ats278 two phase hall effect latch with fg output this datasheet contains new product information. anachip corp. re serves 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. a4 mar 17, 2004 1/6 ? features - on-chip hall plate - operating voltage: 3.5v~20v - internal bandgap regulator allows temperature compensated operations and a wide operating voltage range - high output sinking capability up to 400ma for driving large load - built-in protection diode only for chip reverse power connecting - frequency generation (fg) output - package: sip-5l ? applications - dual-coil brush-less dc motor - dual-coil brush-less dc fan - revolution counting - speed measurement ? general description ats278 is an integrated hall sensor with two output drivers and rotor speed output, typically designed for electronic commutation of two-phase brush-less dc fan applications. on-chip hall sensor will generate hall voltage due to magnetics sensing. the amplifier will amplify the hall voltage. the schmitt trigger determines switching hysteresis and then control internal driver?s on/off to sink load current. meanwhile, an internal bandgap regulator is used to provide stable bais due to temperature-compensation. fg pin will provide switching frequency of driver. major feature is to minimize the external components by building-in fg output transistor. if a magnetic flux density larger than threshold bop, do is turned on (low) and dob is turned off (high). the output state is held until a magnetic flux density reversal falls below brp causing do to be turned off and dob turned on. ? ordering information ats278 x -x x x -x packing blank : tube or bulk a : tape & reel p: sip-5l package lead l : lead free blank: normal wafer body magnetic characteristics blank or a~z : if necessary to specify a or b ? typical application circuit 278 1 5 4 3 2 5v/12v coil1 coil2 r pu c1 + speed 5v/12v dc brush-less fan with fg output function
ats278 two phase hall effect latch with fg output anachip corp. www.anachip.com.tw rev. a4 mar 17, 2004 2/6 ? block diagram reg. hall plane amp do gnd dob vcc comparators 3 4 5 2 1 1 fg ? pin configuration 1 : fg 2 : vcc 3 : do 4 : dob ( front view ) 15 4 3 2 278 5 : gnd name p/i/o pin # description fg o 1 frequency detection output vcc p 2 positive power input do o 3 driver output dob o 4 driver output ( inverting ) gnd p 5 ground
ats278 two phase hall effect latch with fg output anachip corp. www.anachip.com.tw rev. a4 mar 17, 2004 3/6 ? absolute maximum ratings 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 sink current of fg i fg 40 ma operating temperature range t a -20~+85 c storage temperature range t s -65~+150 c package power dissipation pd 550 mw ? electrical characteristics ( ta=+25 c ) characteristic symbol conditions min typ max unit supply voltage vcc 3.5 ---- 20 v output saturation voltage vce(sat) vcc=14v, il=300ma ---- 300 700 mv output zener breakdown vz 35 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, rl=820 ? , cl=20pf (test circuit) ---- 3.0 10 s output falling time tf vcc=14v, rl=820 ? , cl=20pf (test circuit) ---- 0.3 1.5 s switch time differential ? t vcc=14v, rl=820 ? , cl=20pf (test circuit) ---- 3.0 10 s fg saturation voltage v fg vcc=14v, il=20 ma ---- 200 700 mv 14v do dob pf 20 c c ? 820 r r l2 l1 l2 l1 = = = = 278 1 5 4 3 2 l1 r l2 r l1 c l2 c ( test circuit )
ats278 two phase hall effect latch with fg output anachip corp. www.anachip.com.tw rev. a4 mar 17, 2004 4/6 ? magnetic characteristics( ta=+25 o c) (1mt=10 gauss) a grade characteristic symbol min. typ. max. unit operate point b op 10 - 60 gauss release point b rp -60 - -10 gauss hysteresis b hys - 75 - gauss b grade characteristic symbol min. typ. max. unit operate point b op 5 - 80 gauss release point b rp -80 - -5 gauss hysteresis b hys - 75 - gauss dob do 12 10 8 6 4 2 off op rp on output voltage in volts 12 10 8 6 4 2 off rp op on output voltage in volts -200 200 100 -100 0 -200 200 100 -100 0 magnetic flux density in gauss magnetic flux density in gauss vsat vsat
ats278 two phase hall effect latch with fg output anachip corp. www.anachip.com.tw rev. a4 mar 17, 2004 5/6 ? timing diagram do dob fg rotatory rotor state locked rotatory locked ? marking information 278 part number year: ( front view ) "2" = 2002 "1" = 2001 x x x x x nth week: 01~52 id code blank: normal l: lead free package
ats278 two phase hall effect latch with fg output anachip corp. www.anachip.com.tw rev. a4 mar 17, 2004 6/6 ? package information package type: sip-5l ( unit: mm / [inch] ) 4.2 ref [0.165 ref] 0.001] [0.015 0.03 0.38 0.001] [0.037 0.03 0.95 0.003] [0.144 0.1 3.65 0.003] [0.019 0.1 0.48 ] 003 . 0 206 . 0 [ 1 . 0 22 . 5 2-0.3c [0.079-0.012c] 0.001] [0.015 0.03 0.38 3 ~ 2 0.012] [0.563 0.3 14.3 0.003] [0.061 0.1 1.55 0.003] [0.029 0.1 0.73 5 ~ 2 5 ~ 2 3 ~ 2 ? location of sensing point 1.016 mm [0.04 inch] 2.006 mm [0.079 inch] 12 345 ( top view)
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