Data Sheet 27621.40 3150 PROGRAMMABLE, CHOPPERSTABILIZED, HALL-EFFECT SWITCH X The A3150JLT and A3150JUA programmable switches provide tooth/valley recognition in large gear-tooth sensing applications. Each device consists of a single element, chopper-stabilized Hall-effect IC that can be programmed to the desired magnetic switch point, optimizing device airgap and timing accuracy performance after final packaging. The small package can be easily assembled and used in conjunction with a wide variety of gear/target shapes and sizes. The two devices differ only in package style. PTCT T C . U Y D L N O n R O P E sig D C e E d N U E w N R e I E n T F r N E o f O R 0 C S OR 25 I D F A3 — se U 1 2 3 GROUND OUTPUT CC SUPPLY V Dwg. PH-003-2 PRELIMINARY INFORMATION (subject to change without notice) April 12, 1999 ABSOLUTE MAXIMUM RATINGS at TA = 25°C Supply Voltage, VCC ........................... 26.5 V Reverse Supply Voltage, VRCC ............ -30 V Overvoltage Supply Current, ICC ..... 100 mA Magnetic Flux Density, B ............ Unlimited Output Current, IOUT ..... Internally Limited Output OFF Voltage, VOUT ................. 26.5 V Reverse Output Current, IROUT ......... -50 mA Operating Temperature Range, TA ............................... -40°C to +115°C Storage Temperature, TS ................... +170°C The technology used for this deviceis Hall-effect based. The device incorporates a single-element Hall IC that switches in response to magnetic signals created by a ferrous target. The programmability of the circuit eliminates magnet and system offsets such as those caused by tilt yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions. A proprietary dynamic offset cancelation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Many problems normally associated with low-level analog signals are minimized by having the Hall element and amplifier in a single chip. Output precision is obtained by internal gain adjustments during the manufacturing process and operate-point programming in the user’s application. This system is ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. The A3150JLT/JUA are particularly suited to those applications that require accurate duty cycle control or accurate edge detection. The lower vibration sensitivity also makes these devices extremely useful for transmission speed sensing applications. Continued next page Always order by complete part number: the prefix 'A' + the basic four-digit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3150JLT . 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH FUNCTIONAL BLOCK DIAGRAM 1 SUPPLY REG. LOW-PASS FILTER OFFSET ADJUST SAMPLE & HOLD X DYNAMIC OFFSET CANCELLATION PROGRAM LOGIC POWER-UP OUTPUT 3 CONTROL CURRENT LIMIT <1Ω GROUND 2 Dwg. FH-020-3 Two package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting. FEATURES AND BENEFITS ■ Chopper Stabilized for Extremely Low Switch-Point Drift and Immunity to Mechanical Stress ■ Externally Programmed Switch Point ■ On-Chip Supply-Transient Protection ■ Output Short-Circuit Protection ■ Single-Chip IC for High Reliability ■ Small Mechanical Size ■ <50 µs Power-On Time ■ Wide Operating Voltage Range ■ Defined Power-On State 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, Allegro MicroSystems, Inc. 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage VCC Operating, TJ < 165°C 4.25 – 26 V Power-On State POS After programming, VCC = 0 → 5 V HIGH HIGH HIGH – Low Output Voltage VOUT(SAT) IOUT = 20 mA – 175 400 mV Output Current Limit IOUTM VOUT = 12 V 65 80 95 mA Output Leakage Current IOFF VOUT = 24 V – 0.2 10 µA Supply Current ICC Before programming, output OFF – 4.0 7.0 mA Before programming, output ON – 5.0 8.0 mA VRCC = -30 V – – -5.0 mA Reverse Supply Current IRCC Power-On Delay ton VCC > 5 V – 20 50 µs Output Rise Time tr RL = 820 Ω, CL = 20 pF – 200 – ns Output Fall Time tf RL = 820 Ω, CL = 20 pF – 100 – ns Clock Frequency fC – 340 – kHz Zener Voltage VZ IZT = 100 µA, TA = 25°C 27 32 – V Zener Impedance zz IZT = 10 mA, TA = 25°C – 50 100 Ω NOTE: Typical data is at VCC = 5 V and TA = +25°C and is for design information only. MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges. Limits Characteristic Symbol Operate Point BOP ∆BOP Hysteresis Test Conditions Min. Typ. Max. Units Programmable offset range 500 670 850 G Initial (before programming) 0 20 40 G Resolution 8.0 11 14 G VCC = 14 V, after programming, BOP ≈ 500 G -35 8.0 +35 G 5.0 20 35 G Bhys NOTE: Typical data is at VCC = 5 V and TA = +25°C and is for design information only. www.allegromicro.com 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH TYPICAL ELECTRICAL CHARACTERISTICS 5.0 10 T A = +25°C SUPPLY CURRENT IN mA V CC = 5 V B > B OP SUPPLY CURRENT IN mA 4.0 3.0 B < B RP 8.0 6.0 B > B OP 4.0 B < B RP 2.0 2.0 1.0 0 -50 -25 0 25 50 75 100 AMBIENT TEMPERATURE IN °C 125 150 Dwg. GH-053-2 0 5 10 15 20 25 SUPPLY VOLTAGE IN VOLTS Dwg. GH-041-2 300 I OUT = 20 mA SATURATION VOLTAGE IN mV V CC = 4.5–24 V 200 100 0 -50 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE IN °C Dwg. GH-040-4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH FUNCTIONAL DESCRIPTION Chopper-Stabilized Technique. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependencies, and thermal stress. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability. SAMPLE & HOLD REG X B +V The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. The chopperstabilizing technique cancels the mismatching of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measurement taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit. www.allegromicro.com www.allegromicro.com +V OUTPUT VOLTAGE VCC B RP B OP VOUT(SAT) 0 0 +B FLUX DENSITY Dwg. GH-007-2 SUPPLY 3 OUTPUT 2 1 CC 0.1 µF V The simplest form of magnet that will operate these devices is a bar magnet with the south-seeking pole towards the branded surface of the device. Many other methods of operation are possible. Extensive applications information on magnets and Hall-effect devices is also available in the Allegro Electronic Data Book AMS-702 or Application Note 27701, or + Dwg. AH-011-2 PTCT Applications. It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall element) between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique. HALL VOLTAGE X Operation. The output of these devices switches low (turns ON) when a magnetic field (south pole) perpendicular to the Hall element exceeds the operate point threshold (BOP). After turn-ON, the output is capable of sinking 25 mA and the output voltage is VOUT(SAT). When the magnetic field is reduced below the release point (BRP), the device output goes high (turns OFF). The difference in the magnetic operate and release points is the hysteresis (Bhys) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Dwg. EH-012 — SUPPLY Dwg. EH-013 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH PROGRAMMING PROTOCOL The A3150JLT and A3150JUA operate points are programmed by serially addressing the device through the supply terminal (pin1). After the correct operate point is determined, the device programming bits are selected and then a “lock” set to prevent any further (accidental) programming. Program Enable. To program the device, a sequence of pulses is used to activate/enable the addressing mode as shown in figure 1. This sequence of a VPP pulse, at least seven VPH pulses, and a VPP pulse with no supply interruptions, is designed to prevent the device from being programmed accidentally (for example, as a result of noise on the supply line). VPP PROGRAM ENABLE (AT LEAST 7 PULSES) VPH VPL td(1) td(1) td(0) 0 Figure 1 — Program enable Dwg. WH-013 PROGRAMMING PROTOCOL over operating temperature range. Limits Characteristic Programming Voltage Symbol Description Min. Typ. Max. Units Minimum voltage during programming 4.5 5.0 5.5 V VPH 9.0 10 11 V VPP 20 23 25 V VPL Programming Current IPP Max. supply current during programming – 250 – mA Pulse Width td(0) OFF time between bits 20 – – µs td(1) Enable, address, program, or lock bit ON time 20 – – µs tdP Program pulse ON time 100 300 – µs Pulse Rise Time tr VPL to VPH or VPP 11 – – µs Pulse Fall Time tf VPH or VPP to VPL 5.0 – – µs NOTE: Typical data is at TA = +25°C and is for design information only. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ADDRESS N (UP TO 63) ADDRESS N-1 ADDRESS N-2 ADDRESS 2 ADDRESS 0 Address Determination. The operate point is adjustable in 64 increments. With the appropriate target or gear* in position, the 64 switch points are sequentially selected (figure 2) until the required operate point is reached. Note that the difference between the operate point and the release point (hysteresis) is a constant for all addresses. ADDRESS 1 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH VPH VPL td(1) td(0) 0 Dwg. WH-014 Set-Point Programming. After the desired set-point address is determined (0 through 63), each bit of the equivalent binary address is programmed individually. For example, as illustrated in figure 3, to program address code 5 (binary 000101), bits 1 and 3 need to be programmed. Each bit is programmed during the wide VPP pulse and is not reversible. Figure 2 — Address determination VPP PROGRAM ENABLE BIT 3 PROGRAM (000100) ADDRESS 4 BIT 1 PROGRA Lock Programming. After the desired set point is programmed, the program lock is then activated (figure 4) to prevent further programming of the device. PROGRAM ENABLE VPH VPL td(1) td(1) td(0) tdP 0 Dwg. WH-015 Figure 3 — Set-point programming VPP PROGRAM ENABLE LOCK PROGRAM (65 PULSES) VPH VPL td(1) td(1) td(0) tdP 0 Dwg. WH-016 Figure 4 — Lock programming * In application, the terms “gear” and “target” are often interchanged. However, “gear” is preferred when motion is transferred. www.allegromicro.com 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH CRITERIA FOR DEVICE QUALIFICATION All Allegro products are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted. Qualification Test Test Method and Test Conditions Test Length Samples Biased Humidity (HAST) T A = 130°C, RH = 85% 50 hrs 77 V CC = VOUT = 5 V High-Temperature Operating Life (HTOL) JESD22-A108, T A = 150°C, TJ = 165°C 408 hrs 77 VCC = 24 V, VOUT = 20 V Accelerated HTOL JESD22-A108, TA = 175°C, TJ = 190°C 504 hrs 77 VCC = 24 V, VOUT = 20 V Autoclave, Unbiased JESD22-A102, Condition C, TA = 121°C, 15 psig 96 hrs 77 High-Temperature (Bake) Storage Life MIL-STD-883, Method 1008, T A = 170°C 1000 hrs 77 Temperature Cycle MIL-STD-883, Method 1010, -65°C to +150°C 500 cycles 77 Latch-Up — Pre/Post Reading 6 Electro-Thermally Induced Gate Leakage — Pre/Post Reading 6 ESD, Human Body Model CDF-AEC-Q100-002 Pre/Post Reading x per test Electrical Distributions Per Specification — 30 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Comments Test to failure, All leads > TBD 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH ELEMENT LOCATIONS (±0.005” [0.13 mm] die placement) Package Designator “LT” ACTIVE AREA DEPTH 0.030" 0.76 mm NOM 0.088" 2.24 mm 0.045" 1.14 mm A 1 2 3 Dwg. MH-008-8 Package Designators “UA” and "UA-TL" ACTIVE AREA DEPTH 0.018" 0.46 mm NOM 0.080" 2.04 mm 0.056" 1.44 mm A BRANDED SURFACE 1 2 3 Dwg. MH-011-9A Although element location is accurate to three sigma for a particular design, product improvements may result in small changes to element location. Allegro www.allegromicro.com 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH PACKAGE DESIGNATOR 'LT' (SOT-89/TO-243AA) Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.167 0.155 2 1 Dimensions in Millimeters (controlling dimensions) 0.063 0.055 3 0.102 0.090 0.0173 0.0138 0.090 0.084 4.25 3.94 0.0189 0.0142 0.0221 0.0173 0.047 0.035 0.059 BSC 4.60 4.40 1.83 1.62 BSC 3.00 BSC Dwg. MA-009-3A in Dwg. MA-009-3A mm 2.5 2.0 B 0.031 A 0.102 0.8 2.6 A 4.6 0.181 1 2 2.29 2.13 0.56 0.44 1.50 0.098 0.079 B 2.60 2.29 3 0.44 0.35 0.48 0.36 1.20 0.89 0.118 BSC 2 1 1.60 1.40 3 0.047 1 2 3 1.2 0.028 0.031 0.7 0.8 TYP TYP TYP TYP ads 1, 2, 3, and A — Standard SOT-89 Layout ads 1, 2, 3, and B — Low-Stress Version ads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning Pads 1, 2, 3, and A — Standard SOT-89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning Dwg. MA-012-3 in Dwg. MA-012-3 mm NOTE: Exact body and lead configuration at vendor’s option within limits shown. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH PACKAGE DESIGNATOR 'UA' Dimensions in Millimeters (for reference only) Dimensions in Inches (controlling dimensions) 4.17 4.04 0.164 0.159 0.062 0.058 45° 1.57 1.47 45° 3.10 2.97 0.122 0.117 45° 45° 0.085 1 2 3 0.031 2.16 1 2 3 0.79 MAX MAX 0.640 0.600 16.26 15.24 0.0173 0.0138 0.0189 0.0142 SEE NOTE 0.44 0.35 0.48 0.36 SEE NOTE 1.27 0.050 BSC BSC Dwg. MH-014E in Dwg. MH-014E mm Surface-Mount Lead Form (Suffix '-TL') 2.41 0.095 ±0.13 ±0.005 0.002 0.051 MAX MAX 0.004 0°–8° MAX 0.10 0.020 MIN FLAT MAX Dwg. MH-015 in 0°–8° 0.51 MIN FLAT Dwg. MH-015 mm NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035” (0.89 mm). 5. Where no tolerance is specified, dimension is nominal. www.allegromicro.com 3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH 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 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000