout output driving current i oh v cc =5v,v oh =3v -3 ma dout output sinking current i ol v cc =5v,v ol =3v 2 ma input high voltage v ih 0.7v cc v cc v input low voltage v il 0 0.3v cc v hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 2 o f 13
SC5272 pin configuration hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 3 o f 13
SC5272 hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 4 o f 13 pin description pin no. 18 pin 20 pin pin name description 1~6 1~6 a0~a5 code address pins no. 0~5. these si x 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 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 data input pin. the encode waveform received is serially fed to SC5272 at this pin. 15 17 osc1 oscillator pin 1 16 18 osc2 oscillator pin 2 a resistor connected between these two pins determine the fundamental frequency of SC5272. 17 19 vt valid transmission. active high signal. vt in high state signifies that SC5272 receives valid transmission waveform. 18 20 v cc positive power supply 9 9 v ss negative power supply -- 10~11 nc no connection function 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 fo r 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 float ing state respectively. one bit waveform consists of two pulse cycles. each pulse cycl e has 16 oscillating time periods. for further details, please refer to the diagram below:
SC5272 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. 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 sc526 2. 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: hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 5 o f 13
SC5272 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: 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 t he 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 t he 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 in itially checks whether this is a valid transmission. for a transmission to be valid, (1) it must be a comple te code word, and (2) the address bits must match the address setting at the address pins. after two consecut ive 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 hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 6 o f 13
SC5272 4. latch or momentary data output type the SC5272 uses either the latch or momentary data output type dependi ng on the SC5272 version used. the latch type SC5272-lxactivates the data out during transmi ssion 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: 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 rece ived, it remains in the stand-by mode; otherwise, the address bits received are compared with the address configurat ion of the pins. 3. the vt goes high signifying the validation of trans mission 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. decoder without da ta output pin hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 7 o f 13
SC5272 decoder with data output pins 1. when the power is turned on , t he 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 cont inuous and identical data having the same address bits, the data outputs is activated and t he vt is enabled. the vt is disabled when there are two continuous mismatched addresses. for the moment ary type, the data output is reset; while for the latch type, the data output is sustained. decoder with data output pins hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 8 o f 13
SC5272 typical application circuit hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 9 o f 13 SC5272 l1 33pf 0.01 f 47k 47k 1pf 2pf 270pf 10m 47k 47k 100k + - + - 27k rosc utc358 utc358 13mh 5v vcc=5v 18 16 receiving block a 15 14 9 SC5272(no data) rf application circuit
SC5272 typical application circuit (continued) SC5272-l4(4 data) rf application circuit hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 10 of 13 SC5272-l4 1m 10k 2sc1815 SC5272-l4(4 data) ir application circuit
SC5272 package outline dip-18-300-2.54 unit: mm dip-20-300-2.54 unit: mm hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 11 of 13 6.600.25 0.250.10 7.62typ 4.36max 3.00min
SC5272 package outline (continued) sop-20-375-1.27 unit: mm 10.2 0.4 7.6 0.3 9.525 12.7 0.25 11.43 1.27 0.4 0.250.05 3.1max handling mos devices: electrostatic charges can exist in many things. all of our mos devices are inte rnally protected against electrostatic discharge but they can be damage d if the following precautions are not taken: ? persons at a work bench should be earthed via a wrist strap. ? equipment cases should be earthed. ? ? all tools used during assembly, including sol dering tools and solder baths, must be earthed. ? mos devices should be packed for dispatch in antistatic/conductive containers. hangzhou silan microelectronics co.,ltd rev:1.2 2008.02.22 http://www.silan.com.cn page 12 of 13

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