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note: for detailed information on purchasing options, contact your local allegro field applications engineer or sales representative. allegro microsystems, inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. the information included herein is believed to be accurate and reliable. however, allegro microsystems, inc. assumes no respon - sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 ? for the a1321eua-t and the a1321lua-t use the a1324lua-t ? for the a1321elhlt-t and the a1321llhlt-t use the a1324llhlx-t ? for the a1322lua-t use the a1325lua-t ? for the a1322llhlt-t use the a1325llhlx-t ? for the a1323eua-t and the a1323lua-t use the a1326lua-t ? for the a1323llhlt-t use the a1326llhlx-t date of status change: october 31, 2011 this device is no longer in production. the device should not be purchased for new design applications. samples are no longer available. discontinued product
description the a132x family of linear hall-effect sensor ics are optimized, sensitive, and temperature-stable. these ratiometric hall-effect sensor ics provide a voltage output that is proportional to the applied magnetic field. the a132x family has a quiescent output voltage that is 50% of the supply voltage and output sensitivity options of 2.5 mv/g, 3.125 mv/g, and 5m v/g. the features of this family of devices are ideal for use in the harsh environments found in automotive and industrial linear and rotary position sensing systems. each device has a bicmos monolithic circuit which integrates a hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the hall element, a small-signal high-gain amplifier, and a rail-to-rail low- impedance output stage. a proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. the high frequency clock allows for a greater sampling rate, which results in higher accuracy and faster signal processing capability. this technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise a1321-ds, rev. 23 features and benefits ? temperature-stable quiescent output voltage ? precise recoverability after temperature cycling ? output voltage proportional to magnetic flux density ? ratiometric rail-to-rail output ? improved sensitivity ? 4.5 to 5.5 v operation ? immunity to mechanical stress ? solid-state reliability ? robust emc protection ratiometric linear hall effect sensor ics for high-temperature operation functional block diagram not to scale a1321, a1322, and a1323 continued on the next page? packages: 3 pin sot23w (suffix lh), and 3 pin sip (suffix ua) amp gnd vout vcc out offset trim control gain 0.1 f v+ dynamic offset cancellation filter
recoverability after temperature cycling. having the hall element and an amplifier on a single chip minimizes many problems normally associated with low-level analog signals. output precision is obtained by internal gain and offset trim adjustments made at end-of-line during the manufacturing process. the a132x family is provided in a 3-pin single in-line package (ua) and a 3-pin surface mount package (lh). each package is available in a lead (pb) free version (suffix, ?t) , with a 100% matte tin plated leadframe. description (continued) ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 2 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com selection guide part number packing 1 mounting ambient, t a (oc) sensitivity, typ. (mv/g) a1321elhlt-t 2 7-in. reel, 3000 pieces/reel surface mount ?40 to 85 5.000 a1321eua-t 3 bulk, 500 pieces/bag sip through hole a1321llhlt-t 2 7-in. reel, 3000 pieces/reel surface mount ?40 to 150 a1321lua-t 3 bulk, 500 pieces/bag sip through hole a1322llhlt-t 2 7-in. reel, 3000 pieces/reel surface mount ?40 to 150 3.125 a1322lua-t 3 bulk, 500 pieces/bag sip through hole a1323eua-t 3 bulk, 500 pieces/bag sip through hole ?40 to 85 2.500 a1323llhlt-t 2 7-in. reel, 3000 pieces/reel surface mount ?40 to 150 a1323lua-t 3 bulk, 500 pieces/bag sip through hole 1 contact allegro for additional packing options. 2 this variant is in production, however, it has been deemed pre-end of life. the product is approaching end of life. within a mi nimum of 6 months, the device will enter its final, last time buy, order phase. status change: january 31, 2011. suggested replacements: for the a 1321elhlt-t and the a1321llhlt-t use the a1324llhlx-t, for the a1322llhlt-t use the a1325llhlx-t, and for the a1323llhlt-t use the a1326llhlx-t . 3 variant is in production but has been determined to be not for new design. this classification indicates that sale of the varia nt is currently restricted to existing customer applications. the variant should not be purchased for new design applications because obsolesce nce in the near future is probable. samples are no longer available. status change: january 31, 2011. absolute maximum ratings characteristic symbol notes rating units supply voltage v cc * additional current draw may be observed at voltages above the minimum supply zener clamp voltage, v z(min) , due to the zener diode turning on. 8v output voltage v out 8v reverse supply voltage v rcc ?0.1 v reverse output voltage v rout ?0.1 v output sink current i out 10 ma operating ambient temperature t a range l ?40 to 150 oc maximum junction temperature t j (max) 165 oc storage temperature t stg ?65 to 170 oc
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 3 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com terminal list symbol number description package lh package ua vcc 1 1 connects power supply to chip vout 2 3 output from circuit gnd 3 2 ground package lh package ua pin-out drawings 23 1 2 1 3
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 4 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com device characteristics 1 over operating temperature (t a ) range, unless otherwise noted characteristic symbol test conditions min. typ. 2 max. units electrical characteristics; v cc = 5 v, unless otherwise noted supply voltage v cc(op) operating; tj < 165c 4.5 5.0 5.5 v supply current i cc b = 0, i out = 0 ? 5.6 8 ma quiescent voltage v out(q) b = 0, t a = 25oc, i out = 1 ma 2.425 2.5 2.575 v output voltage 3 v out(h) b = + x , i out = ?1 ma ? 4.7 ? v v out(l) b = ? x , i out = 1 ma ? 0.2 ? v output source current limit 3 i out(lm) b = ? x , v out 0 ?1.0 ?1.5 ? ma supply zener clamp voltage v z i cc = 11 ma = i cc(max) + 3 6 8.3 ? v output bandwidth bw ? 30 ? khz clock frequency f c ? 150 ? khz output characteristics; over v cc range, unless otherwise noted noise, peak-to-peak 4 v n a1321; c bypass = 0.1 f, no load ? ? 40 mv a1322; c bypass = 0.1 f, no load ? ? 25 mv a1323; c bypass = 0.1 f, no load ? ? 20 mv output resistance r out i out 1 ma ? 1.5 3 output load resistance r l i out 1 ma, vout to gnd 4.7 ? ? k output load capacitance c l vout to gnd ? ? 10 nf 1 negative current is de ned as conventional current coming out of (sourced from) the speci ed device terminal. 2 typical data is at t a = 25c. they are for initial design estimations only, and assume optimum manufacturing and application conditions. performance may vary for individual units, within the speci ed maximum and minimum limits. 3 in these tests, the vector x is intended to represent positive and negative elds suf cient to swing the output driver between fully off and saturated (on), respectively. it is not intended to indicate a range of linear operation. 4 noise speci cation includes both digital and analog noise.
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 5 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com magnetic characteristics 1,2 over operating temperature range, t a ; v cc = 5 v, i out = ?1 ma; unless otherwise noted characteristics symbol test condition min typ 3 max units 4 sensitivity 5 sens a1321; t a = 25oc 4.750 5.000 5.250 mv/g a1322; t a = 25oc 2.969 3.125 3.281 mv/g a1323; t a = 25oc 2.375 2.500 2.625 mv/g delta v out(q) as a func- tion of temperature v out(q)( t) de ned in terms of magnetic ux density, b ? ? 10 g ratiometry, v out(q) v out(q)( v) ? ? 1.5 % ratiometry, sens sens ( v) ? ? 1.5 % positive linearity lin+ ? ? 1.5 % negative linearity lin? ? ? 1.5 % symmetry sym ? ? 1.5 % ua package delta sens at t a = max 5 sens (tamax) from hot to room temperature ?2.5 ? 7.5 % delta sens at t a = min 5 sens (tamin) from cold to room temperature ?6 ? 4 % sensitivity drift 6 sens drift t a = 25c; after temperature cycling and over time ? 2 ? % lh package delta sens at t a = max 5 sens (tamax) from hot to room temperature ?5 ? 5 % delta sens at t a = min 5 sens (tamin) from cold to room temperature ?3.5 ? 8.5 % sensitivity drift 6 sens drift t a = 25c; after temperature cycling and over time ? 2 ? % 1 additional information on characteristics is provided in the section characteristics de nitions, on the next page. 2 negative current is de ned as conventional current coming out of (sourced from) the speci ed device terminal. 3 typical data is at t a = 25c, except for sens, and at x.x sens. typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. performance may vary for individual units, within the speci ed maximum and minimum limits. in addition, the typical values vary with gain. 4 10 g = 1 millitesla. 5 after 150oc pre-bake and factory programming. 6 sensitivity drift is the amount of recovery with time.
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 6 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com quiescent voltage output. in the quiescent state (no magnetic eld), the output equals one half of the supply voltage over the operating voltage range and the operating temperature range. due to internal component tolerances and thermal con- siderations, there is a tolerance on the quiescent voltage output both as a function of supply voltage and as a function of ambient temperature. for purposes of speci cation, the quiescent voltage output as a function of temperature is de ned in terms of mag- netic ux density, b, as: this calculation yields the device?s equivalent accuracy, over the operating temperature range, in gauss (g). sensitivity. the presence of a south-pole magnetic eld per- pendicular to the package face (the branded surface) increases the output voltage from its quiescent value toward the supply voltage rail by an amount proportional to the magnetic eld applied. conversely, the application of a north pole will decrease the output voltage from its quiescent value. this proportionality is speci ed as the sensitivity of the device and is de ned as: the stability of sensitivity as a function of temperature is de ned as: characteristic de nitions ratiometric. the a132x family features a ratiometric output. the quiescent voltage output and sensitivity are proportional to the supply voltage (ratiometric). the percent ratiometric change in the quiescent voltage output is de ned as: and the percent ratiometric change in sensitivity is de ned as: linearity and symmetry. the on-chip output stage is designed to provide a linear output with a supply voltage of 5 v. although application of very high magnetic elds will not damage these devices, it will force the output into a non-linear region. linearity in percent is measured and de ned as: and output symmetry as: v out(q)( ?) v out(q)( ) v out(q)( 25 oc ) sens ( 25 oc ) ? = (1) 2 b v out(?b) v out(+b ) sens ? = sens ( ?) sens ( ) sens ( 25 oc ) sens ( 25 oc ) ? = 100 % (2) (3) v out(q)(v cc ) v out(q)(5v) v out(q)( v) = 100 % v cc 5 v (4) v cc 5 v = 100 % sens ( v ) sens (v cc ) sens ( 5 v ) (5) ? = 100 % lin+ v out(+b) 2( v out(+b / 2) ? v out(q) ) v out(q) (6) ? = 100 % lin? v out(?b) 2( v out(?b / 2) ? v out(q) ) v out(q) (7) ? = 100 % sym v out(+b) v out(q) ? v out(?b) v out(q) (8)
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 7 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com typical characteristics (30 pieces, 3 fabrication lots) average supply current (i cc ) vs temperature v cc = 5 v 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 -40 -20 0 25 85 115 125 150 t a (c) i cc (ma) average positive linearity (lin+) vs temperature v cc = 5 v 95 96 97 98 99 100 101 102 103 104 105 -40 -20 0 25 85 115 125 150 t a (c) lin+ (%) average negative linearity (lin?) vs temperature v cc = 5 v 95 96 97 98 99 100 101 102 103 104 105 -40 -20 0 25 85 115 125 150 t a (c) lin ? (%) average ratiometry, v out(q)( v) vs temperature 99 99.2 99.4 99.6 99.8 100 100.2 100.4 100.6 100.8 101 -40 -20 0 25 85 115 125 150 t a (c) ratiometry (%) 4.5 to 5.0 v 5.5 to 5.0 v average ratiometry, sens ( v), vs temperature 99 99.2 99.4 99.6 99.8 100 100.2 100.4 100.6 100.8 101 -40 -20 0 25 85 115 125 150 t a (c) ratiometry (%) 4.5 to 5.0v 5.5 to 5.0v continued on the next page...
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 8 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com typical characteristics, continued (30 pieces, 3 fabrication lots) average absolute quiescent output voltage, v out(q) , vs temperature v cc = 5 v 2.425 2.45 2.475 2.5 2.525 2.55 2.575 -40 -20 0 25 85 115 125 150 t a (c) v out(q) (v) average absolute sensitivity, sens, vs temperature v cc = 5 v 2 2.5 3 3.5 4 4.5 5 5.5 6 -40 -20 0 25 85 115 125 150 t a (c) sens (mv/g) a1322 a1321 a1323 average delta quiescent output voltage, v out(q)( t) , vs temperature in readings at each temperature are relative to 25c v cc = 5 v -10 -8 -6 -4 -2 0 2 4 6 8 10 -40 -20 0 25 85 115 125 150 t a (c) v out(q)( t) (g) quiescent output voltage, v out(q) , vs v cc t a = 25c 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 4.5 5 5.5 v cc (v) v out(q) (v) 1321 1322 1323 average sensitivity, sens, vs v cc t a = 25c 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 4.5 5 5.5 v cc (v) sens (mv/g) 1321 1322 1323 average delta sensitivity, sens, vs temperature in readings at each temperature are relative to 25c v cc = 5 v -10 -8 -6 -4 -2 0 2 4 6 8 10 -40 -20 0 25 85 115 125 150 t a (c) sens (%)
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 9 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com thermal characteristics may require derating at maximum conditions, see application information characteristic symbol test conditions* value units package thermal resistance r ja package lh, 1-layer pcb with copper limited to solder pads 228 oc/w package lh, 2-layer pcb with 0.463 in. 2 of copper area each side connected by thermal vias 110 oc/w package ua, 1-layer pcb with copper limited to solder pads 165 oc/w *additional thermal information available on allegro website. 6 5 4 3 2 1 0 20 40 60 80 100 120 140 160 180 temperature (oc) maximum allowable v cc (v) power derating curve (r q ja = 228 oc/w) 1-layer pcb, package lh (r q ja = 110 oc/w) 2-layer pcb, package lh (r q ja = 165 oc/w) 1-layer pcb, package ua v cc(min) v cc(max) 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 20 40 60 80 100 120 140 160 180 temperature (c) power dissipation, p d (mw) power dissipation versus ambient temperature (r q ja = 165 oc/w) 1-layer pcb, package ua (r q ja = 228 oc/w) 1-layer pcb, package lh (r q ja = 110 oc/w) 2-layer pcb, package lh
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 10 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com power derating the device must be operated below the maximum junction temperature of the device, t j(max) . under certain combinations of peak conditions, reliable operation may require derating sup- plied power or improving the heat dissipation properties of the application. this section presents a procedure for correlating factors affecting operating t j . (thermal data is also available on the allegro microsystems web site.) the package thermal resistance, r ? ja , is a gure of merit sum- marizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. its primary component is the effective thermal conductivity, k, of the printed circuit board, including adjacent devices and traces. radiation from the die through the device case, r ? jc , is relatively small component of r ? ja . ambient air temperature, t a , and air motion are signi cant external factors, damped by overmolding. the effect of varying power levels (power dissipation, p d ), can be estimated. the following formulas represent the fundamental relationships used to estimate t j , at p d . p d = v in i in (1) ? ???????????????????????? t = p d r ? ja (2) t j = t a + t (3) for example, given common conditions such as: t a = 25c, v cc = 12 v, i cc = 4 ma, and r ? ja = 140 c/w, then: p d = v cc i cc = 12 v 4 ma = 48 mw ?? t = p d r ? ja = 48 mw 140 c/w = 7c t j = t a + ? t = 25c + 7c = 32c a worst-case estimate, p d(max) , represents the maximum allow- able power level (v cc(max) , i cc(max) ), without exceeding t j(max) , at a selected r ? ja and t a . example : reliability for v cc at t a = 150c, package ua, using minimum-k pcb. observe the worst-case ratings for the device, speci cally: r ? ja = 165c/w, t j(max) = 165c, v cc(max) = 5.5 v, and i cc(max) = 8 ma. calculate the maximum allowable power level, p d(max) . first, invert equation 3: ? t max = t j(max) ? t a = 165 c ? 150 c = 15 c this provides the allowable increase to t j resulting from internal power dissipation. then, invert equation 2: ???? p d(max) = ? t max r ? ja = 15c 165 c/w = 91 mw finally, invert equation 1 with respect to voltage: v cc(est) = p d(max) i cc(max) = 91 mw 8 ma = 11.4 v the result indicates that, at t a , the application and device can dissipate adequate amounts of heat at voltages v cc(est) . compare v cc(est) to v cc(max) . if v cc(est) v cc(max) , then reli- able operation between v cc(est) and v cc(max) requires enhanced r ? ja . if v cc(est) v cc(max) , then operation between v cc(est) and v cc(max) is reliable under these conditions.
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 11 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package lh, 3-pin (sot-23w) 0.55 ref gauge plane seating plane 0.25 bsc 0.95 bsc 0.95 1.00 0.70 2.40 2 1 a active area depth, 0.28 mm ref b c c b reference land pattern layout all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances branding scale and appearance at supplier discretion a pcb layout reference view standard branding reference view 1 branded face n = last two digits of device part number t = temperature code nnt 2.90 +0.10 ?0.20 8x 10 ref 0.180 +0.020 ?0.053 0.05 +0.10 ?0.05 0.25 min 1.91 +0.19 ?0.06 2.98 +0.12 ?0.08 1.00 0.13 0.40 0.10 44 for reference only; not for tooling use (reference dwg. 802840) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown d hall element, not to scale d d d 1.49 0.96 3
ratiometric linear hall effect sensor ics for high-temperature operation a1321, a1322, and a1323 12 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com for the latest version of this document, visit our website: www.allegromicro.com copyright ?2004-2010, allegro microsystems, inc. allegro microsystems, inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to per- mit improvements in the per for mance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegro?s products are not to be used in life support devices or systems, if a failure of an allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. the in for ma tion in clud ed herein is believed to be ac cu rate and reliable. how ev er, allegro microsystems, inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. package ua, 3-pin sip 23 1 0.79 ref 1.27 nom 2.16 max 0.51 ref 45 c 45 b e e e 2.04 1.44 gate burr area a b c dambar removal protrusion (6x) a d e d branding scale and appearance at supplier discretion hall element, not to scale active area depth, 0.50 mm ref for reference only; not for tooling use (reference dwg-9049) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown standard branding reference view = supplier emblem n = last two digits of device part number t = temperature code nnt 1 mold ejector pin indent branded face 4.09 +0.08 ?0.05 0.41 +0.03 ?0.06 3.02 +0.08 ?0.05 0.43 +0.05 ?0.07 15.75 0.51 1.52 0.05

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