View IC-MZ_3241832.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

IC-MZ differential hall switch rev a3, page 1/ 11 features ? dual hall sensors set 2.0 mm apart ? magnetic ?eld frequency range from dc to 40 khz ? supply voltage range 4.5 to 36 v ? complementary push-pull line driver outputs with integrated line adaptation ? output stages are current limited and short-circuit-proof due to temperature shutdown ? min. 200 ma output current at 24 v supply voltage ? low driver stage saturation voltage (< 0.4 v at 30 ma) ? rs422-compatible (tia / eia standard) ? temperature and supply voltage monitor with error messaging ? ampli?ed differential sensor signal, accessible for diagnostic purposes ? additional mode of operation (twofold line driver) ? temperature range from -40c to 125c (option: -55c) applications ? gear wheel sensing ? pole wheel and magnetic tape scanning ? magnetic incremental encoders ? proximity switches ? two-channel line drivers up to 100 khz packages dfn10 4 mm x 4 mm block diagram copyright ? 2011 ic-haus http://www.ichaus.com d nd a na nerr test gnd2 gnd1 vpa vb 4.5 ... 36 v line
IC-MZ differential hall switch rev a3, page 2/ 11 description hall-effect device IC-MZ is a differential magnetic sensor used to scan pole wheels or ferromagnetic gear wheels. it contains two hall sensors set 2.0 mm apart, a differential ampli?er with a back-end com- parator and a complementary line driver. a difference in ?eld strength of the magnetic normal components at IC-MZs two hall elements is ampli?ed and eval- uated as an analog signal and fed to the integrated line drivers as a complementary digital signal. the digital output signal tracks the change in sign of the ?eld strength difference with a given hysteresis and thus provides a clear switch. with a moving gear or pole wheel the frequency of the tooth or pole pair corresponds to the frequency of the output signal. the ampli?ed analog differential sensor signal is available for diagnostic purposes at pins a and na. once the device has been switched on the digital out- puts are initially in a prede?ned start state with d at low and nd at high; the analog outputs a and na switched to high impedance. following a delay of about 200 s the analog outputs are activated and the status of the two hall sensors ist transmitted by the line drivers if the difference in ?eld strength is suf- ?ciently strong. the complementary line drivers are suitable for sup- ply voltages of 4.5 to 36 v with output impedances between 40 and 110
. an integrated over temper- ature and undervoltage monitor switches the output stages to high impedance in the event of error and activates the open drain output nerr. by activating the test input the device can be used as an independent two-channel line driver. in this case, the outputs d and nd are controlled by the in- puts a and na. the analog section of the IC-MZ circuit is fed by an internal supply of 5 v which is available at pin vpa for reference purpose. to improve signal quality, a capacitor can be connected to this pin. packages pin configuration pin functions no. name function 1 gnd1 ground 2 d digital output, not inverted 3 vb supply voltage 4 nd digital output, inverted 5 gnd2 ground 6 test linedriver test mode 7 nerr error output, open drain 8 vpa internal 5 v supply voltage 9 na analog output, invertiert 10 a analog output, non invertierend for improved thermal dissipation the thermal pad on the package underside should be connected to ground in a suitable manner ( ground plane ). gnd1 and gnd2 should both be connected to ground. orientation of the logo ( mz code ...) is subject to alteration. IC-MZ ......yyww 6 9 7 8 1 0 5 2 4 3 1
IC-MZ differential hall switch rev a3, page 3/ 11 absolute maximum ratings beyond these values damage may occur; device operation is not guaranteed. absolute maximum ratings are no operating conditions. integrated circuits with system interfaces, e.g. via cable accessible pins (i/o pins, line drivers) are per principle endangered by injected interferences, which may compromise the function or durability. the robustness of the devices has to be veri?ed by the user during system development with regards to applying standards and ensured where necessary by additional protective circuitry. by the manufacturer suggested protective circuitry is for information only and given without responsibility and has to be veri?ed within the actual system with respect to actual interferences. item symbol parameter conditions unit no. min. max. g001 vb supply voltage -0.4 40 v g002 v() voltage at d, nd, nerr -0.4 40 v g003 v() voltage at a, na, test -0.4 6 v g004 i(vb) current in vb -100 100 ma g005 i() current in d, nd -600 600 ma g006 i(nerr) current in nerr -10 30 ma g007 i() current in a, na, test -4 4 ma g008 vd() susceptibility to esd at all pins hbm 100 pf discharged through 1.5 k
1 kv g009 tj operating junction temperature -55 150 c g010 ts storage temperature range -55 150 c thermal data operating conditions: vb = 4.5..36 v, unless otherwise stated item symbol parameter conditions unit no. min. typ. max. t01 ta operating ambient temperature range -40 +125 c extended temperature range (option -et) -55 +125 c t02 rtjc thermal resistance chip/case 10 k/w t03 rthja thermal resistance chip/ambient mounted on pcb, with thermal pad of 2 cm 2 40 k/w all voltages are referenced to ground unless otherwise stated. all currents ?owing into the device pins are positive; all currents ?owing out of the device pins are negative.
IC-MZ differential hall switch rev a3, page 4/ 11 electrical characteristics operating conditions: vb = 4.5..36 v, tj = -55...135 c unless otherwise stated item symbol parameter conditions unit no. min. typ. max. general 001 fmagn magnetic cut-off frequency (upper 3 db frequency corner) 40 khz 002 vb permissible supply voltage 4.5 36 v 003 i(vb) supply current in vb open outputs, fmagn = 0 9 12 ma 004 |h dc | magnitude of mean magnetic ?eld strength |h dc | = |h 1 + h 2 | / 2, outputs a, na not saturated 400 ka/m 005 | h| maximal magnetic ?eld difference | h| = |h 1 h 2 | 120 ka/m 006 h t,hi upper magnetic trigger threshold output d lo ! hi for h > h t,hi 2 ka/m 007 h t,lo lower magnetic trigger threshold output d hi ! lo for h < h t,lo -2 ka/m 008 h t,hys hysteresis h t,hys = h t,hi h t,lo 4 ka/m 009 vc()lo clamp voltage lo at pins vb, vpa, vpd, a, na, d, nd, nerr, test i() = -10 ma -1.4 -0.35 v 010 vc()hi clamp voltage hi at pins vb, nerr i(vb) = 10 ma, test = hi, i(nerr) = 1 ma 37 50 v 011 vc()hi clamp voltage hi at pins vpa, vpd, a, na, test i(vpa, vpd) = 10 ma, i(a, na, test) = 2 ma 6 20 v 012 tsetup system enable from power on to activating outputs 200 400 s 013 i(vb) supply current in vb, test mode open outputs, test = hi (line driver mode) 6 ma temperatur monitor 301 toff thermal shutdown threshold 145 175 c 302 ton thermal lock-on threshold 135 165 c 303 thys thermal shotdown hysteresis thys = ton - toff 5 10 20 c differential outputs a, na, line driver test mode 501 rout() output resistance 14 20 28 k
503 vdc() mean output voltage h = 0 1.5 1.8 2.1 v 504 | v()| output voltage difference | h| = 1ka/m, | v()| = |v(a) v(na)| 70 mv 505 vt()hi input threshold voltage hi test = hi (leitungstreibermodus) 2 v 506 vt()lo input threshold voltage lo test = hi (leitungstreibermodus) 0.8 v 507 vt()hys input hysteresis test = hi (leitungstreibermodus) 0.2 0.4 0.6 v 508 ipd() pull-down current v() = 0.8 v, test = hi 10 100 a 509 ipd() pull-down current v() = 5.5 v, test = hi 20 200 a error output nerr 601 vs()lo saturation voltage lo at nerr i(nerr) = 2.5 ma, nerr = lo 0.4 v 602 isc()lo short-circuit current lo in nerr v(nerr) = 2 v...vb, nerr = lo 4 12 25 ma 603 ilk() leakage current in nerr v(nerr) = 5.5 v...vb, nerr = hi -10 10 a 604 vb supply voltage vb for nerr function i(nerr) = 2.5 ma, nerr = lo, vs(nerr) < 0.4 v 3.2 v 605 rpu() pull-up-resistor at nerr v(nerr) = 0...4.5 v 1 2.5 5.5 m
test mode nerr, test 704 rpd(test) pull-down resistor at test test mode = off, v(test) vpa 11 20 36 k
710 vt(test)hi threshold voltage hi at test 2 v 711 vt(test)lo threshold voltage lo at test 0.8 v 712 vt(test)hy hysteresis 0.2 0.4 0.6 v 713 vt(nerr)hi threshold voltage hi at nerr test = hi 2.5 v
IC-MZ differential hall switch rev a3, page 5/ 11 electrical characteristics operating conditions: vb = 4.5..36 v, tj = -55...135 c unless otherwise stated item symbol parameter conditions unit no. min. typ. max. line driver d, nd 801 vs()hi saturation voltage high vs()hi = vb - v(), i() = -10 ma, output = hi 0.2 v 802 vs()hi saturation voltage high vs()hi = vb - v(), i() = -30 ma, output = hi 0.4 v 803 isc()hi short circuit current high v() = vb - 1.5 v, output = hi -70 -50 -35 ma 804 isc()hi short circuit current high v(ax) = 0 v, output = hi -600 ma 805 rout()hi output resistance vb = 10...36 v, v() =0.5 * vb 40 75 110
806 sr()hi slew rate high vb= 36 v, cl() = 100 pf 100 250 v/s 807 vc()hi free wheel clamp voltage high i() = 100 ma, vb = vcc = gnd 0.5 1.3 v 808 vs()lo saturation voltage low i() = 10 ma, output = lo 0.2 v 809 vs()lo saturation voltage low i() = 30 ma, output = lo 0.4 v 810 isc()lo short circuit current low v() = 1.5 v, output = lo 35 50 70 ma 811 isc()lo short circuit current low v() = vb, output = low 600 ma 812 rout()lo output resistance vb = 10...36 v, v() = 0.5 * vb 40 75 110
813 sr()lo slew rate low vb = 36 v, cl() = 100 pf 100 250 v/s 814 vc()lo free wheel clamp voltage low i() = -100 ma -1.3 -0.5 v 815 ilk() leakage current in d, nd vb < vboff; v() = 0...vboff -10 10 a 816 ilk() leakage current in d, nd t > toff; v() = 0...vb -10 10 a vb voltage monitor 901 vbon turn-on threshold vb 4.45 v 902 vboff turn-off threshold vb 3.2 v 903 vbhys hysteresis vpahys = vpaon vpaoff 100 200 mv 907 v(vpa) voltage at vpa vb > 5 v 4.5 5 5.5 v 908 v(vpa) voltage at vpa vb 5 v 4 5 v
IC-MZ differential hall switch rev a3, page 6/ 11 definition of magnetic fields and sensor output signals in essence IC-MZ is non-magnetic and thus has prac- tically no effect on the magnetic ?eld to be scanned. the hall sensors on the topside of the chip or at pack- age level (x, y) are sensing the z component h z of the magnetic ?eld vector at the site of each sensor. magnetic ?eld component h z counts as a positive when the ?eld lines emerge on the printed upper side of the chip. the source of the magnetic ?eld (magnets, coils) can be placed above or below (back bias) the ic package. figure 1: example magnet positions in relation to IC-MZ the difference h between z components h 1 and h 2 of the magnetic ?eld strengths at the site of the two hall sensors s1 and s2 is signi?cant for the electrical output signal. h = h 1 h 2 figure 2: de?nition of the difference in ?eld strength h in accordance with figure 2 a distinction can be made between the different position and polarity of a mag- net from the sign of the sensor signal. following the ampli?cation of the hall voltage difference a differen- tial analog signal v(a) or v(na) is available at pins a and na with a mean voltage of vdc (figure 3 ). if h exceeds a limit of h t,hi , digital output d switches to high. if h undershoots a threshold of h t,lo , output d is switched back to low. the switching status com- plementary to d is available at output nd. if differential ?eld strength h lies within the h t,lo ..h t,hi interval, the momentary switching status of the driver outputs does not change. figure 3: analog signals a and na as a function of the difference in ?eld strength h figure 4: digital output d in dependence on the dif- ference in ?eld strength h m z x y z n s n s + b m z + b m z m z n s s1 h 1 h 2 h > 0 s2 pin 1 m z m z s n s1 h 1 h 2 s2 pin 1 x y z h < 0 h v v(a) vdc v(na) 0 h t,hi h = h ? h t,hys t,hi t,lo h t,lo v(d) vb 0 h
IC-MZ differential hall switch rev a3, page 7/ 11 hall sensor position the position of the two hall sensors s1 and s2 is shown in figure 5 (top view). figure 5: position of hall sensors s1 and s2 in rela- tion to the chip center (dimensions in mm) the position tolerances of the chip within the dfn10 package are given in figure 6. figure 6: maximum placement error of the chip (ex- aggerated view) in a dfn10 package (di- mensions in mm) line driver mode IC-MZs line driver mode is activated by test = high, i.e. by a supply of vpa = 5 v. pins a and na then func- tion as independent inputs for line driver outputs d and nd. when pins a and na are connected together and used as common input, d and nd acts as buffered and inverted outputs. figure 7: IC-MZ in line driver mode center of chip 2,0 0,14 s1 s2 x y s2 s1 center of chip | | < 3 0.4 typ. top view side view x y x z | | < 0.2 | | < 0 . 2 d nd a na nerr test gnd2 gnd1 1 vpa vb 4.5 ... 36 v line temperatur monitor error control IC-MZ > 145 c 5v supply hall sensor b amplifier a/d line driver analog buffer test 5v rpu b
IC-MZ differential hall switch rev a3, page 8/ 11 applicaton notes the complementary line driver couples the output sig- nals via lines to industrial 24 v systems. due to the possible event of short circuiting in the line the drivers are current limited and shut down with excessive tem- perature. the maximum possible signal frequency de- pends on the capacitive loading of the outputs (line length) or the power dissipation in IC-MZ caused by such. with an unloaded output the maximum output voltage is equivalent to supply vb - with the exception of the saturation voltages. figure 8: load dependence of the output voltage figure 8 illustrates the typical highside output charac- teristics of a driver acting as a load for two different supply voltages. across a wide range the differential output resistance is typically 75
. line effects with 24 v signals data is often transmitted without the line beeing terminated with the characteristic impedance. mismatched line terminations such as these cause re?ections which travel back and forth if no suitable adjustments have been made at the driver end of the setup. with rapid pulse trains transmission is then disrupted. in IC-MZ the re?ection of return signals is hindered by an integrated impedance adapter. on pulse transmis- sion the amplitude at the IC-MZ output ?rst rises to ap- proximately half the value of supply voltage vb as the internal driver resistor and the line impedance adapter form a voltage divider. following a delay determined by the length of the line the impedance coupled into the line in this way is re?ected at the high impedance end of the setup and travels back towards the driver. as the latter is well adjusted to the line by its interior resistor, the return pulse is largely absorbed. fast signals can thus also be transmitted in this manner along lines with a characteristic impedance of between 40 and 110
. board layout the thermal dissipation of IC-MZ is improved by con- necting the thermal pad on the underside to a large area of copper on the board. blocking capacitors used to ?lter the local ic supply should be connected up to the vb and gnd package pins across the shortest possible distance. nerr connection excessive temperature and overvoltage errors are in- dicated at output nerr. in normal operating mode the pin is at high impedance (open drain); it is switched to gnd in the event of error. it can be connected up to vb via an external resistor. if nerr is not used, it must be left open and not be connected to gnd. 0 0 4 8 12 16 20 24 28 32 36 40 100 200 300 400 500 vb = 36 v vb = 24 v - i(d, nd) [ma] v ( d , n d ) [ v ]
IC-MZ differential hall switch rev a3, page 9/ 11 application examples gear wheel scanning logging the position and rotation of a gear wheel with IC-MZ requires that the gear wheel is made of a soft magnetic basic material with which a magnetic ?eld applied externally through the gear geometry can be modulated. the strength of the modulation is greatest at the gear rim, calling for IC-MZ to be placed at the shortest possible operating distance to the gear wheel. the necessary external bias ?eld is generated by a back bias magnet placed behind IC-MZ. the magnet should be positioned central to the package so that the two hall sensors are impinged by equal magnetic ?eld strengths and a ?eld strength offset is avoided; the lat- ter would make a greater difference in modulation ?eld strength necessary for switching purposes. field ho- mogeneity can be improved by placing a pole piece between the magnet and IC-MZ. the strength of the magnetic ?eld modulation depends not just on the operating distance and the intensity of the bias ?eld but also on the module and addendum of the gear wheel. the distance of the teeth along the perimeter of the wheel stipulates the cycle with which the magnetic ?eld strength is modulated. an optimum modulation depth is achieved when the gear wheel ge- ometry is selected so that the two hall sensors on the chip are opposite a tooth or a gap and the sensors pro- vide signals in antiphase. with the given IC-MZ sensor distance of 2 mm a tooth distance of about 4 mm is ad- vantageous but not imperative. even if the geometry of the wheel is not adapted to suit the sensor, the signals generated by the two hall sensors share a ?xed phase relation. figure 9 illustrates the typical course of magnetic in- duction b = 0 h at the two hall sensors, dependent on angle of rotation of the gear wheel. in an ensuing ampli?cation process analog signals v a and v na are formed from the differential signal; digital signals v d and v nd are generated by the back-end comparator with hysteresis. figure 9: gear wheel scanning p s1 s2 b 1 b 1 b 2 b t,hi b- b 12 b b 2 IC-MZ bias magnet bias field n s gear wheel v p p/2 v na v a v dc 3p/2 p p/2 3p/2 v d b t,l o v b p p/2 3p/2 v nd v b 0 p/2 0 p 3p/2
IC-MZ differential hall switch rev a3, page 10/ 11 figure 10: pole wheel scanning pole wheel scanning pole wheels have a cyclic magnetization along their perimeter which is used for the magnetic modulation of IC-MZ. the intensity of the magnetic ?eld is great- est along the perimeter and signi?cantly diminishes with an increase in distance , so that IC-MZ should be placed as close to the pole wheel as possible. the magnetic subdivision along the pole wheel perimeter is repeated by a cycle p; IC-MZs electrical output signals also demonstrate this periodicity. the pole wheel is optimally adjusted when the hall sen- sors are activated in antiphase, i.e. the distance of the hall sensors is equivalent to just half a magnetic cycle. with IC-MZ this is the case when p = 4 mm. the dimensions of a pole wheel and its magnetic sub- division are often stipulated by the application so that the signals provided by the two hall sensors are no longer in antiphase but in an arbitrary yet ?xed phase relation to one another. the differential signal and the analog and digital IC-MZ output signals derived from it in dependence on the an- gle of rotation of a pole wheel are shown in figure 10. ic-haus expressly reserves the right to change its products and/or speci?cations. an info letter gives details as to any amendments and additions made to the relevant current speci?cations on our internet website www.ichaus.de/infoletter ; this letter is generated automatically and shall be sent to registered users by email. copying C even as an excerpt C is only permitted with ic-haus approval in writing and precise reference to source. ic-haus does not warrant the accuracy, completeness or timeliness of the speci?cation and does not assume liability for any errors or omissions in these materials. the data speci?ed is intended solely for the purpose of product description. no representations or warranties, either express or implied, of merchantability, ?tness for a particular purpose or of any other nature are made hereunder with respect to information/speci?cation or the products to which information refers and no guarantee with respect to compliance to the intended use is given. in particular, this also applies to the stated possible applications or areas of applications of the product. ic-haus conveys no patent, copyright, mask work right or other trade mark right to this product. ic-haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. as a general rule our developments, ips, principle circuitry and range of integrated circuits are suitable and speci?cally designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. in principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the bureau of statistics in wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in hanover (hannover-messe). we understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to. p s1 s2 b 1 b 1 b 2 b t,hi b- b 12 b b 2 IC-MZ pole wheel v p p/2 v na v a v dc 3p/2 p p/2 3p/2 v d b t,l o v b p p/2 3p/2 v nd v b 0 p/2 0 p 3p/2 n s p/2 p 3p/2 n s
IC-MZ differential hall switch rev a3, page 11/ 11 ordering information type package options order designation IC-MZ dfn10 IC-MZ dfn10 dfn10 extended temperature range -55c..125c IC-MZ dfn10 et -55/125 for technical support, information about prices and terms of delivery please contact: ic-haus gmbh tel.: +49 (61 35) 92 92-0 am kuemmerling 18 fax: +49 (61 35) 92 92-192 d-55294 bodenheim web: http://www.ichaus.com germany e-mail: sales@ichaus.com appointed local distributors: http://www.ichaus.com/sales_partners

▲Up To Search▲

Price & Availability of IC-MZ

	To Download IC-MZ Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .