?W@^?I? 9 ? 7 ? 1 silicon touch technology inc . 9-7f-1, prosperity road i, science based industrial park, hsin-chu, taiwan 300, r.o.c. tel 886-3-5645656 fax 886-3-5645626 FC122 version : a.002 issue date : 2009/07/17 file name : sp-FC122-a.002.doc total pages : 10 fan speed control ic
fan speed control ic version a.002 page 1 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 FC122 fan speed control ic general description the FC122 is a linear fan-speed-control ic designed for power s upply. it is a flexible solution to fan speed control according to the nlx/atx/ps98 fan speed control specification. the FC122 incorporate one linear fan-s peed-control input, and one temperature sensor input for fan-speed-control and monito ring ambient status. additional output is provided to report if temperature fault is sensed. features ? linear fan speed control for high reliable power supply use ? nlx/atx/ps98 fan control compliant ? low power consumption ? adjustable i/o voltage mapping for wide range of application design ? auto-started fan driving fo r over temperature protection ? fault output provided for easy programming control ? low pin count 8-pin dip package block diagram 300ms delay 4 gnd 8 vdd 3 vot 1 fc 2 ts 300ms delay 7 flt v str 6 out 210 k ? 35 k ? v str b a a ? ( b ? ?v dd ) 126 k ? 114 k ? 5 vst vdd v str P ?v dd v out P [ max( ?v dd , v fc , v st ) - ?v dd ] * 6 + v st v oh : v dd v ol : ?v dd
fan speed control ic version a.002 page 2 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 pin description FC122 vxxyyzz pin no. pin name signal type description 1 fc analog input fan speed control input 2 ts analog input sensing voltage from an external thermistor 3 vot analog input reference voltage for over-temperature detection 4 gnd ground ground 5 vst analog input fan start voltage 6 out analog output output voltage 7 flt digital output open-collector output for over-temperature fault 8 vdd power supply voltage absolute maximum ratings (unless otherwise noted, t a = 25 c) parameter rating supply voltage ( v dd ) < +16.0 v input voltage range ( v i ) - 0. 3 v to v dd + 0.3 v output voltage range ( v o ) - 0. 3 v to v dd + 0.3 v junction temperature (t j ) < 150 c operating temperature (t opr ) 0 c to + 70 c storage temperature (t stg ) - 55 c to + 150 c esd susceptibility ( esd ) > 2000 v
fan speed control ic version a.002 page 3 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 electrical characteristics (t a = 25 c, v dd = 12v) parameter symbol conditions min typ max unit power supply supply voltage v dd 11.4 12 12.6 v supply current i dd 2 ma parameter symbol conditions min typ max unit analog input ( fc ) start voltage ( P ?v dd ) v str (fc) 6.03 6.1 6.17 v hysteresis v hyst (fc) 50 100 150 mv parameter symbol conditions min typ max unit analog input ( ts ) start voltage ( P ?v dd ) v str (ts) 6.03 6.1 6.17 v hysteresis v hyst (ts) 250 300 350 mv parameter symbol conditions min typ max unit analog input ( vot ) input voltage ( < v dd ? 2.0v ) v vot 6.0 10.0 v parameter symbol conditions min typ max unit analog input ( vst ) resistance to v dd r dd 126 k ? resistance to v ss r ss 114 k ? input voltage ( < v dd ? 2.0v ) v st 1.0 10.0 v parameter symbol conditions min typ max unit analog output ( out ) start interval t start 240 300 360 ms source current i out 5 ma gain a out v st = 5.7 v 6 parameter symbol conditions min typ max unit open collector digital outputs ( flt ) delay time t flt 240 300 360 ms output low voltage v ol i ol = 1 ma 0.4 v
fan speed control ic version a.002 page 4 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 functional description 1. fan speed control: the output voltage (v out ) can be controlled by fan control input (v fc ). v fc v str(fc) : v out = ( v fc - ?v dd ) * a out + v st 2. temperature protection: pin-ts connects to an external thermistor network for monitoring ambient temperature. the input signal (v ts ) will decide the minimum output voltage (v out ). v ts v str(ts) : v out = ( v ts - ?v dd ) * a out + v st 3. drive output: whenever the fan is started from the off state, it will induce an start-up interval of 0.3 sec, the pin-out wi ll drive full duty in this period and then continue with the voltage determined by max (v fc , v ts ). 4. fault output: pin-flt is an open collector, and active low signal. it will be pulled to low to indicate that over-temperature has occurred. over-temperature: when v ts exceed v vot . v fc v str ( fc ) v out = (v fc ? ?v dd ) * a out + v st v out v dd v ts v str ( ts ) v out = (v ts ? ?v dd ) * a out + v st v out v dd
fan speed control ic version a.002 page 5 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 v fan v fanc 2.0 v 4.0 v 6.0 v 2.0 v 10.0 v 8.0 v 6.0 v 4.0 v 12.0 v 0.0 v 8.0 v 10.0 v 12.0 v v fan v fault t 20 c 40 c 60 c 2.0 v 10.0 v 8.0 v 6.0 v 4.0 v 12.0 v 0 c 80 c 100 c 120 c typical applications 1. fan speed control: 2. temperature protection: +1 2v +1 2v fault 2sd96 5 +1 2v fanc 1 00k rt_ts = 40 50 38k r_o t _l +1 2v 10 k r_f lt +5 v +1 2v 5.7k r_st_l 33k r_fc_ h 1% 1 50k r_ fc 1% 29 k r_ts_h 1% 40k r_f c_ l 1% 64k r_t s_l 1% 64k r_o t_l 1% fl t out vdd vot vst vss fc ts FC122 8 4 1 26 5 3 7 v fa n 6.3k r_st _ h +1 2v
fan speed control ic version a.002 page 6 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 application notes ? about the pins that are unnecessary in certain cases: FC122 provides a highly flexible solution to fan speed control. but in some cases only parts of its functions are needed. w hen this occurs please refer to the following table to see what to do with these unnecessary pins. pin # name description what to do 1 fc fan speed control input grounding 2 ts sensing voltage at thermistor grounding 3 vot reference voltage for over-temperature detecting vdd 7 flt fault open collector output floating
fan speed control ic version a.002 page 7 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 package specification d e 1 e b 1 a1 e a ? 0.0 0.5 1.0 inch 0 10 25 mm 15 5 20 ( 8-pin dip ) l seating plane b e b dimension in mm symbol dimension in inch note a 1 0.381 0.015 a 2 3.175 3.302 3.429 0.125 0.13 0.135 b 1 0.457 0.018 d 9.017 9.271 10.160 0.355 0.365 0.4 e 1 6.223 6.376 6.528 0.245 0.251 0.257 e 2.540 0.100 l 2.921 3.302 3.810 0.115 0.13 0.150 ? 0 7 15 0 7 15 a 5.334 0.210 e 7.366 7.620 7.874 0.290 0.300 0.310 e b 8.509 9.017 9.525 0.335 0.355 0.375 b 1.524 0.06 min normal max min normal max a2
fan speed control ic version a.002 page 8 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 package specification (continued) d e h a 1 a c l 0.0 0.2 0.4 inch 0 10 mm 5 ( 8-pin sop ) seating plane b e 0.015 x 45 dimension in mm symbol dimension in inch note a 1 0.102 0.254 0.004 0.010 c 0.203 0.008 d 4.801 4.978 0.189 0.196 e 1.270 0.050 l 0.406 1.270 0.016 0.050 a 1.346 1.753 0.053 0.069 e 3.810 3.988 0.150 0.157 h 5.791 6.198 0.228 0.244 b 0.406 0.016 ? 0 8 0 8 min normal max min normal max a 2 1.346 1.499 0.053 0.059 a 2 0.004 max
fan speed control ic version a.002 page 9 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. fc12 2 the products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. hence, it is advisable that t he devices should not be used in medical instruments, surgical implants, aerospa ce machinery, nuclear power control systems, disaster/crime-prevention equi pment and the like. misusing those products may directly or indirectly endanger human life, or cause injury and property loss. silicon touch technology, inc. will not ta ke any responsibilities regarding the misusage of the products menti oned above. anyone who purchases any products described herein with the above -mentioned intention or with such misused applications should accept full responsibility and indemnify. silicon touch technology, inc. and its distribut ors and all their officers and employees shall defend jointly and severally against an y and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. silicon touch technology, inc. reserv e the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information bei ng relied on is current and complete.
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