Allegro Multimedia A1321 User's Manual
Contents
1. A1321 A1322 and A1323 Ratiometric Linear Hall Effect Sensor for High Temperature Operation Features and Benefits Description Temperature stable quiescent output voltage The A132X family of linear Hall effect sensors are optimized Precise recoverability after temperature cycling sensitive and temperature stable These ratiometric Hall effect Output voltage proportional to magnetic flux density sensors provide a voltage output that is proportional to the Ratiometric rail to rail output applied magnetic field The A132X family has a quiescent Improved sensitivity output voltage that is 50 of the supply voltage and output 4 5 to 5 5 V operation sensitivity options of 2 5mV G 3 125mV G and 5mV G The Immunity to mechanical stress features of this family of devices are ideal for use in the harsh Solid state reliability environments found in automotive and industrial linear and Robust EMC protection 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 Packages 3 pin SOT23W suffix LH and A proprietary dynamic offset cancellation technique with 3 pin SIP suffix UA an internal high frequency clock reduces the residual offset voltage normally caused by device2. Test Conditions Min Typ 2 Max Units Electrical Characteristics Voc 5 V unless otherwise noted Supply Voltage Vee op Operating Tj lt 165 C 4 5 5 0 5 5 V Supply Current lee B 0 lout 0 5 6 8 mA Quiescent Voltage Vout q B 0 Ta 25 C lout 1 MA 2 425 2 5 2 575 V Vout H B X lout 1 MA 4 7 V Output Voltage Tas ES ae 03 J Output Source Current Limit lout LM B X Vout gt 0 1 0 1 5 mA Supply Zener Clamp Voltage Vz lcc 11 MA lec max 3 6 8 3 V Output Bandwidth BW 30 kHz Clock Frequency fo 150 kHz Output Characteristics over Vcc range unless otherwise noted A1321 Crypass 0 1 pF no load 40 mV Noise Peak to Peak4 Vn A1322 Cbypass 9 1 pF no load 7 25 mV A1323 Chypass 0 1 UF no load 20 mV Output Resistance Rout lout S 1 MA 1 5 3 Q Output Load Resistance RL lout 1 MA VOUT to GND 4 7 kQ Output Load Capacitance CL VOUT to GND 10 nF 1 Negative current is defined as conventional current coming out of sourced from the specified device terminal 2 Typical data is at T 25 C They are for initial design estimations only and assume optimum manufacturing and application conditions Performance may vary for individual units within the specified maximum and minimum limits 3 In these tests the vector X is intended to represent positive and negative fields sufficient to swing the output driver between
3. fully OFF and saturated ON respectively It is NOT intended to indicate a range of linear operation 4 Noise specification includes both digital and analog noise Allegro MicroSystems Inc 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 Ratiometric Linear Hall Effect Sensor and A1323 for High Temperature Operation MAGNETIC CHARACTERISTICS over operating temperature range Ta Vcc 5 V lout 1 MA unless otherwise noted Characteristics Symbol Test Condition Min Typ Max Units4 A1321 Ty 25 C 4 750 5 000 5 250 mV G Sensitivity Sens A1322 Ty 25 C 2 969 3 125 3 281 mV G A1323 T4 25 C 2 375 2 500 2 625 mV G oa see a Vout qat Defined in terms of magnetic flux density B 10 G Ratiometry Vout Vout q AV E 41 5 Ratiometry Sens ASensav 1 5 Positive Linearity Lin 1 5 Negative Linearity Lin 1 5 Symmetry Sym 1 5 UA Package Delta Sens at T max ASenS Tamax From hot to room temperature 2 5 7 5 Delta Sens at T4 min ASensqtaminy From cold to room temperature 6 4 Sensitivity Drift Senspri Ta 25 C after temperature cycling and over time 2 LH Package Delta Sens at T max ASens qamax From hot to room temperature 5 5 Delta Sens at Ta min ASens qtaminy From cold to room temperature 3 5 8 5 Sens
4. output with a supply voltage of 5 V Although application of very high magnetic fields will not damage these devices it will force the output into a non linear region Linearity in percent is measured and defined as Vout B A Vout q 6 Lin x 100 2 Vout 4B 12 7 Vout q Vout B Vout q 7 Lin x 100 2 Vout B 2 Vout q and output symmetry as Vout B Vout q 8 Sym x 100 8 Vout q Vout B Allegro MicroSystems Inc 5 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 Ratiometric Linear Hall Effect Sensor and A1323 for High Temperature Operation Typical Characteristics 30 pieces 3 fabrication lots Average Supply Current Icc vs Temperature Vec 5V ae oe Icc mA N wo A o O N owas annnwvn anann oN o o Average Positive Linearity Lin vs Temperature Average Negative Linearity Lin vs Temperature Vec 5V Vec 5V Average Ratiometry Vout q av VS Temperature Average Ratiometry ASens y vs Temperature 4 5 to 5 0V 5 5 to 5 0V ee ee ee ee 4 5 to 5 0 V 5 5 to 5 0 V Ratiometry Ratiometry Continued on the next page Allegro MicroSystems Inc
5. overmolding temperature dependencies and thermal stress The high frequency clock allows for a greater sampling rate which results in higher fo accuracy and faster signal processing capability This technique f produces devices thathave an extremely stable quiescent output AA d voltage are immune to mechanical stress and have precise Not to scale Continued on the next page Functional Block Diagram voc l VOUT Dynamic Offset Cancellation ET Offset 0 1 uF Trim Control A1321 DS Rev 10 A1321 A1322 and A1323 Ratiometric Linear Hall Effect Sensor for High Temperature Operation Description continued recoverability after temperature cycling Having the Hall element andan amplifier on asingle chip minimizes many problems normally associated with low level analog signals 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 E s Output precision is obtained by internal gain and offset trim adjustments avaliable tatead FD tice Version Sue e ate tO eae made at end of line during the manufacturing process tin plated leadframe Selection Guide Part Number Packing Mounting S Ta S ss penn A1321ELHLT T 7 in reel 3000 pieces reel Surface Mount A1
6. 321EUA T Bulk 500 pieces bag SIP through hole eee 5 000 A1321LLHLT T 7 in reel 3000 pieces reel Surface Mount 40 to 150 A1321LUA T Bulk 500 pieces bag SIP through hole A1322ELHLT T 7 in reel 3000 pieces reel Surface Mount _40 to 85 A1322EUA T Bulk 500 pieces bag SIP through hole A1322LLHLT T 7 in reel 3000 pieces reel Surface Mount 4046 158 ale A1322LUA T Bulk 500 pieces bag SIP through hole A1323ELHLT T 7 in reel 3000 pieces reel Surface Mount A1323EUA T Bulk 500 pieces bag SIP through hole Se 500 A1323LLHLT T 7 in reel 3000 pieces reel Surface Mount 40 to 150 A1323LUA T Bulk 500 pieces bag SIP through hole Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic Notes Rating Units Additional current draw may be observed at Suppl Vote See ene ree v turning on Output Voltage 8 V Reverse Supply Voltage 0 1 V Reverse Supply Voltage 0 1 V Output Sink Current 10 mA Operating Ambient Temperature San 8 40 to 150 C Maximum Junction Temperature 165 C Storage Temperature 65 to 170 C Allegro MicroSystems Inc 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 and A1323 Ratiometric Linear Hall Effect Sensor for High Temperature Operation DEVICE CHARACTERISTICS over operating temperature T range unless otherwise noted Characteristic Symbol
7. 6 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 Ratiometric Linear Hall Effect Sensor and A1323 for High Temperature Operation Typical Characteristics continued 30 pieces 3 fabrication lots Average Absolute Quiescent Output Voltage Vout q vs Temperature Quiescent Output Voltage Vout q vs Vec Veco 5 V Ta 25 C XN a Vout q V Average Absolute Sensitivity Sens vs Temperature Average Sensitivity Sens vs Vec Veo 5V Ta 25 C ba a a a gt m aaa o em a1322 ER A1321 wo aonueoasa t A1323 gt E4 an Cc v on w o amp Sens mV G N ted a N Average Delta Quiescent Output Voltage Vout q AT vs Temperature Average Delta Sensitivity ASens vs Temperature 4 lnreadings at each temperature are relative to 25 C Ain readings at each temperature are relative to 25 C Veo 5V Veo 5V Vout q AT G Allegro MicroSystems Inc 7 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 Ratiometric Linear Hall Effect Sensor and A1323 for High Temperature Operation THERMAL CHARACTERISTICS may require derating at maximum conditions see ap
8. ckage UA Number Description Package LH Package UA p Connects power supply to chip Output from circuit Ground Allegro MicroSystems Inc 1 0 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 Ratiometric Linear Hall Effect Sensor and A1323 for High Temperature Operation Package UA 3 Pin SIP 14 99 15 75 Y 043 e 127 043 gt e 1 27 Package UA Matrix Leadframe Package UA Conventional Leadframe All dimensions nominal not for tooling use A Active Area Depth 0 50 mm Dimensions in millimeters i Exact case and lead configuration at supplier A Gate and tie bar burr area for conventional leadframe gate burr only discretion within limits shown Z Hall element not to scale Copyright 2004 2008 Allegro MicroSystems Inc The products described herein are manufactured under one or more of the following U S patents 5 045 920 5 264 783 5 442 283 5 389 889 5 581 179 5 517 112 5 619 137 5 621 319 5 650 719 5 686 894 5 694 038 5 729 130 5 917 320 and other patents pending Allegro MicroSystems Inc reserves the right to make from time to time such departures from the detail specifications as may be required to per mit improvements in the performance reliability or manufacturability of its products Before placing an order the user is cautioned to verify that the information bein
9. device specifically Roya 165 C W Timax 165 C Vccimax 5 5 V and Toc max 8mA Calculate the maximum allowable power level Ppmax First invert equation 3 AT max Timan Ta 165 C 150 C 15 C This provides the allowable increase to T resulting from internal power dissipation Then invert equation 2 Prax AT max Roya 15 C 165 C W 91 mW Finally invert equation with respect to voltage Veccest PDmax gt Teccmax 91mW 8mA 11 4V The result indicates that at T the application and device can dissipate adequate amounts of heat at voltages lt Vccest Compare Voceest to Vcc max If Vec est lt Vcc max then reli able operation between Vecrest and Vec max requires enhanced Roya If Voccest gt Vecc max gt then operation between Voccest and Vccmax S reliable under these conditions Allegro MicroSystems Inc 9 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 Ratiometric Linear Hall Effect Sensor and A1323 for High Temperature Operation Package LH 3 Pin SOT 23W 2 975 t _ 3 A 2 90 191 z Y 1 0 25 IN Seating Plane Gauge Plane All dimensions nominal not for tooling use 10 e i Dimensions in millimeters 095 049 0 05 A Active Area Depth A Hall element not to scale Pin out Drawings Package LH 3 1 2 Terminal List Pa
10. e application This section presents a procedure for correlating factors affecting operating T Thermal data is also available on the Allegro MicroSystems Web site The Package Thermal Resistance Ros is a figure 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 Rojc is relatively small component of Rg Ambient air temperature T and air motion are significant external factors damped by overmolding The effect of varying power levels Power Dissipation Pp can be estimated The following formulas represent the fundamental relationships used to estimate Tj at Pp Pp Vin X tn 1 AT Pp X Roja 2 T TAT 3 For example given common conditions such as Ta 25 C Voc 12 V Icc 4 mA and Roya 140 C W then AT Pp X Roja 48 mW x 140 C W 7 C Ty Ta AT 25 C 7 C 32 C A worst case estimate Ppimax represents the maximum allow able power level Vec max gt Lcccmax Without exceeding Timax at a selected Ros and T4 Ratiometric Linear Hall Effect Sensor for High Temperature Operation Example Reliability for Voc at Ta 150 C package UA using minimum K PCB Observe the worst case ratings for the
11. ecification the quiescent voltage output as a function of temperature is defined in terms of mag netic flux density B as Vout qy T Vout qy 25 c AVout qyaT nan 1 25 C This calculation yields the device s equivalent accuracy over the operating temperature range in gauss G Sensitivity The presence of a south pole magnetic field 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 field applied Conversely the application of a north pole will decrease the output voltage from its quiescent value This proportionality is specified as the sensitivity of the device and is defined as Vou B Vout B 2 2B Sens The stability of sensitivity as a function of temperature is defined as Senser Sensy25 rs CO x 100 3 ASens at Sens S 25 C 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 defined as Voua Veo Voos 4 AV x 100 out q AV Vec 5V o and the percent ratiometric change in sensitivity is defined as Sens ycc Sensgsy co GV x 100 5 Vec 5 V ASensay Linearity and Symmetry The on chip output stage is designed to provide a linear
12. g 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 information included herein is believed to be accurate and reliable However Allegro MicroSystems Inc assumes no responsibility for its use nor for any infringement of patents or other rights of third parties which may result from its use For the latest version of this document visit our website www allegromicro com Allegro MicroSystems Inc 1 1 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com
13. itivity Drift Sensprif Ta 25 C after temperature cycling and over time 2 1 Additional information on chracteristics is provided in the section Characteristics Definitions on the next page 2 Negative current is defined as conventional current coming out of sourced from the specified device terminal 3 Typical data is at T 25 C except for ASens 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 specified maximum and minimum limits In addition the typical values vary with gain 410 G 1 millitesla 5 After 150 C pre bake and factory programming 6 Sensitivity drift is the amount of recovery with time Allegro MicroSystems Inc 4 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 and A1323 Ratiometric Linear Hall Effect Sensor for High Temperature Operation Characteristic Definitions Quiescent Voltage Output In the quiescent state no magnetic field 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 sp
14. plication information Characteristic Symbol Test Conditions Value Units Package LH 1 layer PCB with copper limited to solder pads Package LH 2 layer PCB with 0 463 in 2 of copper area each side connected by thermal vias Package Thermal Resistance Package UA 1 layer PCB with copper limited to solder pads Additional thermal information available on Allegro website Power Derating Curve Vec max 1 layer PCB Package LH Roya 228 C W 1 layer PCB Package UA 4 Raja 165 C W 2 layer PCB Package LH Roya 110 C W Voc min Maximum Allowable Vcc V 20 40 60 80 100 120 140 160 180 Temperature C Power Dissipation versus Ambient Temperature 1900 1800 1700 1600 1500 1400 1300 1200 1100 4 1000 4 900 800 5 700 600 4 500 400 4 300 200 m 100 0 T T T T T T T 20 40 60 80 100 120 140 160 180 Temperature C Power Dissipation Pp mW Allegro MicroSystems Inc 8 115 Northeast Cutoff Worcester Massachusetts 01615 0036 U S A 1 508 853 5000 www allegromicro com A1321 A1322 and A1323 Power Derating The device must be operated below the maximum junction temperature of the device T ymax Under certain combinations of peak conditions reliable operation may require derating sup plied power or improving the heat dissipation properties of th
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