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silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 1 remote fan control ic description the sc2128c is a high performance electronic fan controller lsi, speed control, off-timer, rhythm wind, sleep mode, head swing and/or light control are all built into a single chip. indicator led output, buzzer output, key control input, as well as remote control decoding circuitry are all provided to build a full function electronic fan with remote control capability having the highest performance with the least external components. pin assignment and application circuit are optimized for easy pcb layout and cost saving for electronic fan application. features * high performance cmos technology * low power consumption * optional independent light control * 90 seconds cycle/6 seconds per step(off step 3 seconds) rhythm wind pattern * built-in remote control decoding circuitry with mask option custom code * available in 16,18,20,22,24 pin package for none, one set or two sets of swing head and/or light control * two sets of swing head and/or light control * three operation modes: ordinary, rhythm and rhythm sleep. dip-24-300-2.54 applications * optimized for fan application * suitable for heater fan, cooling fan, and other home appliances with remote contro l, timer and/or output level control pin configuration sc2128c 20 19 18 17 5 6 7 8 16 15 14 13 12 11 10 9 nc remote osci osco v dd off/buzz speed mode lord com led3 led2 led1 lit so1 timer 1 2 3 4 24 23 22 21 so2 st mi lo nc v ss light sw1
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 2 ordering information sc2128c- x x x x s = swing head output(s) controlled by a single key (mask option) d = two swing head outputs controlled by double keys (d can be omitted) 0 = no swing head output 1 = 1 swing head output 2 = 2 swing head outputs 3 = 1 swing head & light control outputs 4 = 2 swing head & light control outputs 2 = 1/2/4 hour, non-accumulated timer 3 = 1/2/4 hour, accumulated timer 4 = 0.5/1/2/4 hour, non-accumulated timer 5 = 0.5/1/2/4 hour, accumulated timer 8 = 1/2/4/8 hour, non-accumulated timer 9 = 1/2/4/8 hour, accumulated timer d = non-memory start-up & non-middle wind start-up (mask option) c = non-memory start-up & middle wind start-up l = memory start-up & non-middle wind start-up (mask option) m = memory start-up & middle wind start-up note: sc2128c standard ics: sc2128c-c41, sc2128c-c51, other options are available upon request and require a minimum order quantity. please contact silan or your local agent for details. block diagram osc timing speed control filter decoder key sense memory timer led scan swing/ light osco osci remote speed timer mode sw1 sw2 off/mems/ buzz light lit so1 so2 led2 led3 led1 com st mi lo v dd v ss
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 3 absolute maximum ratings characteristic symbol test conditions value unit supply voltage v dd -- 0 ~ 6.0 v input/output voltage v i , v o v dd - v ss -0.3v ~ v dd +0.3v v power dissipation p d v dd C v ss = 5.0 500 mw operating temperature topr -- -20 ~ +70 c storage temperature tstg -- -40 ~ +125 c electrical characteristics parameter symbol test conditions min typ max unit supply voltage v dd -- 4.0 5.0 6.0 v stand-by current iq v dd =5.0v, oscillator stops. all output floating, all input fixed to v dd . -- 134 200 a input high level voltage v ih -- v dd -1.5 -- -- v input low level voltage v il -- -- -- 1.5 v drive current (com) i oh v dd =5.0v, vo=3.5v 15 21.5 -- ma sink current (com) i ol v dd =5.0v, vo=1.5v -12 -16.5 -- ma drive current(led1, led2, led3) i oh v dd =5.0v, vo=3.5v 5 6.5 -- ma sink current(led1, led2, led3) i ol v dd =5.0v, vo=1.5v -4 -5.7 -- ma drive current (off/buzz) i oh v dd =5.0v, vo=2.5v 1.5 3.0 -- ma sink current (off/buzz) i ol v dd =5.0v, vo=2.5v -2 -3.7 -- ma sink current (lo,mi,st,so1, so2,lit) i ol v dd =5.0v, vo=2.5v -6.5 -16 -- ma oscillation frequency f osc -- -- 32768 -- hz key press duration t key -- 80 -- -- ms remote input bit duration t bit -- 2.0 2.5 3.0 ms
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 4 pin description pin no. symbol i/o function 1 nc -- no connection 2 remote i remote control sensor input 3 v ss -- negative power supply 4 osci i oscillator input pin 5 osco o oscillator output pin 6 v dd -- positive power supply 7 off/buzz i/o off control key input, shared with buzzer output 8 speed i speed key control input 9 mode i mode key control input 10 sw1 i swing head 1 control key input 11 light i light control key input 12 nc -- no connection 13 lord o ordinary wind indicator led output 14 lit o light output 15 so1 o swing head 1 output 16 timer i timer key control input 17 com o indicator led common output 18 led3 o indicator led output pin 19 led2 o indicator led output pin 20 led1 o indicator led output pin 21 st o (strong) speed output pin 22 mi o (middle) speed output pin 23 lo o (low) speed output pin 24 so2 o swing head 2 output functional description 1. control keys up to six(6) function keys C speed, mode, timer, sw1, light and off/mems C may be used on the control panel of fan to access sc2128c to its full versatility. off/buzz key input pin se rves further as buzzer output buzz pin. all key inputs are internally pulled-high in sc2128c. speed key controls the fan speed. timer key adjusts off-timer. mode key sets fan into various modes of operation. sw1 key control the head swing of fan. light key toggles the lit output on and off. off/buzz key resets the fan to idle state when fan is on. lit output is not affected by off key.
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 5 2. speed key speed key is used to (1) turn on the fan (2) change speed of the fan. sleep key my turn on the fan from remote control handset. all the other key scan not turn on the fan. all the other keys, except light key, can not operate until fan is turned on. the diagram shows the state transition of sc2128c for successive pressing of speed key. off lo=z mi=z st=z mi start lo=z mi=l st=z low lo=l mi=z st=z mid lo=z mi=l st=z str lo=z mi=z st=l speed key 2-3 sec, delay s p e e d k e y speed key sp eed key z=high impedence l=low voltage middle wind start-up optioned 3. timer key timer key is used to set time schedule after which sc2128c will automatically restore off state(off-timer). when the fan is on, pressing timer key sets up the off-timer. each pressing of timer key increases the timer by one step. each time increment step is determined by various timer options. either 0.5 or 1 hour per step may be selected, and either 3 levels or 4 levels timer may be selected. please see timer section for details. 4. mode key mode key is used to bring sc2128c around ord (ordinary wind) mode, rtm (rhythm wind ) mode and rsl(rhythm sleep wind ) mode. in ord mode, the wind speed is set by speed key and does not change as time passes. in rtm mode the wind speed cycles through three rhythm wind, patterns as set by the speed key. in rsl mode, however, the fan automatically steps down one level (strong to middle, middle to low) every 30 minutes and keeps in low wind until off-timer times out. four modes of operation are described in details later. off ord rtm rsl speed key m o de key m o de key mode key
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 6 5. sw1 key sw1 controls the output status of so1 and so2 outputs which in turn control the head swing of fan. each pressing of sw1 key toggles so1 and so2 outputs as shown in the diagram right. so1=z so2=z so1=l so2=z so1=z so2=l so1=l so2=l s w 1 k e y s w 1 k e y s w 1 k e y s w 1 k e y fan already on z=high impedence l=low voltage 6. light key light key toggles lit output on(l) and off(z). lit output can only be controlled with light key (from both panel and remote control) and sleep key (if available) on remote control handset. off key does not affect lit output. lit output is not affected by off key as well as off-timer times out. 7. off/buzz key off/buzz key functions differently depending on whether the fan is on or off. it functions as off key when the fan is on, and is used to bring sc2128c from any on state into off state. lit output is not affected by off key. 8. indicator leds up to twelve(13) indicator leds may be constructed on the control panel of fan built with sc2128c. six(6) led sare constructed as 3x2 led matrix formed by com and led1, led2, led3. the other six(6) leds are built in series with triac outputs and the thirteenth led is used as ordinary wind mode indicator. the diagrams show how the led matrix is constructed. v dd com led3 led2 led1 v ss -5v tb2 tb3 tb0 tb1 sleep rhythm sc2128c lo mi st so1 so2 lit sc2128c low middle strong swing 1 swing 2 light lord ord
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 7 * four leds (tb0, tb1, tb2, tb3) are used to indicate the off-timer period. depending on the base timer step option, timer step may be 0.5 hour or 1 hour as indicated in the diagram. if sc2128c is selected with 4 hour timer option if sc2128c is selected with 8 hour timer option tb0=0.5 hour b1=1 hour b2=2 hour b3=4 hour tb0=1 hour b1=2 hour b2=4 hour b3=8 hour the time schedule is the sum of all on leds. for example, if sc2128c is programmed with 1/2/4/8 hour accumulated timer option, and is tb0 is on, tb1 is off, tb2 is off, tb3 is on, then the schedule period is 9 hours (1 hr + 9 hr). * rhythm led , sleep led and ordinary led indicate sc2128c operation modes. operation mode rhythm led sleep led ordinary led ord (ordinary wind) off off on rtm (rhythm wind) on off off rsl (rhythm sleep wind) off on off * three leds C low, middle and strong C are used to indicate the respective output status of lo, mi, st output. led being on indicates output active (l). led being off indicates output inactive (z). only one output among lo, mi and hi may be active at a specific time. * swing1 led, swing2 led and light led indicated respective output status of so1, so2, and lit. 9. timer the external timer of sc2128c may be bonding optioned into six (6) configurations as shown. each pressing of timer key will step the internal timer one step up. the actual sequence depends on the timer option selected. the following diagrams show the timer sequence for each timer option. timer automatically counts down as time passes by. the count down sequence reverses the key sequence and is also shown in the following diagrams. : 0.5, 1, 2, 4 hours non-accumulated : 1, 2, 4, 8 hours non-accumulated : 0.5, 1, 2, 4 hours accumulated : 1, 2, 4, 8 hours accumulated : 1, 2, 4 hours non-accumulated : 1, 2, 4 hours accumulated
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 8 none 1 2 4 t i m e r t i m e r timer timer 1hr 2 h r 1hr (5) none 1 2 t i m e r timer timer 1hr 1hr 2+ 1 4 timer timer 1hr 1hr 4+ 1 4+ 2 timer t i m e r 1hr 1 h r 1hr 4+ 2+ 1 timer 1hr (6) none 0.5 1 t i m e r timer timer 0.5hr 0.5hr 1+ 0.5 timer 4+ 2+ 1 timer 0.5hr 0.5hr 4+ 2+ 1+ 0.5 timer 0.5hr 2 2+ 0.5 timer 4+ 2 timer 0.5hr 0.5hr 4+ 2+ 0.5 timer 0.5hr timer 0.5hr 2+ 1 2+ 1+ 0.5 timer 0.5hr 4+ 1 timer 0.5hr 0.5hr 4+ 1+ 0.5 timer 0.5hr timer 0.5hr 4 timer 4+ 0.5 t i m e r 0 . 5 h r (3) none 0.5 1 2 4 timer t i m e r t i m e r timer timer 1hr 2 h r 4hr 1hr (2) none 0.5 1 2 4 timer t i m e r t i m e r timer timer 0.5hr 0 . 5 h r 2hr 0.5hr (1) none 1 2 t i m e r timer timer 1hr 1hr 2+ 1 timer 8+ 4+ 2 timer 1hr 1hr 8+ 4+ 2+ 1 timer 1hr 4 4+ 1 timer 8+ 4 timer 1hr 1hr 8+ 4+ 1 timer 1hr timer 1hr 4+ 2 4+ 2+ 1 timer 1hr 8+ 2 timer 1hr 1hr 8+ 2+ 1 timer 1hr timer 1hr 8 timer 8+ 1 t i m e r 1 h r (4) 10. rhythm wind sc2128c features rhythm wind mode. it can be set into rhythm wind mode by pressing mode key. furthermore, there are three levels C strong, middle and low rhythm wind. pressing speed key cycles sc2128c around the three levels, from low to middle, middle to strong, then strong to low. initial rhythm wind level on entering rhythm wind mode is the same as the ordinary wind level while leaving ordinary wind mode and entering rhythm wind mode. the right diagram depicts the strong, middle and low rhythm wind patterns. t=0 strong rhythm wind pattern t=0 middle rhythm wind pattern t=0 low rhythm wind pattern seconds t=90 seconds t=90 seconds t=90 lo mi st lo mi st lo mi st
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 9 11. rhythm sleep wind mode pressing mode key in sleep wind mode brings sc2128c into rhythm sleep wind. in rhythm sleep wind mode, sc2128c outputs low, middle or strong rhythm wind pattern and automatically steps down one level every 30 minutes until it reaches low rhythm wind level. if no off-timer is set, sc2128c keeps in low rhythm wind output. otherwise it restores off state when the off-timer times out. t=0 t=0.5hr t=1.0hr timer timeout hours middle rhythm sleep mode wind pattern strong rhythm wind t=0 t=0.5hr t=1.0hr timer timeout hours strong rhythm sleep mode wind pattern t=0 t=0.5hr t=1.0hr timer timeout hours low rhythm sleep mode wind pattern middle rhythm wind low rhythm wind strong rhythm wind middle rhythm wind low rhythm wind strong rhythm wind middle rhythm wind low rhythm wind 12. buzzer output all valid key pressed except off/buzz initiates a 150ms duration 4khz 50% duty cycle pulse train at off/buzz pin. off/buzz key function as off key if pressed when fan is in any on state. in this case, it does not initiate an output on buzz. note that when off/buzz outputs the pulse train, key input is suppressed. that is, pressing off/buzz key when the buzzer is buzzing is not recognized by sc2128c. the diagram right shows the buzzer connection. sc2128c v ss v dd off/buzz off/buzz key -5v 13. remote control decoder sc2128c is designed to be used together with sc2268 infrared ray remote control encoder. such combination allows up to 8 remote control keys C speed, mode, timer, light, sleep, sw1, sw2, off/buzz C to be built on the remote control handset. 4 bits customer code, b3 ~ b6, is encoded by sc2268 and decoded by sc2128c in order to avoid remote control contention between devices. with sc2268, b3 is determined by bonding option; b4, b5 and b6 are determined by connecting respective c4, c5, c6 pin to v dd or v ss . with sc2128a, b3 and b6 can be mask programmed upon customer request and with nre. the remote control signal coding scheme is fully compatible with sc2268. some description follows. please refer to specification of sc2268 for details. when sc2128c receives a remote control signal at its remote pin, it decodes the received waveform into consecutive 0 bits and 1 bits. it first compares the received start word against its customer code. if and only if the start word matches the customer code, it then compares for two consecutive and matched code words. it then actuates the command according to the code words table shown later. start word 1st code word 2nd code word code frame b0 b1 b2 b3 b4 b5 b6 b7 start/code word: code bit: "1" bit: 0.625ms 1.875ms 2.5ms "0" bit:
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 10 14. customer code the default customer code of sc2128c is internally mask programmed to b0 ~ b7 = 00110011. code bit b3 ~ b6 may be mask programmed to any value according to customer specification under terms and conditions agreed by silan. suitable nre is involved with customizing default customer code. please refer to the following table. mask option start word default customer code b0 b1 b2 b3 b4 b5 b6 b7 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1 0 0 1 1 0 1 1 1 0 0 1 1 0 1 0 1 0 0 1 1 1 0 1 1 0 0 1 1 1 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 1 1 0 1 0 0 1 0 0 0 1 1 0 0 1 0 0 0 0 1 0 0 1 0 0 1 1 1 0 0 1 0 0 1 0 1 0 0 1 0 1 0 1 1 0 0 1 0 1 0 0 1 0 0 1 0 1 1 1 1 mask programmable customer code 0 0 1 0 1 1 0 1 15. remote control keys up to eight keys may be built on the remote control handset. except sleep key, all keys functions the same as their panel counterparts. sleep key is not available on fan panel, and is only available on remote control handset. pressing sleep key brings sc2128c to the output states as follows: speed middle wind mode rtm wind timer 4 hours or 8 hours swing so1 on, so2 off light lit on the remote transmission code words are defined in the following table. code word equivalent key b0 b1 b2 b3 b4 b5 b6 b7 sc2268 corresponding keys speed 0 0 1 1 1 0 1 0 i1 mode 0 1 0 1 1 0 0 0 i2 timer 0 1 1 0 0 0 1 0 i3 light 1 0 0 1 1 1 0 0 i4 sleep 1 0 1 0 0 1 1 0 i5 sw2 1 0 1 1 0 0 0 1 i6 sw1 1 1 0 0 0 1 0 1 i7 off/mems 1 1 0 1 0 0 1 0 i8
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 11 16. various options sc2128c accommodates many option possibilities. the options are summarized below: * package option: either 16, 18, 20, 22, or 24 pin pack age. * bonding option: acc: accumulated or non-accumulated timer option. t0.5: timer scale, 0.5/1/2/4 hour timer or 1/2/4/8 timer option. 3lt: timer l evel option, either 4 levels or 3 levels. nm: disable memory m ode. * metal option: b3 ~ b6: replaces default customer codes nms: disable middle wind start-up function 2sw: dependent/independent swing head control option.
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 12 application circuit 20 19 18 17 5 6 7 8 16 15 14 11 10 9 nc remote osci osco vdd off/buzz speed mode com led3 led2 led1 lit so1 timer 1 2 3 4 24 23 22 21 so2 st mi lo vss light sw1 sc2128c 47pf 32.768khz 47pf ir module -5v 9.1k off speed sw1 mode light light 220 strong 220 timer -5v tb3 tb2 tb0 tb1 sleep rhythm 220 middle 220 220 220 low swing2 ac two swing head controlled by sw1 swing1 ac ac var 22 /2w fuse 6.8v/1w 200k 2.5 f/250v in4004 470 f 16v 1k 10 f 16v 2sa1015 0.1 f -5v 13 12 nc lord 1k supply circuit
silan semiconductors sc2128c hangzhou silan microelectronics joint-stock co.,ltd rev: 1.1 2001.09.26 13 sc2268 ir transmitter application circuit 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 sc2268 i1 i2 i3 i4 i5 i6 i7 i8 vcc osc1 osc2 tx out c4 c5 c6 vss +3v speed mode timer light sleep sw2 sw1 off/mems a1015 c1815 10" 455khz ir led 220pf 220pf 1k" note: sc2268 is recommended to be used with sc2128c. for this circuit, the start word is 00110011 package outline dip-24-300-2.54 2.54 7.62 0.25 15 degree 0.46 34.50 1.50 5.08 3.30 unit: mm 6.40 3.51

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