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A1421_05 ALLEGRO

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Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 16

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A1421, A1422, A1423 A1421a-DS Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com Allegro MicroSystems, Inc. AB SO LUTE MAX I MUM RAT INGS Operating Temperature *Refer to Power Derating section. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor Package K, 4-pin SIP Features and Beneﬁ ts

Integrated tracking capacitor
Senses motion of ring magnet or ferrous targets
Wide operating temperature range
Operation with magnetic input signal frequency from 20 Hz to 30 kHz
EMI/ESD-resistant
Large effective air gaps
4.0 to 26.5 V supply operating range
Output compatible with both TTL and CMOS logic families
Reverse battery protection
Resistant to mechanical and thermal stress
Accurate true zero crossing switchpoint (A1421 only)
High vibration immunity, in running mode (A1423 only) 1. VCC 2. VOUT 3. TEST 4. GND 1234 The A1421, A1422 and A1423 are ac-coupled Hall-effect sensors which include monolithic integrated circuits that switch in response to changing differential magnetic ﬁ elds created by rotating ring magnets or, when coupled with a magnet, by ferrous targets. This family of devices also includes an integrated capacitor that provides the high accuracy of analog sensing without an external ﬁ lter capacitor. This reduces cost and components, while improving the reliability of the ﬁ nal sen- sor solution. Magnetic ﬁ eld changes are sensed by two integrated Hall transducers and then are differentially ampliﬁ ed on the chip. Differential sensing provides immunity to radial vibration, within the device operating air gap range, by rejection of this common-mode signal change. Steady-state system offsets are eliminated using an on-chip differential bandpass ﬁ lter with integrated capacitor. This ﬁ lter also pro- vides relative immunity to interference from electromagnetic sources. The device utilizes advanced temperature compensation for the high-pass ﬁ lter, sensitivity, and Schmitt trigger switchpoints to guarantee optimal operation to low frequen- cies over a wide range of air gaps and temperatures. Each device includes: a voltage regulator, two Hall transducers, temperature com- pensating circuitry, a low-level ampliﬁ er, bandpass ﬁ lter, Schmitt trigger, and an output driver. The on-board regulator permits operation with supply voltages from 4.0 to 26.5 V . The output stage can switch 20 mA over the full frequency response range of the sensor, and is compatible with TTL and CMOS logic circuits. Continued on next page…

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Product Selection Guide Part Number Pb-free1 Output Switching at BDIFF = 0 Switchpoints Symmetry Packing2 BDiff Increasing BDiff Decreasing BOP(typ) (G) BRP(typ) (G) BOP(max)+ BRP(min) (G) BOP(typ)+ BRP(typ) (G) BOP(min)+ BRP(max) (G) A1421LK-T Yes Low (On) to High (Off) High (Off) to Low (On) 15 0 15 15 7.5 Bulk, 500 pieces/bagA1422LK-T Yes High (Off) to Low (On) Low (On) to High (Off) 15 –15 0 0 0 A1423LK A1423LK-T Yes High (Off) to Low (On) Low (On) to High (Off) 65 –65 0 0 0 1Pb-based variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A1421LK and A1422LK. 2Contact Allegro for additional packing options. The devices in this family differ from each other in their switchpoint speci? cations and their switching polarity. The A1421 has a small hysteresis and asymmetrical switchpoints, with one switchpoint at the zero-crossing. The A1422 has a small hysteresis and symmetrical switchpoints, both near the zero- crossing. The A1423 offers high vibration immunity, by means of its larger hysteresis that establishes symmetrical switchpoints further from the zero-crossing. The output polarities are shown in the Product Selection Guide table. This variety of options provides ? exibility for achieving solu- tions for a wide range of applications, including automotive transmission and crankshaft speed sensing. The device package has an operating ambient temperature range –40 °C to 150°C , and is provided in a 4-pin plastic SIP. Each package is available in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Functional Block Diagram Hall Amp Regulator Bandpass Filter Integrated Tracking Capacitor VOUT (Pin 2) VCC (Pin 1) GND (Pin 4) 0.1 uF VS+ Diagnostic Circuitry Gain Stage Dual Hall Transducers Comparator TEST (Pin 3) (Required) VREF

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 OPERATING CHARACTERISTICS Valid at TA = – 40ºC to 150ºC, TJ ≤ 165°C; over operational air gap range and VCC within operating range, unless otherwise noted. Typical operating parameters: VCC = 12 V and TA = 25°C. Characteristic Symbol Test Conditions Min. Typ. Max. Units

ELECTRICAL CHARACTERISTICS

Supply Voltage V CC Operating; TJ < TJ(max) 4.0 12 26.5 V Supply Current I CC – 4.2 7.0 mA Output Saturation Voltage V OUT(SAT) ISINK = 20 mA – 140 400 mV Output Leakage Current I OFF VOUT = 24 V, Bdiff = 0 – – 5 μA PROTECTION COMPONENT CHARACTERISTICS Reverse Supply Current I RCC VCC = –18 V – – –1 mA Supply Zener Current I ZSupply VS = 28 V – – 10 mA Supply Zener Clamp Voltage1 VZSupply ICC = 10 mA, TA = 25°C 28 33 37 V Output Zener Current I ZOutput VOUT = 28 V – – 3 mA Output Zener Clamp Voltage V ZOutput IOUT = 3 mA, TA = 25°C 28 – – V Output Short Circuit Current Limit I OUTS(lim) – – 50 mA RESPONSE CHARACTERISTICS Power-On State POS t < t Response – High – V Power-On Time2,6 tPO VCC > VCC(min) – 4.5 9 ms Settling Time3,6 tSettling fBdiff ≥ 100 Hz 0 – 50 ms Response Time6 tResponse Equal to tPO + tSettling; fBdiff ≥ 100 Hz 4.5 – 59 ms Upper Corner Frequency f CU –3 dB, single pole 20 – – kHz Lower Corner Frequency f CL –3 dB, single pole – – 20 Hz OUTPUT CHARACTERISTICS Output Rise Time4 tr RPU = 1 kΩ, COUTC2 = 10 pF – – 200 ns Output Fall Time t f RPU = 1 kΩ, ISINK = 20 mA, COUTC2 = 10 pF – – 200 ns Continued on next page.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 OPERATING CHARACTERISTICS, continued Valid at TA = – 40ºC to 150ºC, TJ ≤ 165°C; over operational air gap range and VCC within operating range, unless otherwise noted. Typical operating parameters: VCC = 12 V and TA = 25°C. Characteristic Symbol Test Conditions Min. Typ. Max. Units MAGNETIC CHARACTERISTICS5,6 Operate Point B OP 1421, Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from low (on) to high (off) 0.0 15.0 27.5 G 1422, Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from high (off) to low (on) 5.0 15.0 35.0 G 1423, Bdiff increasing, fBdiff = 200 Hz, Bdiff = 200 Gp-p VOUT switches from high (off) to low (on) 10.0 65.0 100.0 G Release Point B RP 1421, Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from high (off) to low (on) -12.5 0.0 7.5 G 1422, Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p VOUT switches from low (on) to high (off) -35.0 -15.0 -5.0 G 1423, Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 200 Gp-p VOUT switches from low (on) to high (off) -100.0 -65.0 -10.0 G Hysteresis B HYS 1421, fBdiff = 200 Hz, Bdiff = 50 Gp-p 5 15 35 G 1422, fBdiff = 200 Hz, Bdiff = 50 Gp-p – 30 – G 1423, fBdiff = 200 Hz, Bdiff = 200 Gp-p – 130 – G Applied Magnetic Field7 Bdiff Differential p-p magnetic ﬁ eld – – 1250 G 1ICC is equivalent to ICC(max) + 3 mA. 2Time required to initialize device. 3Time required for the output switchpoints to be within speciﬁ cation. 4Output Rise Time will be dominated by the RC time constant. 5For lower frequencies, the absolute values of BOP, BRP, and BHYS may decrease due to delay induced by the high-pass ﬁ lter. 6 See Deﬁ nitions of Terms section. 7 Exceeding the maximum magnetic ﬁ eld may result in compromised absolute accuracy.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance RθJA Minimum-K PCB (single-sided with copper limited to solder pads) 177 ºC/W *In still air. Additional thermal information available on Allegro Web site. 20 40 60 80 100 120 140 160 180 Maximum Allowable VCC (V) TJ(max) = 165ºC; ICC =I CC(max) Power Derating Curve (RθJA = 177 ºC/W) Minimum-K PCB VCC(min) VCC(max) 20 40 60 80 100 120 140 160 180 Temperature (°C) Power Dissipation, PD (mW) TJ(max) = 165ºC; VCC =V CC(max);I CC =I CC(max) Maximum Power Dissipation, PD(max) θJA = 177 ºC/W) Minimum-K PCB 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 The following provide additional information about some of the parameters cited. For additional information, visit the Allegro Web site at www.allegromicro.com. Applied Magnetic Field, B diff – The differential magnetic ﬂ ux density, which is calculated as the arithmetic difference of the ﬂ ux densities observed by each of the two Hall elements. fBdiff is the input signal frequency. Output Off Switchpoint (Operate Point), BOP – The value of increasing differential magnetic ﬂ ux density at which the device output switches from low to high (A1421) or high to low (A1422 and A1423). Output On Switchpoint (Release Point), BRP – The value of decreasing differential magnetic ﬂ ux density at which the device output switches from high to low (A1421) or from low to high (A1422 and A1423). Power-On Time, tPO – The time needed by the device, after power is applied, to initialize all circuitry necessary for proper operation. Settling Time, tSettling – The time required by the device, after tPO, and after a valid magnetic signal has been applied, to provide proper output transitions. Settling time is a function of magnetic offset, offset polarity, signal phase, signal frequency, and signal amplitude. Supply Current (on), ICC(on) – The current draw of the device with the output transitor is turned on. Supply Current (off), ICC(off) – The current draw of the device with the output transitor is turned off. Response Time, tResponse – The total time required for generating zero-crossing output transitions after initialization (the sum of Power-on Time and Settling Time). Deﬁ nitions of Terms

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Empirical Results 4.5 20.0 12.0 VCC (V) 4.5 20.0 12.0 VCC (V) 4.5 20.0 12.0 VCC (V) 150 –40 TA (ºC) 150 –40 TA (ºC) 150 –40 TA (ºC) ICC(OFF) by TA Ambient Temperature, TA (ºC) Current (mA) 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 –50 0 50 100 150 200 Over V CC Range ICC(OFF) by VCC Supply Voltage, VCC (V) Current (mA) 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 0 5 10 15 20 25 Over T A Range ICC(ON) by VCC Supply Voltage, VCC (V) Current (mA) 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 0 5 10 15 20 25 Over T A Range Supply Voltage, VCC (V) 0 5 10 15 20 25 ICC(ON) by TA Ambient Temperature, TA (ºC) Current (mA) 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 –50 0 50 100 150 200 Over V CC Range VOUT(SAT) by TA Ambient Temperature, TA (ºC) Voltage (mV) 500 450 400 350 300 250 200 150 100 –50 0 50 100 150 200 Over V CC Range; ISINK =2 0m A VOUT(SAT) by VCC Voltage (mV) 500 450 400 350 300 250 200 150 100 Over T A Range; ISINK =2 0m A Continued on next page.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Simulation Results Continued on next page.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Simulation Results, continued Continued on next page.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Simulation Results, continued

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Sensor Evaluation: EMC Characterization Test Name Reference Speci ﬁ cation ESD – Human Body Model* AEC-Q100-002 ESD – Machine Model AEC-Q100-003 Conducted Transients ISO 7637-1 Direct RF Injection ISO 11452-7 Bulk Current Injection ISO 11452-4 TEM Cell ISO 11452-3 *ESD test is done with no external components. Please contact Allegro MicroSystems for EMC performance information. (EMC test results are available after review of ﬁ rst silicon.) Vs VCC TEST VOUTGND A1421, A1422 or A1423 Component Value Units R1* 1k Ω R2 100 Ω C1 0.1 μF C2 0.1 ηF *Pull-up resistor not required for protection but for normal operation. Recommended EMC test circuit. Test circuit recommended conﬁ guration may change after evaluation of ﬁ rst silicon.

ferential sensors that can be used in a wide range of applications. crosses BRP while decreasing (the negative direction). switching on noise or target jitter. PO, the output signal, VOUT, is high. settling time, tSettling, has also elapsed. Figure 1. Typical output characteristics with dual comparator operation. The example shown is for the A1421. Characteristics shown without delay, see characteristic data charts for delay and phase shift contributions.

1421 Output Signal, VOUT

1421 Switching State

1422 Switching State

1423 Switching State

Figure 2. Comparative typical output characteristics. This chart illustrates the switchpoints and the output polarities of the A1421, A1422, and the A 1423. Characteristics shown without delay, see characteristic data charts for delay and phase shift contributions. remote-sensing environments. TEST, must be connected externally to the GND terminal.

4 VOUT

Figure 3. Basic application circuit. A pull-up resistor, RPU, is required

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Power Derating The device must be operated below the maximum junction temperature of the device, TJ(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, RθJA, is a ﬁ 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 θJC, is relatively small component of RθJA. Ambient air temperature, TA, and air motion are signiﬁ cant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate TJ, at PD. PD = VIN × IIN (1) Δ T = PD × RθJA (2) T J = TA + ΔT (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 4.2 mA, and RθJA = 177 °C/W, then: P D = VCC × ICC = 12 V × 4.2 mA = 50 mW Δ T = PD × RθJA = 50 mW × 177 °C/W = 9°C T J = TA + ΔT = 25°C + 9°C = 34°C A worst-case estimate, PD(max), represents the maximum allow- able power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RθJA and TA. Example Reliability for VCC at TA = 150°C, package L-I1, using minimum- K PCB Observe the worst-case ratings for the device, speciﬁ cally: RθJA = 177°C/W, TJ(max) = 165°C, VCC(max) = 26.5 V , and ICC(max) = 7.0 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: ΔT max = TJ(max) – TA = 165 °C – 150 °C = 15 °C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = ΔTmax ÷ RθJA = 15°C ÷ 177 °C/W = 91 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(max) = 91 mW ÷ 7.0 mA = 13 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli- able operation between VCC(est) and VCC(max) requires enhanced RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.

A1421-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Allegro MicroSystems, Inc. High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor A1421, A1422, A1423 Package K, 4-pin SIP 5.28 5.16 .208 .203 3.51 3.38 .138 .133 1.60 1.50 .063 .059 15.24 14.23 .600 .560 0.48 0.36 .019 .014 .045 MIN 1.14 .085 MAX 2.16 .021 MAX 0.53 .050 NOM 1.27 .033 NOM 0.84 0.44 0.35 .017 .014 B 24 31 A A B Dambar removal protrusion (8X) Active Area Depth .0165 [0.42] NOM C C Ejector mark on opposite side Dimensions in inches Millimeters in brackets, for reference only Case dimensions exclusive of mold flash or gate burrs Exact case and lead configuration at supplier discretion within limits shown .0866 NOM 2.20 .0592 NOM 1.50 E1 E2 .0507 NOM 1.29 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 de par tures from the detail spec i ﬁ ca tions as may be required to permit 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 products are not authorized for use as critical components in life-support devices or sys tems without express written approval. 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. Copyright © 2004, 2005 Allegro MicroSystems, Inc.

Selected Specification

Allegro MicroSystems A1423LK overview.

Summary

High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor

Description

High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor

Source title A1423LK Datasheet(PDF) - Allegro MicroSystems

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