A1181 ALLEGRO | Alldatasheet
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A1180 – A1184 Preliminary Data Sheet PRELIMINARY DATA SHEET SUBJECT TO CHANGE WITHOUT NOTICE Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch See typical application drawing for UA pinning. The A118X is a two -wire, unipolar, Hall -effect switch family designed for use in high -temperature applications. This device uses a patented high frequency chopper -stabilization technique on Allegro's new DABIC5 BiCMOS wafer fabrication process to achieve magnetic stability and to eliminate offset inherent in single -element devic es and from harsh - application environments. The A118X FAMILY of devices incorporates a programmability function to allow for external trimming of the operate point. The programming is performed after final packaging of the sensor and placement of the Sin gle In -Line Package (SIP) into the application. This advanced feature allows for optimization of sensor switching performance by effectively accounting for variations caused by magnet and SIP placement tolerances. These devices provide on -chip transient protection. A zener clamp on the power supply protects against over -voltage conditions on the supply line. The output of the A118X FAMILY, with the exception of the A1180/2, will switch HIGH in the presence of a sufficiently large south -pole magnetic field and will switch LOW with the removal of the field. The A1180/2 has the opposite polarity as the others, switching LOW in the presence of a sufficient magnetic field and HIGH with the removal of the field. Two package styles provide a magnetically opt imized package for most applications. Suffix “LH” is a miniature low profile package for surface-mount applications; suffix “UA” is a three -lead ultra -mini Single Inline Package (SIP) for through-hole mounting. Factory programmed versions also available , see A1140/42/43/45. Programming software and/or hardware demonstration kits also available see ASEK-01 on the Allegro web site, www.allegromicro.com. ABSOLUTE MAXIMUM RATINGS Supply Voltage Reverse-Battery Voltage Magnetic Flux Density Package Power Dissipation θ ja, Junction Temperature, TJ ……………….. +170°C Operating Temperature Range, TA Storage Temperature Range FEATURES / BENEFITS ♦ Chopper Stabilization s Extremely low switch-point drift s Low stress sensitivity ♦ One-time external programmability s Operate Point ♦ On-chip Protection s Supply transient protection s Robust ESD/EMC protection s Reverse-battery protection ♦ On-board Voltage Regulator s 3.8 V to 24 V operation Order by complete part number (i.e. A1182LUA). 1 The “LH” PPD is based on a 0.062" thick FR4, single-sided board using 2 oz. copper, with a 0.55 mm2 area of copper attached to the ground lead.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. CHARACTERISTICS Valid over operating temperature range unless otherwise noted. Limits Part Number Characteristics Symbol Test Conditions Min. Typ. Max. Units
ELECTRICAL CHARACTERISTICS
A118X FAMILY Supply Voltage VCC Operating 3.8 - 24 V IGND(L) Output I Low 5 - 6.9 mA A1182/3/4 Supply Current IGND(H) Output I High 12 - 17 mA IGND(L) Output I Low 2 - 5 mA A1180/12 Supply Current IGND(H) Output I High 12 - 17 mA Output Rise Time 3 tr RL=100 Ohms, CBYP=0.1uF - 20 - us Output Fall Time 3 tf RL=100 Ohms, CBYP=0.1uF - 20 - us Chopping Frequency fC - - 340 - kHz Power-Up Time ton - - - 25 µs Power-Up State POS t < ton, tr < 5us, no bypass capacitor - HIGH - - A118X Zener Voltage VZ I = 10mA 28 36 40 V MAGNETIC CHARACTERISTICS Minimum Programmable Operate Point BOPmin 60 G Maximum Programmable Operate Point BOPmax B>Bop, IGND=Low (A1180/2) IGND=High (A1181/3) 200 G A1180/1/2/3 4 Switch Point Step Size BRES - 8 G Minimum Programmable Operate Point BOPmin 300 G Maximum Programmable Operate Point BOPmax B>Bop, IGND=High (A1184) 600 G A11845 Switch Point Step Size BRES - 16 G Switch Point - 5 - Bit(s) Number of Programming Bits - Programming Lock - 1 - Bit(s) Temperature Drift of B OP Δ BOP A1180-A1183 +/-20 G A118X Hysterisis BHYS BOP - BRP 5 15 30 G 2 These are the A3161 current levels. 3 Typical rise and fall time of the Hall sensor is 1us, the true rise and fall time is dependent on the load circuit as indicated by the 20us specification. 4 Programming is typically performed at Ta = 25°C and does not take into account temperature drift of the switch point. See Δ BOP. 5 Programming is typically performed at Ta = 25°C and does not take into account temperature drift of the switch point. Δ BOP has not yet been characterized for the A1184 and may require additional tolerance due to the high magnetic switch points.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 3 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. FUNCTIONAL BLOCK DIAGRAM Reg Clock/Logi c AMP S/H LPF Supply GND Programmmin g Logic Program / Lock Offset Adjust To all subcircuits Optional GND ("UA" ONLY-Pin 3)
0 Output Current
0 Flux Density +B
A1181/3/4 Hysteresis Curve
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 4 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. Typical Characterization Data All data is the average of 1 Lot, >1000 Units Bop 85G trim -40 C 25 C 85 C Temperature (C) Switch point (G) Vcc=24v Vcc= 12v Vcc= 3.8v Bop programming values 100 120 140 160 180 0 1 2 3 4 5 Significant Bit Switch point (G) Iccon 12.5 13.5 14.5 15.5 16.5 -40 C 25 C 85 C Temperature (C) Current (mA) Vcc= 24v Vcc= 12v Vcc= 3.8v Iccoff 5.2 5.4 5.6 5.8 6.2 6.4 6.6 6.8 -40 C 25 C 85 C Temperature (C) Current (mA) Vcc =24v Vcc =12v Vcc =3.8v
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 5 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. Functional Description Chopper-Stabilization Technique. A limiting factor for switch point accuracy when using Ha ll effect technology is the small signal voltage developed across the Hall plate. This voltage is proportionally small relative to the offset that can be produced at the output of the Hall sensor. This makes it difficult to process the signal and maintai n an accurate, reliable output over the specified temperature and voltage range. Chopper Stabilization is a unique approach used to minimize Hall offset on the chip. The Allegro patented technique; dynamic quadrature offset cancellation, removes key sour ces of the output drift induced by temperature and package stress. This offset reduction technique is based on a signal modulation -demodulation process. The undesired offset signal is separated from the magnetically induced signal in the frequency domain through modulation. The subsequent demodulation acts as a modulation process for the offset causing the magnetically induced signal to recover its original spectrum at base band while the dc offset becomes a high frequency signal. Then, using a low -pass filter the signal passes while the modulated dc offset is suppressed. The chopper stabilization technique uses a 170 kHz high frequency clock. The Hall plate chopping occurs on each clock edge resulting in a 340 kHz chop frequency. The high frequency op eration allows for a greater sampling, which produces higher accuracy and faster signal processing capability. Using this chopper stabilization approach, the chip is de - sensitized to the effects of temperature and stress. This technique produces devices that have an extremely stable quiescent Hall output voltage, is immune to thermal stress, and has precise recoverability after temperature cycling. This technique is made possible through the use of a BiCMOS process which allows the use of low offset and low noise amplifiers in combination with high -density logic integration and sample and hold circuits. The repeatability of switching with a magnetic field is slightly affected using a chopper technique. Allegro’s high frequency chopping approach minimi zes the affect of jitter and makes it imperceptible in most applications. Applications that may notice the degradation are those that require the precise sensing of alternating magnetic fields such as ring magnet speed sensing. For those applications, Al legro recommends the “low jitter” family of digital sensors. Regulator Amplifier Sample/ Hold CLOCK Hall Element Concept of Dynamic Quadrature Offset Cancellation
Copyright © 1993, 1995 Allegro MicroSystems, Inc. prevent any further programming. Figure 1. Program Enable Pulse Sequence. Valid over operating temperature range unless otherwise noted. provide the current necessary to blow the fuse.
Copyright © 1993, 1995 Allegro MicroSystems, Inc. magnetic release point (Brp), the Hysteresis (Hys), is fixed for all addresses. Figure 2. Sequential selected addresses. Figure 3. Bit programming. prevent further programming of the device. Figure 4. Lock -bit programming programming products. Programming hardware is available for purchase and programming software is available for free.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 8 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. TYPICAL APPLICATION CIRCUIT Applications. It is necessary that an external bypass capacitor be connected between the supply and ground of the device to reduce both external noise and noise generated by the chopper -stabilization technique and ensure sufficient energy to guarantee proper programming. (A 0.1uF cap is recommended for proper fuse blowing and may reside o n the programming board) The bypass capacitor in the application should be no further than 5 mm away from the Hall sensor. The bypass capacitor is to protect the Hall IC only. All high frequency interferences conducted along the supply lines will be passed directly to the load through the bypass capacitor. Therefore, the ECU must have sufficient protection other than the bypass capacitor placed in parallel with the Hall IC. A series resistor on the supply side, Rs (not shown), in combination with the bypass capacitor will create a filter for EMC pulses. The series resistor (Rs) and/or sense resistor (Rsense) will have voltage drops across them that must be considered for the minimum Vcc requirement of the device. The preferred sense resistor value is approximately 100 ohms. All programming, code and lock -bit programming, should be done directly across the part, between V CC and Output with the use of a 0.1uF bypass capacitor. Programming across the series resistor or sense resistor may not allow enough energy to properly blow the fuses. The result would be incorrect switch points . Typical Application (UA Pkg): Extensive applications information on magnets and Hall -effect sensors including Chopper -Stabilization is available in the Allegro Electronic Data Book CD, or at the website: http://www.allegromicro.com V Supply Vcc Optional OUTPUT UA ONLY OUTPUT 0.01uF A118X 2 R SENSE ECU
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 9 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. DEVICE QUALIFICATION PROGRAM Test Name Test Conditions Test Length # of Lots Sample / lot Comments Pre/Post Test Ta = room, hot, cold High Temperature Operating Life (HTOL) Ta = 150°C, Tj ? 170°C 408 hrs 1 77 JESD22-A108 High Temperature Bake (HTB) Ta = 170°C 1000 hrs 1 77 JESD22-A103 Pre Conditioning (PC) 85°C/85%RH 168 hrs 1 231 JESD22-A112 & A113 Temperature Humidity Bias (THB) or HAST 85°C/85%RH 130°C/85%RH 1000 hrs 50 hrs 1 77 JESD22-A101 JESD22-A110 Autoclave (AC) 121°C/15 psig 96 hrs 1 77 JESD22-A102 Temperature Cycle (TC) -65°C to +150°C or -50°C to +150°C 500 cycles 1000 cycles 1 77 JESD22-A104 External Visual (EV) Physical Dimensions (PD) 1 30 Lead Integrity 1 45 Bond Pull Strength 1 30 ESD HBM & MM 1 3 per model per V step JESD22-A114 & A115,CDF- AEC-Q100-002, 003 & 011 Solderability (SD) 1 15 JESD22-B102 Early Life Failure Rate (ELFR) 125°C or 150°C 48 hrs 24 hrs 1 800 JESD22-A108 Gate Leakage (GL) 1 6 CDF- AEC-Q100-006 Electrical Distributions (ED) Ta = room, hot, cold 3 30 EMC Requirements (Electromagnetic Compatibility) Please contact your local representative for EMC results Test Name Reference Specification 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
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 10 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. POWER DE-RATING Due to internal power consumption, the junction temperature of the IC, Tj, is higher than the ambient environment temperature, Ta. To ensure that the device does not operate above the maximum rated junction temperature use the following calculations: Δ T = PD * Rθ ja Where: PD = Vcc * Icc ∴ Δ T=Vcc * Icc * Rθ ja Where Δ T denotes the temperature rise resulting from the IC’s power dissipation. Tj = Ta + Δ T For the sensor : Tj(max) = 170°C Rθ ja (UA Pkg) = 206°C/W Typical Tj calculation: Ta = 25 °C Vcc = 12 V Icc = Icc ONtyp = 14.5 mA PD = Vcc * Icc = 12 V * 14.5 mA = 174 mW Δ T = PD * Rθ ja = 174 mW * 206°C/W = 35.8 °C Tj = Ta + Δ T = 25 °C + 35.8 °C = 60.8 °C Maximum Allowable Power Dissipation Calculation for A118X Family7: Assume: Ta = Tamax = 150 °C Tj(max) = 170°C Icc = IONmax = 17 mA If: Tj = Ta + Δ T Then: Δ Tmax = Tjmax – Tamax = 170 °C - 150 °C = 20 °C If: Δ T = PD * Rθ ja Then: PDmax = Δ Tmax / Rθ ja = 20 °C / 206 °C/W = 97.1 mW If: PD = Vcc * Icc Then the maximum Vcc a t 150°C is therefore: Vccmax = P Dmax / Icc = 97.1 mW / 17 mA = 5.7 V Maximum Supply Voltage vs Ambient Temperature 0 25 50 75 100 125 150 Temperature (°C) Maximum Supply Voltage (V) UA (ROJA = 206°C/W) LH (ROJA = 228°C/W) 7 The “LH” PPD is based on a 0.062" thick FR4, single-sided board using 2 oz. copper, with a 0.55 mm2 area of copper attached to the ground lead.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 11 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 12 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 13 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc.
TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY (PRELIMINARY INFORMATION – SUBJECT TO CHANGE) Rev. 1.8 25 April 2003 Page 14 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 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; 5,686,894; 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 appliances, 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 infringements of patents or other rights of third parties that may result from its use.