SS5781 unipolar hall switc h-low sensitivity features and benefits a pplication examples ? automotive, consumer and industrial ? solid-state switch ? brushless dc motor commutation ? speed detection ? angular position detection ? proximity detection ? current detector ? 3.5v to 24v operation ? -40 to 150 superior temperature operation ? cmos technology ? low current consumption ? chopper-stabilized amplifier stage ? open drain output ? low sensitivity ? small size-sot23 3l or sip 3l ? both rohs compliant packages 3 pin sot23 (suffix so) 3 pin sip (suffix ua) functional block diagram vdd 1 v2.00 may 1, 2012 voltage regulatr out ? ? choppe r hall plate gnd sip package sot package pin 1 ? v dd pin 1 ? v dd pin 2 ? gnd pin 2 ? out pin 3 ? out pin 3 ? gnd
SS5781 unipolar hall switc h-low sensitivity 2 v2.00 may 1, 2012 general description the SS5781 is a unipolar hall-effe ct sensor ic fabricated from cmos technology. the device integrates a voltage regulator, hall sensor with dynamic offset cancellation system, small signal amplifier, schmitt trigger and an open-drain output driver. with suitable output pull up, they can be used with bipolar or cmos logic circuits. these hall-effect switches are monolithic integrated circuits with tighter magnetic specific ations, designed to operate continuously over extended temperatures to +150 ,and are more stable with both temp erature and supply voltage changes. the unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. thanks to its wide operating voltage range and extended choice of temperature range, it is quite suitable for use in automotive, industrial and consumer applications. the device is delivered in a small outline transistor (sot) or in a plastic single in line (sip 3l flat). both 3-lead packages are rohs compliant. glossary of terms millitesla (mt), gauss units of magnetic flux density: 1mt = 10 gauss rohs restriction of hazardous substances 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 branded side of the package which turns the output driver off (v out = high)
SS5781 unipolar hall switc h-low sensitivity pins definition and description 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 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 -65 to 170 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 12 5 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. 3 v2.00 may 1, 2012
SS5781 unipolar hall switc h-low sensitivity general electrical specifications dc operating parameters t a = 25 , v dd = 3.5v 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 3.5 24 v s upp l y c u rr e n t i dd b < b rp 1.5 2.5 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 0.4 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 0.01 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 magnetic specifications dc operating parameters v dd = 3.5v to 24v (unless otherwise specified) SS5781 parameter symbol test conditions min typ max units o p e r a t i ng p o i n t b op 70 110 150 g r e l ea s e p o i n t b rp 20 60 100 g hy s t e r e s i s b h y s ta=25 ,vdd=12v dc 20 50 70 g application information typical three-wire application circuit 4 v2.00 may 1, 2012
SS5781 unipolar hall switc h-low sensitivity automotive and harsh, noisy environments three-wire circuit application comments for proper operation, a 100nf bypass capacitor should be placed as close as possible to the device between the vdd and ground p in. for reverse voltage protection, it is recommended to connect a resistor or a diode in series with the vdd pin. when using a resistor, three points are important: - the resistor has to limit the reverse current to 50ma maximum (vcc / r1 50ma) - the resulting device supply voltage vdd has to be higher than vdd min (vdd = vcc ? r1.idd) - the resistor has to withstand the power di ssipated in reverse volta ge condition (pd = vcc 2 / r1) 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 applicatio n and a diode for higher supply voltage are recommended. both solutions provide the requi red reverse voltage protection. when a weak power supply is used or when the device is intended to be used in nois y 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 vdd. the diode d1 provides additional reverse voltage protection. esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control procedures whenever handling semiconductor products. 5 v2.00 may 1, 2012
SS5781 unipolar hall switc h-low sensitivity package information package ua, 3-pin sip: 6 v2.00 may 1, 2012
SS5781 unipolar hall switc h-low sensitivity ? package se, 3-pin sot-23: ordering information part no. pb-free temperature code package code packing SS5781esot yes -40c to 85c sot-23 7-in. reel, 3000 pieces/reel SS5781eua yes -40c to 85c to-92 bulk, 1000 pieces/bag SS5781ksot yes -40c to 125c sot-23 7-in. reel, 3000 pieces/reel SS5781kua yes -40c to 125c to-92 bulk, 1000 pieces/bag SS5781lsot yes -40c to 150c sot-23 7-in. reel, 3000 pieces/reel SS5781lua yes -40c to 150c to-92 bulk, 1000 pieces/bag 7 v2.00 may 1, 2012
|
