A1152-F, A1153-F, A1155-F, and A1156-F Chopper-Stabilized, Two-Wire Hall-Effect Switches Description Features and Benefits ▪AEC-Q100 automotive qualified ▪Factory-set temperature coefficient (TC) for use with ferrite magnets ▪High-speed, 4-phase chopper stabilization ▪Low switchpoint drift throughout temperature range ▪Low sensitivity to thermal and mechanical stresses ▪On-chip protection ▫Supply transient protection ▫Reverse-battery protection ▫On-board voltage regulator ▫3 to 24 V operation ▪Solid-state reliability The A1152-F, A1153-F, A1155-F, and A1156-F comprise a family of two-wire, unipolar, Hall-effect switches, which are factory-trimmed to optimize magnetic switchpoint accuracy. These devices are produced on the Allegro™ advanced BiCMOS wafer fabrication process, which implements a patented high-frequency, 4-phase, chopper stabilization technique. This technique achieves magnetic stability over the full operating temperature range, and eliminates offsets inherent in devices with a single Hall element that are exposed to harsh application environments. The A115x family has a number of automotive applications. These include sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Continued on the next page… Two-wire unipolar switches are particularly advantageous in cost-sensitive applications because they require one less wire for operation versus the more traditional open-collector output switches. Additionally, the system designer inherently gains diagnostics because there is always output current flowing, which should be in either of two narrow ranges. Any current level not within these ranges indicates a fault condition. Packages: 2-Pin, Ultra-Mini SIP (suffix UB) 1.5 mm × 4 mm × 4 mm Continued on the next page… Not to scale Functional Block Diagram 0.1 µF VCC Regulator To all subcircuits Amp Sample and Hold Dynamic Offset Cancellation Clock/Logic Low-Pass Filter Schmitt Trigger Polarity GND A1152-F-DS, Rev. 2 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F Features and Benefits (continued) ▪Robust EMC and ESD performance ▪Industry-leading ISO 7637-2 performance through use of proprietary, 40 V clamping structures ▪Extended Operating Ambient temperature range, –40°C to 150°C ▪UB package with integrated 0.1 µF bypass capacitor Description (continued) The UB is a 2-pin, ultra-mini, single inline package (SIP) for through-hole mounting, and it is lead (Pb) free, with 100% mattetin leadframe plating. Selection Guide Part Number Packing Package Output (ICC) in South Polarity Field Supply Current at ICC(L) (mA) Magnetic Operate Point, BOP, at TA = 25°C (G) A1152LUBTN-F-T 13-in. reel, 4000 pieces/reel 2-pin SIP through-hole Low 5 to 6.9 58 to 100 A1153LUBTN-F-T 13-in. reel, 4000 pieces/reel 2-pin SIP through-hole High 5 to 6.9 58 to 100 A1155LUBTN-F-T 13-in. reel, 4000 pieces/reel 2-pin SIP through-hole Low 5 to 6.9 16 to 60 A1156LUBTN-F-T 13-in. reel, 4000 pieces/reel 2-pin SIP through-hole High 5 to 6.9 16 to 60 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit 28 V Forward Supply Voltage VCC Reverse Supply Voltage VRCC –18 V B Unlimited G Magnetic Flux Density Operating Ambient Temperature TA –40 to 150 ºC Maximum Junction Temperature TJ(max) 165 ºC Tstg –65 to 170 ºC Rating Unit 2200 pF Storage Temperature Range L Internal Discrete Capacitor Ratings Characteristic Symbol Rated Normal Capacitance CSUPPLY Rated Voltage VCSUPPLY Notes Connected between VCC and GND 50 V Rated Capacitor Tolerance ±10 % Temperature Designator X8R – Pin-Out Diagram Terminal List Table Number 1 Name Function 1 VCC Input power supply 2 GND Ground terminal 2 UB Package Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F ELECTRICAL CHARACTERISTICS: Valid at TA = –40°C to 150°C, TJ < TJ(max), CBYP = 0.01 µF (excluding UB), through operating supply voltage range, unless otherwise noted Characteristics Supply Voltage1,2 Symbol VCC ICC(L) Supply Current ICC(H) Test Conditions Operating, TJ ≤ 165 °C A1152, A1155 B > BOP A1153, A1156 B < BRP A1152, A1155 B < BRP A1153, A1156 B > BOP Min. Typ. Max. Unit 3.0 – 24 V 5 – 6.9 mA 12 – 17 mA Supply Zener Clamp Voltage VZ(sup) ICC(L)(max) + 3 mA, TA = 25°C 28 – – V Supply Zener Clamp Current IZ(sup) VZ(sup) = 28 V – – ICC(L)(max) + 3 mA mA Reverse Supply Current IRCC VRCC = –18 V – – –1.6 mA di/dt Integrated bypass capacitor, capacitance of probe CS = 20 pF – 0.22 – mA / µs – 700 – kHz – – 25 µs – ICC(H) – – Output Slew Rate3 Chopping Frequency Power-Up Time4,5 Power-Up State2,4,6,7 fc ton POS A1152, A1155 B > BOP + 10 G A1153, A1156 B < BRP – 10 G ton < ton(max) , VCC slew rate > 25 mV / µs 1V CC 2 The represents the generated voltage between the VCC pin and the GND pin. VCC slew rate must exceed 600 mV/ms from 0 to 3 V. A slower slew rate through this range can affect device performance. 3 Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change. 4 Power-Up Time is measured without and with bypass capacitor of 0.01 µF. Adding a larger bypass capacitor would cause longer Power-Up Time. 5 Guaranteed by characterization and design. 6 Power-Up State as defined is true only with a V CC slew rate of 25 mV / µs or greater. 7 For t > t on and BRP < B < BOP , Power-Up State is not defined. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F MAGNETIC CHARACTERISTICS1: Valid at TA = –40°C to 150°C (TJ < TJ (max)), unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. Max. Unit2 Magnetic Characteristics Magnetic Operating Point Magnetic Release Point Hysteresis 1152, 1153 TA = –40°C 72 – 118 G TA = 25°C 58 – 100 G TA = 150°C 37 – 68 G 1155, 1156 TA = –40°C 23 – 73 G TA = 25°C 16 – 60 G TA = 150°C 9 – 49 G 1152, 1153 TA = –40°C 56 – 103 G TA = 25°C 46 – 85 G TA = 150°C 22 – 58 G 1155, 1156 TA = –40°C 6 – 53 G TA = 25°C 4 – 45 G TA = 150°C 4 – 39 G TA = –40°C 5 – 30 G TA = 25°C 5 – 30 G TA = 150°C 5 – 30 G BOP BRP BHYS 1152, 1153, 1155, 1156 1 Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present). 2 1 G (gauss) = 0.1 mT (millitesla). Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F THERMAL CHARACTERISTICS: may require derating at maximum conditions; see application information Characteristic Symbol Test Conditions* Value Unit Package Thermal Resistance RθJA Package UB, on 1-layer PCB with copper limited to solder pads 213 ºC/W *Additional thermal information available on the Allegro website UB Power Derating Curve UB Power Dissipation versus Ambient Temperature Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F Characteristic Performance A1152-F/A1153-F A1152/A1153/A1155/A1156 Average Supply Current (Low) versus Temperature A1155-F/A1156-F A1152/A1153/A1155/A1156 Average Supply Current (Low) versus Supply Voltage 7.0 Supply Current, ICC(L) (mA) Supply Current, ICC(L) (mA) 7.0 6.5 VCC = 24 V 6.0 VCC = 3.0 V 5.5 5.0 -60 -40 -20 0 20 40 60 80 100 120 140 6.5 TA = –40°C 6.0 TA = 25°C 5.5 5.0 160 TA = 150°C 2 6 A1152-F/A1153-F A1150/A1157/A1158 Average Supply Current (Low) versus Temperature 18 22 26 A1155-F/A1156-F A1150/A1157/A1158 5.0 Supply Current, ICC(L) (mA) Supply Current, ICC(L) (mA) 14 Average Supply Current (Low) versus Supply Voltage 5.0 4.5 4.0 VCC = 24 V 3.5 VCC = 3.0 V 3.0 2.5 2.0 -60 -40 -20 0 20 40 60 80 100 120 140 4.5 4.0 TA = –40°C 3.0 2.5 2.0 160 TA = 150°C TA = 25°C 3.5 2 6 Ambient Temperature, TA (°C) A1152-F/A1153-F A1150/A1152/A1153/A1155/A1156/A1157/A1158 14 18 22 26 A1155-F/A1156-F A1150/A1152/A1153/A1155/A1156/A1157/A1158 Average Supply Current (High) versus Supply Voltage 17 Supply Current, ICC(H) (mA) 17 16 VCC = 24 V 15 VCC = 3.0 V 14 13 12 -60 10 Supply Voltage, VCC (V) Average Supply Current (High) versus Temperature Supply Current, ICC(H) (mA) 10 Supply Voltage, VCC (V) Ambient Temperature, TA (°C) 16 -20 0 20 40 60 80 100 Ambient Temperature, TA (°C) 120 140 160 TA = 150°C TA = 25°C 14 13 12 -40 TA = –40°C 15 2 6 10 14 18 22 26 Supply Voltage, VCC (V) Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F A1155-F/A1156-F A1152-F/A1153-F Average Operate Point versus Temperature 120 80 105 65 Applied Flux Density at Operate Point, BOP (G) Applied Flux Density at Operate Point, BOP (G) Average Operate Point versus Temperature 90 75 VCC = 3.0 V 60 VCC = 24 V 45 VCC = 3.0 V VCC = 24 V 50 35 20 5 30 -60 -40 -20 0 20 40 60 -60 -40 -20 80 100 120 140 160 40 60 80 100 120 140 160 A1152-F/A1153-F A1155-F/A1156-F Average Release Point versus Temperature 60 95 VCC = 3.0 V 80 VCC = 24 V 65 50 35 Applied Flux Density at Release Point, BRP (G) 110 Applied Flux Density at Release Point, BRP (G) 20 Ambient Temperature, TA (°C) Average Release Point versus Temperature 50 VCC = 3.0 V 40 VCC = 24 V 30 20 10 0 20 -60 -40 -20 0 20 40 60 -60 -40 -20 80 100 120 140 160 0 20 40 60 80 100 120 140 160 Ambient Temperature, TA (°C) Ambient Temperature, TA (°C) A1152-F/A1153-F A1155-F/A1156-F Average Switchpoint Hysteresis versus Temperature Average Switchpoint Hysteresis versus Temperature 30 30 VCC = 3.0 V 25 VCC = 24 V 20 15 10 5 Applied Flux Density at Switchpoint Hysteresis, BHYS (G) Applied Flux Density at Switchpoint Hysteresis, BHYS (G) 0 Ambient Temperature, TA (°C) VCC = 3.0 V 25 VCC = 24 V 20 15 10 5 -60 -40 -20 0 20 40 60 80 100 120 140 160 Ambient Temperature, TA (°C) -60 -40 -20 0 20 40 60 80 100 120 140 160 Ambient Temperature, TA (°C) Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F Functional Description I+ B+ BHYS (A) Hysteresis curve for A1152 and A1155 0 ICC(L) B– BRP BOP BRP ICC(H) ICC ICC ICC(L) B– I+ Switch to Low 0 Switch to Low Switch to High ICC(H) The difference between the magnetic operate and release points is called the hysteresis of the device, BHYS . This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Switch to High In the case of the reverse output polarity, as in the A1153 and A1156, the device output switches high after the magnetic field at the Hall sensor IC exceeds the operate point threshold, BOP . When the magnetic field is reduced to below the release point threshold, BRP, the device output goes low (panel B). BOP The A1152 and A1155 output, ICC, switches low after the magnetic field at the Hall sensor IC exceeds the operate point threshold, BOP . When the magnetic field is reduced to below the release point threshold, BRP , the device output goes high. This is shown in Figure 1, panel A. B+ BHYS (B) Hysteresis curve for A1153 and A1156 Figure 1: Alternative Switching Behaviors Available in the A115x Device Family. On the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength (including the case of increasing north polarity). Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F V+ VCC RSENSE A115x V+ 0.1 µF VCC A115x 0.1 µF GND GND ECU RSENSE (A) Low side sensing (B) High side sensing Figure 2: Typical Application Circuits Chopper Stabilization Technique When using Hall-effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the offset that can be produced at the output of the Hall sensor IC. This makes it difficult to process the signal while maintaining an accurate, reliable output over the specified operating temperature and voltage ranges. Chopper stabilization is a unique approach used to minimize Hall offset on the chip. The patented Allegro technique, namely Dynamic Quadrature Offset Cancellation, removes key sources of the output drift induced by thermal and mechanical stresses. This offset reduction technique is based on a signal modulation-demodulation process. The undesired offset signal is separated from the magnetic fieldinduced signal in the frequency domain, through modulation. The subsequent demodulation acts as a modulation process for the offset, causing the magnetic field-induced signal to recover its original spectrum at base band, while the DC offset becomes a high-frequency signal. The magnetic-sourced signal then can pass through a low-pass filter, while the modulated DC offset is suppressed. The chopper stabilization technique uses a 350 kHz high frequency clock. For demodulation process, a sample and hold technique is used, where the sampling is performed at twice the chopper frequency. This high-frequency operation allows a greater sampling rate, which results in higher accuracy and faster signal-processing capability. This approach desensitizes the chip to the effects of thermal and mechanical stresses, and produces devices that have extremely stable quiescent Hall output voltages and precise recoverability after temperature cycling. This technique is made possible through the use of a BiCMOS process, which allows the use of low-offset, low-noise amplifiers in combination with high-density logic integration and sampleand-hold circuits. Regulator Hall Element Amp Sample and Hold Clock/Logic Low-Pass Filter Figure 3: Chopper Stabilization Circuit (Dynamic Quadrature Offset Cancellation) Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 10 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F 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 supplied power or improving the heat dissipation properties of the application. This section presents a procedure for correlating factors affecting operating TJ. (Thermal data is also available on the Allegro MicroSystems Web site.) The Package Thermal Resistance, RθJA, is a figure of merit summarizing 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, RθJC, is relatively small component of RθJA. Ambient air temperature, TA, and air motion are significant 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. Example: Reliability for VCC at TA = 150°C, package UA, using a low-K PCB. Observe the worst-case ratings for the device, specifically: RθJA = 213 °C/W, TJ(max) = 165°C, VCC(max) = 24 V, and ICC(max) = 17 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: ΔTmax = 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 ÷ 213 °C/W = 70.5 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(max) = 70.5 mW ÷ 17 mA = 4.15 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). PD = VIN × IIN (1) Compare V ΔT = PD × RθJA TJ = TA + ΔT (2) (3) CC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reliable 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. For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then: PD = VCC × ICC = 12 V × 4 mA = 48 mW ΔT = PD × RθJA = 48 mW × 140 °C/W = 7°C TJ = TA + ΔT = 25°C + 7°C = 32°C A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RθJA and TA. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 11 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F Package UB, 2-Pin SIP For Reference Only – Not for Tooling Use (Reference DWG-9070) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown +0.06 4.00 –0.05 B 4 X 10° 1.50 ±0.05 E 2.00 C 1.75 E 4.00 Mold Ejector Pin Indent +0.06 –0.07 E Branded Face A 4 X 2.50 REF 0.25 REF NNN YYWW LLLL 45° 0.85 ±0.07 0.42 ±0.10 D Standard Branding Reference View 0.30 REF 2.54 REF N Y W L 4 X 0.85 REF 1 = Supplier emblem = Last three digits of device part number = Last 2 digits of year of manufacture = Week of manufacture = Lot number 2 1.00 ±0.10 12.20 ±0.10 +0.07 0.25 –0.03 4 X 7.37 REF 1.80 ±0.10 A Dambar removal protrusion (8X) B Gate and tie bar burr area C Active Area Depth, 0.38 mm REF D Branding scale and appearance at supplier discretion E Hall element; not to scale F Thermoplastic Molded Lead Bar for alignment during shipment 0.38 REF 0.25 REF 4 X 0.85 REF 0.85 ±0.07 1.80 +0.06 –0.07 F 4.00 +0.06 –0.05 1.50 ±0.05 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 12 Chopper-Stabilized, Two-Wire Hall-Effect Switches A1152-F, A1153-F, A1155-F, and A1156-F Revision History Revision Revision Date – September 29, 2014 1 April 2, 2015 2 September 21, 2015 Description of Revision Initial Release Updated branding info on package drawing Added AEC-Q100 qualification under Features and Benefits Copyright ©2015, Allegro MicroSystems, LLC Allegro MicroSystems, LLC 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’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC 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, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 13