A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation The A132X family of linear Hall-effect sensors are optimized, sensitive, and temperature-stable. These ratiometric Hall-effect sensors 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 2.5mV/G, 3.125mV/G, and 5mV/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. Package UA, 3-pin SIP 1. VCC 2. GND 3. VOUT 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 lowimpedance output stage. 1 2 3 Package LH, 3-pin Surface Mount 1. VCC 2. VOUT 3. GND 3 1 2 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 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). Features and Benefits ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC .......................................... 8 V* Reverse-Battery Voltage, VRCC....................... –0.1 V Reverse-Output Voltage, VROUT ..................... –0.1 V Output Sink Current, IOUT ............................. 10 mA Operating Temperature Ambient, TA, Range E.................. –40ºC to 85ºC Ambient, TA, Range L................ –40ºC to 150ºC Maximum Junction, TJ(max)........................165ºC Storage Temperature, TS .................. –65ºC to 170ºC *Additional current draw may be observed at voltages above the minimum supply Zener clamp voltage, VZ(min), due to the Zener diode turning on. A1321-DS Rev. 3 Temperature-stable quiescent output Improved sensitivity voltage 4.5 to 5.5 V operation Precise recoverability after temperature cycling Immunity to mechanical stress Output voltage proportional to magnetic flux Solid-state reliability density Robust EMC protection Ratiometric rail-to-rail output Use the following complete part numbers when ordering: Part Number Package A1321EUA A1321ELH A1321LUA A1321LLH A1322EUA A1322ELH A1322LUA A1322LLH A1323EUA A1323ELH A1323LUA A1323LLH SIP Surface Mount SIP Surface Mount SIP Surface Mount SIP Surface Mount SIP Surface Mount SIP Surface Mount Ambient Sensitivity, Typ. –40ºC to 85ºC 5.000 mV/G –40ºC to 150ºC –40ºC to 85ºC 3.125 mV/G –40ºC to 150ºC –40ºC to 85ºC 2.500 mV/G –40ºC to 150ºC Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation Functional Block Diagram V+ Amp Filter Dynamic Offset Cancellation VCC Gain VOUT Out Offset 0.1 µF Trim Control GND Terminal List Symbol VCC VOUT GND Description Connects power supply to chip Output from circuit Ground Number Package LH Package UA 1 1 2 3 3 2 2 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation DEVICE CHARACTERISTICS1 over operating temperature (TA) range, unless otherwise noted Characteristic Symbol Test Conditions Min. Electrical Characteristics; VCC = 5 V, unless otherwise noted Supply Voltage Vcc(op) Operating; Tj < 165°C 4.5 Supply Current Icc B = 0, Iout = 0 – Quiescent Voltage Vout(q) B = 0, TA = 25ºC, Iout = 1 mA 2.425 Vout(H) B = +X, Iout = –1 mA – Output Voltage3 B = –X, Iout = 1 mA – Vout(L) 3 Output Source Current Limit Iout(LM) B = –X, Vout → 0 –1.0 Supply Zener Clamp Voltage VZ Icc = 11 mA = Icc(max) + 3 6 Output Bandwidth BW – Clock Frequency fC – Output Characteristics; over VCC range, unless otherwise noted A1321; Cbypass = 0.1 µF, no load – Noise, Peak-to-Peak4 VN A1322; Cbypass = 0.1 µF, no load – A1323; Cbypass = 0.1 µF, no load – Output Resistance Rout Iout ≤ ±1 mA – Output Load Resistance RL Iout ≤ ±1 mA, VOUT to GND 4.7 VOUT to GND – Output Load Capacitance CL Typ.2 Max. Units 5.0 5.6 2.5 4.7 0.2 –1.5 8.3 30 150 5.5 8 2.575 – – – – – – V mA V V V mA V kHz kHz – – – 1.5 – – 40 25 20 3 – 10 mV mV mV Ω kΩ nF 1 Negative current is defined as conventional current coming out of (sourced from) the specified device terminal. data is at TA = 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 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. 2 Typical 3 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation MAGNETIC CHARACTERISTICS1,2 over operating temperature range, TA; VCC = 5 V, Iout = –1 mA; unless otherwise noted Max Units4 Characteristics Symbol Test Condition Min Typ3 A1321; TA = 25ºC 4.750 5.000 5.250 mV/G 5 Sensitivity Sens 2.969 3.125 3.281 mV/G A1322; TA = 25ºC 2.375 2.500 2.625 mV/G A1323; TA = 25ºC Delta Vout(q) as a funcVout(q)(∆T) Defined in terms of magnetic flux density, B – – ±10 G tion of temperature Vout(q)(∆V) – – ±1.5 % Ratiometry, Vout(q) 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 TA = max5 ∆Sens(TAmax) From hot to room temperature –2.5 – 7.5 % Delta Sens at TA = min5 ∆Sens(TAmin) From cold to room temperature –6 – 4 % Sensitivity Drift6 SensDrift TA = 25°C; after temperature cycling and over time – 1 2 % LH Package Delta Sens at TA = max5 ∆Sens(TAmax) From hot to room temperature –5 – 5 % Delta Sens at TA = min5 ∆Sens(TAmin) From cold to room temperature –3.5 – 8.5 % Sensitivity Drift6 SensDrift TA = 25°C; after temperature cycling and over time – 0.328 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 ∆Sens, and at x.x Sens. Typical data are for initial design estimations only, and assume optimum A 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. 4 10 G = 1 millitesla. 5 After 150ºC pre-bake and factory programming. 6 Sensitivity drift is the amount of recovery with time. 4 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/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 considerations, 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 specification, the quiescent voltage output as a function of temperature is defined in terms of magnetic flux density, B, as: ∆Vout(q)(∆Τ) = ∆Vout(q)(ΤΑ) – ∆Vout(q)(25ºC) Sens(25ºC) Sens(25ºC) × 100% VCC ÷ 5 V × 100% (4) ∆Sens(VCC) ÷ ∆Sens(5V) VCC ÷ 5 V × 100% (5) 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 fields will not damage these devices, it will force the output into a non-linear region. Linearity in percent is measured and defined as: Lin+ = Lin– = The stability of sensitivity as a function of temperature is defined as: ∆Sens(∆Τ) = ∆Vout(q)(VCC) ÷ ∆Vout(q)(5V) and the percent ratiometric change in sensitivity is defined as: (2) 2B Sens(ΤΑ) – Sens(25ºC) ∆Vout(q)(∆V) = ∆Sens(∆V) = Sensitivity. The presence of a south-pole magnetic field perpendicular 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: Sens = The percent ratiometric change in the quiescent voltage output is defined as: (1) This calculation yields the device’s equivalent accuracy, over the operating temperature range, in gauss (G). ∆Vout(–B) – ∆Vout(+B) Ratiometric. The A132X family features a ratiometric output. The quiescent voltage output and sensitivity are proportional to the supply voltage (ratiometric). ∆Vout(+B) – ∆Vout(q) 2(∆Vout(+B / 2) – Vout(q) ) ∆Vout(–B) – ∆Vout(q) 2(∆Vout(–B / 2) – Vout(q) ) × 100% × 100% (6) (7) and output symmetry as: (3) Sym = ∆Vout(+B) – ∆Vout(q) ∆Vout(q) – Vout(–B) × 100% (8) 5 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation Typical Characteristics 150 125 115 85 25 0 -20 Average Supply Current (ICC) vs Temperature Vcc = 5 V 8 7.5 7 6.5 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 -40 ICC (mA) (30 pieces, 3 fabrication lots) TA (°C) Average Positive Linearity (Lin+) vs Temperature Vcc = 5 V 104 104 103 103 102 102 101 Lin– (%) 100 99 101 100 98 99 98 97 97 96 96 150 125 115 85 TA (°C) Average Ratiometry, VOUT(q)(∆V) vs Temperature Average Ratiometry, ∆Sens(∆V), vs Temperature 101 101 4.5 to 5.0V 5.5 to 5.0V 100.8 100.8 4.5 to 5.0 V 5.5 to 5.0 V 100.6 100.4 TA (°C) 150 150 125 115 85 25 0 99 -20 99.2 99 -40 99.4 99.2 125 99.6 99.4 115 99.6 100 99.8 85 100 99.8 100.2 25 100.2 0 Ratiometry (%) 100.4 -40 100.6 Ratiometry (%) 25 -40 TA (°C) 0 95 150 125 115 85 25 0 -20 -40 95 -20 Lin+ (%) Average Negative Linearity (Lin–) vs Temperature Vcc = 5 V 105 -20 105 TA (°C) Continued on the next page... 6 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor 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 Vcc TA = 25°C Vcc = 5 V 2.575 3 2.9 2.55 2.7 Vout(q) (V) Vout(q) (V) 2.8 2.525 2.5 2.475 2.6 1321 1322 1323 2.5 2.4 2.3 2.45 2.2 2.1 2 150 125 115 85 25 0 -20 -40 2.425 4.5 TA (°C) 6 5.5 5.5 5 1321 1322 1323 4.5 4.5 A1322 4 4 Sens (mV/G) A1321 A1323 3.5 3 3.5 3 2.5 2 2.5 1.5 1 150 125 115 85 25 0 -20 -40 2 4.5 5 Vcc (V) TA (°C) Average Delta Quiescent Output Voltage, Vout(q)(∆T), vs Temperature ∆ in readings at each temperature are relative to 25°C Vcc = 5 V 8 6 6 4 4 0 -6 TA (°C) 150 125 115 85 25 0 -10 -20 -8 -10 -40 -8 150 -4 -6 125 -4 115 -2 0 -2 2 -20 0 -40 2 ∆Sens (%) Vout(q)(∆T) (G) Average Delta Sensitivity, ∆Sens, vs Temperature ∆ in readings at each temperature are relative to 25°C Vcc = 5 V 10 8 5.5 85 Sens (mV/G) 5 10 5.5 Average Sensitivity, Sens, vs Vcc TA = 25°C 25 6 Average Absolute Sensitivity, Sens, vs Temperature Vcc = 5 V 5 Vcc (V) TA (°C) 7 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation Package LH, 3-Pin; (SOT-23W) 3.10 .122 2.90 .114 1.49 .059 NOM 3 8º 0º 0.28 .011 NOM 0.70 .028 BSC 0.20 .008 0.13 .005 C 0.96 .038 NOM 2.10 .083 1.85 .073 2.40 .094 BSC A 0.25 .010 MIN 3.00 .118 2.70 .106 1 1.00 .039 BSC 2 0.95 .037 BSC 0.25 .010 BSC Seating Plane Gauge Plane 0.50 .020 0.30 .012 1.13 .045 0.87 .034 0.55 .022 REF A Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only Hall element B Active Area Depth 0.28 [.011] C Fits SC–59A Solder Pad Layout 0.15 .006 0.00 .000 0.95 .037 BSC Package UA, 3-Pin; (TO-92) .164 4.17 .159 4.04 45° BSC .0195 0.50 NOM .0805 2.04 NOM .122 3.10 .117 2.97 .062 1.57 .058 1.47 .0565 1.44 NOM 45° BSC B .085 2.16 MAX .640 16.26 .600 15.24 .031 0.79 REF A 1 2 3 .017 0.44 .014 0.35 .019 0.48 .014 0.36 .050 1.27 BSC Dimensions in inches Metric dimensions (mm) in brackets, for reference only A Dambar removal protrusion B Hall element 8 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1321/A1322/A1323 Ratiometric Linear Hall Effect Sensor for High-Temperature Operation 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 permit improvements in the performance, 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 products are not authorized for use as critical components in life-support devices or systems without express written approval. 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. Copyright © 2004, Allegro MicroSystems, Inc. 9 A1321-DS Rev. 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com