ss1881 hall latch - high sensitivity 1 v2.00 may.1, 2012 a pplication examples f eatures and benefits ? automotive, consumer and industrial ? w ide operating voltage range from 2.5v to 24v ? s olid-state switch ? high m agnetic sensitivity ? multi-purpose ? b rushless dc motor commutation ? cmos t echnology ? s peed detection ? chop per-stabilized amplifier stage superior temperature stability extremely low switchpoint dr insensitive to physical stress ? lin ear position detection ? angular position detection ? proximity detection ? ? lo w current consumption ? open drain output ? tiny sot23 3l or flat sip 3l both rohs compliant packages 3 pin sot23 (suffix so) 3 pin sip (suffix ua) functional block diagram hall plate vdd out voltage regulatr choppe r gnd p in 2 ? gnd pin 2 ? out pin 3 ? out pin 3 ? gnd p in 1 ? v dd pin 1 ? v dd sip package sot package
ss1881 hall latch - high sensitivity 2 v2.00 may.1, 2012 general discription the ss1881 is a bipolar hall effect sensor ic fabricated from mixed signal cmos technology. the device integrates a voltage regulator, hall sensor with dynamic offset cancellation system, schmitt trigger and an open-drain output driver, all in a single package. it incorporates advanced chopp er stabilization techniques to provide accurate and stable magnetic switch points. there are many applications for this hed ? hall electronic device - in addition to those listed above. the design, specifications and performance have been optimized for commutation applications in 5v and 12v brushless dc motors. thanks to its wide operating vo ltage range and extended choice of temperature range, it is quite suitable for use in automotive, industrial and consum er applications. the device is delivered in a small outline transistor (sot) for surface mount process or in a plas tic single in line (sip 3l flat) for through- hole mount. both 3-lead packages are rohs compliant. glossary of terms millitesla (mt), gauss units of ma gnetic flux density: 1mt = 10 gauss rohs restriction of hazardous substances sot small outline transistor (sot package) ? also referred with the package code ?so? esd electro-static discharge bldc brush-less direct-current operating point (b op ) magnetic flux density applied on the bran ded side of the package which turns the output driver on (v out = v dson ) release point (b rp ) magnetic flux density applied on the bran ded side of the package which turns the output driver off (v out = high) pin definitions and descriptions sot pin sip pin name type function 1 1 v dd s upp l y s upp l y v o l t a g e p i n 2 3 o ut o u t pu t open dr a i n output p i n 3 2 gnd g r ound ground p i n
ss1881 hall latch - high sensitivity 3 v2.00 may.1, 2012 detailed general description the ss1881 exhibits latch magnetic switching characteristics. therefore, it requires both south and north poles to operate prop erly. the out pin of these devices switches low (turns on) when a magne tic field perpendicular to the hall sensor exceeds the operate point threshold, b op . after turn-on, the output voltage is v dson . note that the device latches, that is, a south pole of sufficient strength towards the branded surface of the device turns the device on. the device remains on if the south pole is removed (b 0). this latching property defines the device as a magnetic memory. when the magnetic field is reduced below the release point, b rp , the out pin turns off (goes high). the difference in the magnetic operate and release points is the hysteresis, b hys , of the device. this built-in hysteresis prevents output oscillation near the switching point, and allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. the device behaves as a latch with symmetric operating and release switching points (b op =|b rp |). this means magnetic fields with equivalent strength and opposite direction drive the output high and low. powering-on the device in the hysteresis region (less than b op and higher than b rp ) allows an indeterminate output state. the correct state is attained after the fi rst excursion beyond b op or b rp . the sot-23 device is reversed from the ua package. the sot-23 output transistor will be latched on in the presence of a suffici ently strong north pole magnetic field applied to the marked face. out p ut level unique features based on mixed signal cmos technology, ss1881 is a hall-effect de vice with high magnetic sensitivity. this multi-purpose latch meets most of the application requirements. the chopper-stabilized amplifier uses switched capacitor techniqu e to suppress the offset generally observed with hall sensors and amplifiers. the cmos technology makes this advanced technique po ssible and contributes to smaller chip size and lower current consumption than bipolar technology. the small chip size is also an important factor to minimize the effect of physical stress. this combination results in more stable magnetic characteristics and enables faster and more precise design. the wide operating voltage from 2.5v to 24v, low current consum ption and large choice of operating temperature range according to ?l?, ?k?and ?e? specification make this device suitable for automotive, industrial and consumer applications. 0mt 0mt out p ut level o ut = high f lux densit y o ut = high b op 30gs typ out = low out = low ua package - latch characteristic b op 30gs typ b rp -30gs typ b rp -30gs typ flux densit y se package - latch characteristic ? hys b b hys
ss1881 hall latch - high sensitivity 4 v2.00 may.1, 2012 absolute maximum ratings parameter symbol value units s upp l y v o l t a g e v dd 28 v s upp l y c u rr e n t i dd 50 m a output v o l t a g e v o ut 28 v output c u rr e n t i o ut 50 m a storage temperature range t s -50 to 150 c m a x i m u m j un c t i on temperature t j 165 c absolute maximum ratings operating temperature range symbol value units temperature s u ff i x ? e ? t a -40 to 85 c temperature s u ff i x ? k ? t a -40 to 125 c temperature s u ff i x ? l ? t a -40 to 150 c exceeding the absolute maximum ratings may cause permanent damage. exposure to absolute-maximum- rated conditions for extended periods may affect device reliability. general electrical specifications dc operating parameters t a = 25 , v dd = 2.5v to 24v (unless otherwise specified) parameter symbol test conditions min typ max units s upp l y v o l t a g e v dd o p e r a t i ng 2.2 24 v s upp l y c u rr e n t i dd b < b rp 5 m a output s a t u r a t i on v o l t a g e v d s on i out = 20ma, b > b op 0.5 v output l ea k a g e c u rr e n t i o ff b < b rp v out = 24 v 1 10 a output r i s e t i m e t r r l = 1k? , c l = 20pf 0.25 s output f a ll t i m e t f r l = 1k? , c l = 20pf 0.25 s m a x i m u m s w i t c h i ng f r e qu e n c y f s w --- 10 k h z package t h e r m a l r e s i s t a n c e r th s i ng l e l a y e r (1s) jedec bo a r d 301 c /w electrical specifications note: the output of ss1881 will be switched after the supply voltage is over 2.2v, but the magnetic characteristics won't be normal until the supply is over 2.5v.
ss1881 hall latch - high sensitivity 5 v2.00 may.1, 2012 magnetic specifications dc operating parameters v dd = 2.5v to 24v (unless otherwise specified) parameter symbol test conditions min typ max units o p e r a t i ng p o i n t b op 15 30 45 g r e l ea s e p o i n t b rp - 45 -30 -15 g hy s t e r e s i s b h y s e spec., t a = 85c 45 60 75 g o p e r a t i ng p o i n t b op 15 30 50 g r e l ea s e p o i n t b rp - 50 -30 -15 g hy s t e r e s i s b h y s k spec., t a = 125c 45 60 75 g o p e r a t i ng p o i n t b op 10 30 55 g r e l ea s e p o i n t b rp - 55 -30 -10 g hy s t e r e s i s b h y s l spec., t a = 150c 40 60 80 g magnetic specifications output behaviour versus magnetic pole dc operating parameters t a = -40 c to 150 c, v dd = 2.5v to 24v (unless otherwise specified) parameter test conditions (se) out (se) test conditions (ua) out (ua) south po l e b < b rp h i gh b > b op l o w north po l e b > b op l o w b < b rp h i gh output behaviour versus magnetic pole ? ?
ss1881 hall latch - high sensitivity 6 v2.00 may.1, 2012 application information it is strongly recommended that an external bypass capacitor be connected (in close proximity to the hall sensor) between the supply(vdd pin) and ground(gnd pin) of the device to reduce both external noise and noise genera ted by the chopper stabilizatio n technique. as is shown in the two figures in next page, a 0.1 f capacitor is typical. for reverse voltage protection, it is recommended to connect a resistor or a diode in series with the v dd pin. when using a resistor, three points are important: - the resistor has to limit the reverse current to 50ma maximum (v cc / r1 50ma) - the resulting device supply voltage v dd has to be higher than v dd min (v dd = v cc ? r1*i dd ) - the resistor has to withstand the power dissipated in reverse voltage condition (p d = v cc 2 /r1) when using a diode, a reverse current cannot flow and the voltage drop is almost constant ( 0.7v). therefore, a 100 ? /0.25w resistor for 5v application and a diode for higher supply voltage are recommended. both solutions provide the required reverse voltage protection. when a weak power supply is used or when the device is intended to be used in noisy environment, it is recommended that figure 13.3 from the application information section is used. the low-pass filter formed by r1 and c1 and the zener diode z1 bypass the disturbances or voltage spikes occurring on the devic e supply voltage v dd . the diode d1 provides additional reverse voltage protection. s1881 r2 c2 vdd gnd out c1 s1881 r1:100 vdd gnd out c1 z1 d1 a utomotive and s evere environment protection circuit typical three-wire application c ircuit c2 r2 the ss1881 have been optimized for commutation applications in 5v and 12v brushless dc motors. the follow figure is the typical application circuit for 3 phase brushless dc motors.
ss1881 hall latch - high sensitivity 7 v2.00 may.1, 2012 standard information regarding manufacturability of hall ic with different soldering processes our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level accordin g to following test methods: reflow soldering smd?s (surface mount devices) ? ipc/jedec j-std-020 moisture/reflow sensitivity classification for nonhermetic solid state surface mount devices (classification reflow profiles according to table 5-2) ? eia/jedec jesd22-a113 preconditioning of nonhermetic surface mount devices prior to reliability testing (reflow profiles according to table 2) wave soldering smd?s (surface mount devices) and thd?s (through hole devices) ? en60749-20 resistance of plastic- encapsulated smd?s to co mbined effect of moisture and soldering heat ? eia/jedec jesd22-b106 and en60749-15 resistance to soldering temperature for through-hole mounted devices iron soldering thd?s (through hole devices) ? en60749-15 resistance to soldering temperature for through-hole mounted devices solderability smd?s (surface mount devices) and thd?s (through hole devices) ? eia/jedec jesd22-b102 and en60749-21 solderability esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control procedures whenever handling semiconductor products.
ss1881 hall latch - high sensitivity 8 v2.00 may.1, 2012 package information package ua, 3-pin sip:
ss1881 hall latch - high sensitivity 9 v2.00 may.1, 2012 package se, 3-pin sot-23 ? 1.50 1.40 chip 3 2 1 bottom view of sot-23 packa g e 0.95 0.80 0.56 0.66 ordering information ? part no. pb-free temperature code package code packing SS1881ESOT yes -40c to 85c sot-23 7-in. reel, 3000 pieces/reel ss1881eua yes -40c to 85c to-92 bulk, 1000 pieces/bag ss1881ksot yes -40c to 125c sot-23 7-in. reel, 3000 pieces/reel ss1881kua yes -40c to 125c to-92 bulk, 1000 pieces/bag ss1881lsot yes -40c to 150c sot-23 7-in. reel, 3000 pieces/reel ss1881lua yes -40c to 150c to-92 bulk, 1000 pieces/bag ?
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