complementary output hall effect latch ats276/277 this datasheet contains new product information. anachip corp. reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. rev.1.0 sep 29, 2005 1/7 a t c ? features - on-chip hall sensor with two different sensitivity and hysteresis settings for ats276/277 - 3.5v to 20v operating voltage - 400ma (avg) output sink current - built-in protecting diode only for chip reverse power connecting - -20 c to 85 c operating temperature - low profile 4 pin sip package ? applications - dual-coil brush-less dc motor - dual-coil brush-less dc fan - revolution counting - speed measurement ? general description ats276/277 are integrated hall sensors with output drivers, mainly designed for electronic commutation of brush-less dc fan. this ic internally includes the regulator, protecting diode, hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (do, dob) . while the magnetic flux density (b) is larger than operate point (bop) , do will turn on (low), and meanwhile dob will turn off (hig h). each output is latched until b is lower than release point (brp), and then do dob transfer each state. for dc fan application, sometimes need to test power reverse connection condition. internal diode only protects chip-side but not for coil-side. if necessary, add one external diode to block the reverse current from coil-side. ? ordering information ats27x x - x x - x p: sip-4l package lead l : lead free wafer body magnetic characteristics blank or a~z : if necessary to specify 276:a or b or c part no. 6 : ats276 7 : ats277 277:a or b *packing: bulk ? typical application circuit 12 4 3 27x coil1 coil2 vcc r1 r2 c1 c2 r1 = r2 = 47o c1 = c2 = 2.2 f the r, c value need to be fine tuned base on coils design. brush-less dc fan not recommended for new design, use ah276q not recommended for new design, use ah276
complementary outp ut hall effect latch ats276/277 anachip corp. www.anachip.com.tw rev.1.0 sep 29, 2005 2/7 a t c ? block diagram 1 reg. hall plate amp do gnd 2 3 4 vcc dob ? pin assignment 277 (276) 12 4 3 1 : vcc 2 : do 3 : dob 4 :gnd front view name p/i/o pin # description vcc p 1 power supply input do o 2 output pin dob o 3 output pin gnd p 4 ground not recommended for new design, use ah276q not recommended for new design, use ah276
complementary outp ut hall effect latch ats276/277 anachip corp. www.anachip.com.tw rev.1.0 sep 29, 2005 3/7 a t c ? absolute maximum ratings ( at ta=25 c ) characteristics symbol values unit supply voltage v cc 20 v reverse v cc polarity voltage v rcc -20 v magnetic flux density b unlimited continuous 0.4 hold 0.5 output ?on? current peak (start up) ic 0.7 a operating temperature range t a -20~+85 c storage temperature range t s -65~+150 c package power dissipation pd 550 mw maximum junction temp tj 150 c ? electrical characteristics ( t=+25 c vcc = 4.0v to 20v ) characteristic symbol conditions min typ max units low supply voltage vce vcc=3.5v, i l =100ma 0.4 v supply voltage vcc 3.5 20 v output zener breakdown* vz 46 v output saturation voltage vce(sat) vcc=14v, i l =300ma 0.3 0.6 v output leakage current icex vce=14v, vcc=14v < 0.1 10 a supply current icc vcc=20v, output open 16 25 ma output rise time tr vcc=14v, r l =820 ? , c l =20pf 3.0 10 s output falling time tf vcc=14v, r l =820 ? , c l =20pf 0.3 1.5 s switch time differential ? t vcc=14v, r l =820 ? , c l =20pf 3.0 10 s *note: the vz may vary with the inductance/resistance of dc fan. in order to reduce the risk of dynamic operation, the capacitor/ resistor is recommended to add below the do/dob as application circuit (on page 1). ? test circuit 277 (276) cl1 cl2 14v do dob rl1=rl2=820 ohm cl1=cl2=20 pf rl2 rl1 not recommended for new design, use ah276q not recommended for new design, use ah276
complementary outp ut hall effect latch ats276/277 anachip corp. www.anachip.com.tw rev.1.0 sep 29, 2005 4/7 a t c ? magnetic characteristics ( ta=+25 c) (1mt=10 gauss) a grade characteristic symbol min. typ. max. unit ats276 10 - 50 operate point ats277 bop 10 - 50 gauss ats276 -50 - -10 release point ats277 brp -50 - -10 gauss ats276 - 75 - hysteresis ats277 bhy - 75 - gauss b grade characteristic symbol min. typ. max. unit ats276 5 - 70 operate point ats277 bop 5 - 70 gauss ats276 -70 - -5 release point ats277 brp -70 - -5 gauss ats276 - 75 - hysteresis ats277 bhy - 75 - gauss c grade characteristic symbol min. typ. max. unit operate point ats276 bop - - 100 gauss release point ats276 brp -100 - - gauss hysteresis ats276 bhy - 75 - gauss b hy v sat v cc ( output voltage ) b rp b op 0 ( magnetic flux density b ) do turn on turn off ( off-state ) ( on-state ) b hy v sat v cc ( output voltage ) b rp b op 0 ( magnetic flux density b ) dob turn off turn on ( off-state ) ( on-state ) not recommended for new design, use ah276q not recommended for new design, use ah276
complementary outp ut hall effect latch ats276/277 anachip corp. www.anachip.com.tw rev.1.0 sep 29, 2005 5/7 a t c ? performance characteristics (sip4) ta ( c) 25 50 60 70 80 85 90 95 100 pd (mw) 550 440 396 352 308 286 264 242 220 ta ( c) 105 110 115 120 125 130 135 140 150 pd (mw) 198 176 154 132 110 88 66 44 0 power dissipation curve 0 200 400 600 800 1000 0 25 50 75 100 125 150 ta ( c) pd (mw) 85 typical magnetic switch point vs. supply voltage -40 0 40 80 120 5122024 supply voltage (v) flux density (g) bhys bop brp typical supply current versus supply voltage 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 supply voltage (v) supply current (ma) ta=25 o c ta=80 o c ta=-20 o c not recommended for new design, use ah276q not recommended for new design, use ah276
complementary outp ut hall effect latch ats276/277 anachip corp. www.anachip.com.tw rev.1.0 sep 29, 2005 6/7 a t c ? operating characteristics marking side s b hy v sat v cc ( output voltage ) v d b rp b op 0 s n ( magnetic flux density ) do high low ( sip4 ) n ? marking information 27x part number year: ( top view ) "2" = 2002 "1" = 2001 x xx x x nth week: 01~52 id code: a ~ z wafer lot id: l & a~z is lead-free products ~ not recommended for new design, use ah276q not recommended for new design, use ah276
complementary outp ut hall effect latch ats276/277 anachip corp. www.anachip.com.tw rev.1.0 sep 29, 2005 7/7 a t c ? package information active area depth package sensor location marking side 0.7mm 1.35mm 1234 1.75mm package dimension 14.25mm +/-1.25mm 1.03mm +/-0.1 1.55mm +/-0.1mm 0.38mm +/-0.03mm 5.22mm +/-0.1mm 4.20mm +/-0.1mm 3.65mm +/-0.1mm 1.42mm+/-0.1mm 1.27mm +/-0.03mm 0.41mm +/-0.03mm 0.30mm +/-0.1mm 3.81mm +/-0.03mm 27x 0.46mm +/-0.03mm 0.2mm max. 5 o -7 o o 3 o -5 o 3 o -5 5 o -7 o not recommended for new design, use ah276q not recommended for new design, use ah276
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