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page 1 oct. 26, 2001 general description sm5272b is a remote control decoder paired with sm5262b utilizin g cmos technology. it has 12-bit tri-state address pins providing a maximum of 531,411 (or 3 12 ) address codes; thereby, drastically reducing any code collision and unauthorized code scanning possibilities. sm5272b is available in several options to suit every application needs : variable number of data output pins, latch or momentary output type. features * cmos technology * low power consumption * very high noise immunity * up to 12 tri-state code address pins * up to 6 data pins * wide range of operating voltage: vcc= 2.5 ~ 9 volts * single resistor oscillator * latch or momentary output type * available in dip and sop package applications * garage door * toys * remote control for industrial use block diagram signal re-shap din vt a0 a5 osc1 timing generator osc osc2 address data a6/d5 a11/d0 address compare data compare decode sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 2 oct. 26, 2001 pin assignments ( dip ) 18 vcc 17 vt 16 osc1 15 osc2 14 din 13 a11 12 a10 11 a9 10 a8 vss 9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 sm5272b 18 vcc 17 vt 16 osc1 15 osc2 14 din 13 d0 12 d1 11 a9 10 a8 vss 9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 sm5272b-m2/l2 18 vcc 17 vt 16 osc1 15 osc2 14 din 13 d0 12 d1 11 d2 10 a8 vss 9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 sm5272b-m3/l3 18 vcc 17 vt 16 osc1 15 osc2 14 din 13 d0 12 d1 11 d2 10 d3 vss 9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 sm5272b-m4/l4 18 vcc 17 vt 16 osc1 15 osc2 14 din 13 d0 12 d1 11 d2 10 d3 vss 9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 d4 8 sm5272b-m5/l5 18 vcc 17 vt 16 osc1 15 osc2 14 din 13 d0 12 d1 11 d2 10 d3 vss 9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 d5 7 d4 8 sm5272bm6/l6 sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
20 vcc 19 vt 18 osc1 17 osc2 16 din 15 d0 14 d1 13 d2 12 d3 11 nc sm5272bs-m5/l5 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 d4 8 vss 9 nc 10 page 3 oct. 26, 2001 pin configuration ( sop ) a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 d5 7 d4 8 vss 9 nc 10 sm5272bs 20 vcc 19 vt 18 osc1 17 osc2 16 din 15 a11 14 a10 13 a9 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 12 a8 vss 9 11 nc nc 10 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 vss 9 nc 10 sm5272bs-m2/l2 20 vcc 19 vt 18 osc1 17 osc2 16 din 15 d0 14 d1 13 a9 12 a8 11 nc sm5272bs-m4/l4 20 vcc 19 vt 18 osc1 17 osc2 16 din 15 d0 14 d1 13 d2 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 12 d3 vss 9 11 nc nc 10 sm5272bs-m6/l6 20 vcc 19 vt 18 osc1 17 osc2 16 din 15 d0 14 d1 13 d2 12 d3 11 nc sm5272bs-m3/l3 a0 1 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 vss 9 nc 10 20 vcc 19 vt 18 osc1 17 osc2 16 din 15 d0 14 d1 13 d2 12 a8 11 nc sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
1 2 3 4 5 6 7 a0 a1 a2 a3 a4 a5 a6/d5 i i i i i i / o address input, each pin can be set to "0", "1" , or floating. address input or data output. address input or data output. 8 9 10 a7/d4 vss a8/d3 i / o power i / o 11 12 a9/d2 a10/d1 i / o i / o 13 a11/d0 i / o 14 din i receive from rf module. page 4 oct. 26, 2001 i 15 osc1 resistor connected between these two pins determine the system clock. 16 osc2 17 vt valid transmission indication. 18 v dd positive power supply. i o o power pin function no. pin name i/o function negative power supply. sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 5 oct. 26, 2001 code word a group of code bits is called a code word. a code word consists of 12 address plus data bits followed by one sync bit. the 12 ad bits are interpreted as either address or data bits depending on the sm5272b version used. please refer to the diagrams below: sm5272b sm5272b-m2/l2 a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 sync a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 d1 d0 sync sm5272b-m4/l4 a0 a1 a2 a3 a4 a5 a6 a7 d3 d2 d1 d0 sync sm5272b-m5/l5 a0 a1 a2 a3 a4 a5 a6 d4 d3 d2 d1 d0 sync sm5272b-m6/l6 a0 a1 a2 a3 a4 a5 d5 d4 d3 d2 d1 d0 sync one complete code word sm5272b-m3/l3 a0 a1 a2 a3 a4 a5 a6 a7 a8 d2 d1 d0 sync sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 6 valid transmission after power on sm5272b enters the search address mode, if sm5272b finds 2 consecutive address that matches the address pin setting of sm5272b then it will set vt high. if vt is set high, sm5272b is still in search address. after 2 consecutive address that do not match the setting on sm5272b, sm5272b will disable vt. the timing are shown in the following diagram. latch or momentary data output type after power on sm5272b is set in address search mode, if sm5272b finds 2 consecutive address that matches the address setting of sm5272b. sm5272b will enter data compare mode. it will compare perviously 2 receive data, if they match each then sm5272b will set vt high and send data o/p. sm5272b r e-enters address search mode, after 2 consecutive address that do not match the setting on sm5272b will disable vt and momentary's data but keep latch's data intact. 1st address s 2nd address s vt din oct. 26, 2001 din data words data words tt data output x data output y data pins (momentary) data output x data output y data pins (latch) vt t= 2 code word width sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 7 oct. 26, 2001 operation flowchart after power on sm5272b enters the search address mode, if sm5272b finds 2 consecutive address that matches the address pin setting of sm5272b, it will set vt high. it vt is set high, sm5272b is still in search address. after 2 consecuti ve address that do not match the setting on sm5272b, sm5272b will disable vt. power on address match? set vt address match? address match? address match? disable vt no yes yes no yes yes no no sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 8 oct. 26, 2001 decoder with data output pins after power on sm5272b is set in address search mode, if sm5272b finds 2 consecutive address that matches the address setting of sm5272b. sm5272b will enter data compare mod. it will compare previously 2 received data, if they match then sm5272b will set vt high and send data o/p. sm5272b re-enters address search mode, after 2 consecutive address that do not match setting on sm5272b will disable vt and momentary's data but keep latch's data intact. power on address match? address match? yes yes no no data match? address match? address match? disable vt and remove the momentary data. but keep the latch type data intact. no yes yes no no active vt and o/p data yes sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 9 oct. 26, 2001 single resistor oscillator sm5272b's oscillator be constructed by connecting a resistor between osc1 and osc2 pin. sm5272b's osc frequency must be 1.4 to 6.8 times more than sm5262b. encoder osc frequency sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?! decoder osc frequency suggested oscillator resistor of sm5262b/ sm5272b: sm5262b sm5272b 4.7m ohm 750k ohm 3.0m ohm 390k ohm 2.2m ohm 270k ohm 1.2m ohm 160k ohm r = 510k r = 1.2 m r = 2.7 m r = 3.0 m r = 3.3 m r = 4.3 m 100 khz 0 69 12 15 voltage 90 80 70 60 50 40 30 20 10 2.5 voltage r = 100 k r = 300 k r = 620 k r = 680 k r = 820 k r = 1.0 m 300 0 69 200 100 50 250 2.5 180 khz
page 10 dc electrical characteristics oct. 26, 2001 conditions unit limit symbol min. typ. max. v v cc 2.5 9 vcc = 12 v osc stop a0 ~ a11 open g a i stb 0.02 0.3 i oh i ol parameter supply voltage standby current data output driving current data output sinking current sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?! vcc = 5v v oh = 1v ma 8 vcc = 9v v oh = 1.8v ma 20 vcc = 5v v oh = 4v ma -3.5 vcc = 9v v oh = 7.2v ma -7.1
vss a0 a1 a2 a3 a4 a5 a6 a7 v dd vt osc1 osc2 din a11 a10 a9 a8 rf receiver sm5272b vt rosc application circuit page 11 oct. 26, 2001 sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?!
page 12 ordering information part no. package sm5272b 18 pin dip part no. package sm5272bs 20 pin sop oct. 26, 2001 sm5272b s - x x logo empty: dip type s: so package m:momentary type l: latch type none: 0 data bits 2:two data bits 3:three data bits 4:four data bits 5:five data bits 6:six data bits product no. sm5272b 3 12 rf decoder s am h op microelectronics corp. g?p?t"?! date code serial number esd protection mark xxx xx

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