A1384

A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Features and Benefits ▪ Customer programmable offset, sensitivity, sensitivity temperature coefficient, and polarity ▪ Programmability at end-of-line ▪ Ratiometric sensitivity, quiescent voltage output, and clamps for interfacing with application DAC ▪ Temperature-stable quiescent voltage output and sensitivity ▪ Precise recoverability after temperature cycling ▪ Output voltage clamps provide short circuit diagnostic capabilities ▪ Wide ambient temperature range: –40°C to 150°C ▪ Immune to mechanical stress ▪ Miniature package options Description New applications for linear output Hall effect sensors, such as displacement, angular position, and current measurement, require high accuracy in conjunction with small package size. The Allegro® A138x family of programmable linear Hall effect sensors was designed specifically to achieve both goals. These temperature-stable devices are available in a miniature surface mount package (SOT23-W) and an ultramini throughhole single-in-line package. The accuracy of these devices is enhanced via programmability on the output pin for end-of-line optimization without the added complexity and cost of a fully programmable device. These ratiometric Hall effect sensors provide a voltage output that is proportional to the applied magnetic field. Both the quiescent voltage output and magnetic sensitivity are useradjustable. The quiescent voltage output can be set around 50% of the supply voltage, and the sensitivity adjusted between 2 mV/G and 9 mV/G over the device family. Programming selections also exist for output polarity and temperature compensation. The features of this linear family make it ideal for high accuracy requirements of automotive and industrial applications, and performance is guaranteed over an extended temperature range, –40°C to 150°C. Continued on the next page… Packages 3 pin surface mount SOT23-W (suffix LH) 3 pin ultramini SIP (suffix UA) Not to scale Functional Block Diagram V+ VCC To all subcircuits Dynamic Offset Cancellation Amp Filter Out VOUT (Programming) CBYPASS Hall Drive Circuit Gain Temperature Coefficient Trim Control GND Gain Offset A1381-DS, Rev. 1 A1381, A1382, A1383, and A1384 Description (continued) Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Each BiCMOS monolithic circuit integrates a Hall element, temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, a clamped low-impedance output stage, and a proprietary dynamic Selection Guide Part Number Packing* Package Surface mount Through hole Surface mount Through hole Surface mount Through hole Surface mount Through hole Surface mount Through hole Surface mount Through hole Surface mount Through hole Surface mount Through hole offset cancellation technique. The A138x sensors are provided in a 3 pin ultramini single-in-line package (UA suffix), and a 3 pin surface mount SOT-23W package (LH suffix). TA (°C) –40 to 85 Internal Bandwidth (kHz) Sensitivity Range (mV/G) A1381ELHLT-T Tape and reel, 3000 pieces/reel A1381EUA-T Bulk bag, 500 pieces/bag A1381EUATI-T Tape and reel, 2000 pieces/reel A1381LLHLT-T Tape and reel, 3000 pieces/reel A1381LUA-T Bulk bag, 500 pieces/bag A1381LUATI-T Tape and reel, 2000 pieces/reel A1382ELHLT-T Tape and reel, 3000 pieces/reel A1382EUA-T Bulk bag, 500 pieces/bag A1382EUATI-T Tape and reel, 2000 pieces/reel A1382LLHLT-T Tape and reel, 3000 pieces/reel A1382LUA-T Bulk bag, 500 pieces/bag A1382LUATI-T Tape and reel, 2000 pieces/reel A1383ELHLT-T Tape and reel, 3000 pieces/reel A1383EUA-T Bulk bag, 500 pieces/bag A1383EUATI-T Tape and reel, 2000 pieces/reel A1383LLHLT-T Tape and reel, 3000 pieces/reel A1383LUA-T Bulk bag, 500 pieces/bag A1383LUATI-T Tape and reel, 2000 pieces/reel A1384ELHLT-T Tape and reel, 3000 pieces/reel A1384EUA-T Bulk bag, 500 pieces/bag A1384EUATI-T Tape and reel, 2000 pieces/reel A1384LLHLT-T Tape and reel, 3000 pieces/reel A1384LUA-T Bulk bag, 500 pieces/bag A1384LUATI-T Tape and reel, 2000 pieces/reel *Contact Allegro for additional packing options. 12 –40 to 150 6.00 to 9.00 –40 to 85 17 –40 to 150 4.00 to 6.25 –40 to 85 21 –40 to 150 2.75 to 4.25 –40 to 85 27 –40 to 150 2.00 to 3.00 Absolute Maximum Ratings Characteristic Forward Supply Voltage Reverse Supply Voltage Forward Output Voltage Reverse Output Voltage Output Source Current Output Sink Current Operating Ambient Temperature Storage Temperature Maximum Junction Temperature Symbol VCC VRCC VOUT VROUT IOUT(SOURCE) IOUT(SINK) TA Tstg TJ(max) Number LH 1 3 1 2 1 2 3 Notes VOUT to GND VCC to VOUT Range E Range L Rating 8 –0.1 28 –0.1 2 10 –40 to 85 –40 to 150 –65 to 165 165 Units V V V V mA mA ºC ºC ºC ºC Pin-out Diagrams LH Package 3 UA Package UA 1 2 3 Name VCC GND VOUT Description Input power supply; use bypass capacitor to connect to ground Ground Output signal; also used for programming 2 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package OPERATING CHARACTERISTICS, valid over full operating temperature range, TA; CBYPASS= 0.1 μF, VCC = 5 V, unless otherwise specified Characteristic ELECTRICAL CHARACTERISTICS Supply Voltage Supply Current VCC ICC No load on VOUT A1381 A1382 Power-On Time1 tPO A1383 A1384 Delay to Clamp1 Supply Zener Clamp Voltage tCLP VZ TA = 25 °C, CBYPASS = open, CL (of test probe) = 10 pF, Sens = 7.5 mV/G TA = 25 °C, CBYPASS = open, CL (of test probe) = 10 pF, Sens = 5.0 mV/G TA = 25 °C, CBYPASS = open, CL (of test probe) = 10 pF, Sens = 3.125 mV/G TA = 25 °C, CBYPASS = open, CL (of test probe) = 10 pF, Sens = 2.5 mV/G 4.5 – – – – – – 6 – Small signal –3 dB – – – – TA=25°C; CL = 10 nF, Sens = 7.5 mV/G; no external filter TA=25°C; CL = 10 nF, Sens = 5.0 mV/G; no external filter TA=25°C; CL = 10 nF, Sens = 3.125 mV/G; no external filter TA=25°C; CL = 10 nF, Sens = 2.5 mV/G; no external filter TA=25°C; Sens = 2.5 mV/G; external 2 kHz low pass filter with R = 1.69 kΩ, C = 47 nF 5.0 6.9 32 27 23 19 30 8.3 12 17 21 27 170 5.5 8 – – – – – – – – – – – V mA μs μs μs μs μs V kHz kHz kHz kHz kHz Symbol Test Conditions Min. Typ. Max. Units TA = 25°C, CL = 10 nF TA = 25°C, ICC = 11 mA A1381 A1382 A1383 A1384 TA = 25°C Internal Bandwidth BWi Chopping Frequency2 fC OUTPUT CHARACTERISTICS A1381 A1382 Noise (peak to peak) VN(p-p) A1383 A1384 A138x DC Output Resistance Output Load Resistance Output Load Capacitance Phase Shift3 ROUT RL CL ∆Φ VCLP(HIGH) Output Voltage Clamp4 VCLP(LOW) Output Slew Rate SR VOUT to VCC VOUT to GND VOUT to GND No load on VOUT, magnetic input signal frequency = 1 kHz, with 1 V(p-p) output signal TA = 25°C, B = 600 G, Sens = 5.0 mV/G, RL = 10 kΩ (VOUT to GND) TA = 25°C, B = –600 G, Sens = 5.0 mV/G, RL = 10 kΩ (VCC to VOUT) CL = 10 nF – – – – – – 4.7 4.7 – – 4.35 0.40 – 34 27 20 18 4.7 |BPOS1| and |BNEG2| > |BNEG1|. Then: LinERR = max( |LinERRPOS | , |LinERRNEG | ) ⎛ Sens(VCC) / Sens(5V) ⎞ ⎟ × 100% RatERRSens = ⎜1– ⎜ ⎟ VCC / 5 V ⎝ ⎠ . (14) The ratiometric error in the clamp voltages, RatERRCLP (%), for a given supply voltage, VCC, is defined as: . (11) Symmetry Sensitivity Error The magnetic sensitivity of an A138x device is constant for any two applied magnetic fields of equal magnitude and opposite polarities. ⎛ VCLP(VCC) / VCLP(5V) ⎞ ⎟ × 100% RatERRCLP = ⎜1– ⎜ ⎟ VCC / 5 V ⎝ ⎠ where VCLP is either VCLP(HIGH) or VCLP(LOW). . (15) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 9 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Typical Application Drawing V+ VCC VOUT CBYPASS GND CL 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. 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 field-induced 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 170 kHz high frequency clock. For the demodulation process, a sample and hold technique is used, where the sampling is performed at twice the chopper frequency (340 kHz). This high-frequency operation allows a greater sampling rate, which results in higher accuracy and faster signalprocessing 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 sample-and-hold circuits. Regulator Clock/Logic Hall Element Sample and Hold Low-Pass Filter Amp Concept of Chopper Stabilization Technique Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 10 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Programming Guidelines Definition of Terms Register. The section of the programming logic that controls the choice of programmable modes and parameters. Bit Field. The internal fuses unique to each register, represented as a binary number. Incrementing the bit field of a particular register causes its programmable parameter to change, based on the internal programming logic. Key. A series of VPM voltage pulses used to select a register, with a value expressed as the decimal equivalent of the binary value. The LSB of a register is denoted as key 1, or bit 0. Code. The number used to identify the combination of fuses activated in a bit field, expressed as the decimal equivalent of the binary value. The LSB of a bit field is denoted as code 1, or bit 0. Addressing. Incrementing the bit field code of a selected register by serially applying a pulse train through the VOUT pin of the device. Each parameter can be measured during the addressing process, but the internal fuses must be blown before the programming code (and parameter value) becomes permanent. Fuse Blowing. Applying a VPH voltage pulse of sufficient duration at the VP(HIGH) level to permanently set an addressed bit by blowing a fuse internal to the device. Once a bit (fuse) has been blown, it cannot be reset. Blow Pulse. A VPH voltage pulse of sufficient duration at the VP(HIGH) level to blow the addressed fuse. Cycling the Supply. Powering-down, and then powering-up the supply voltage. Cycling the supply is used to clear the programming settings in Try mode. Overview Programming is accomplished by sending a series of input voltage pulses serially through the VOUT pin of the device. A unique combination of different voltage level pulses controls the internal programming logic of the device to select a desired programmable parameter and change its value. There are two programming pulses, referred to as a high voltage pulse, VPH, consisting of a VP(LOW) –VP(HIGH) –VP(LOW) sequence and a mid voltage pulse, VPM, consisting of a VP(LOW) –VP(MID) –VP(LOW) sequence. The 138x features Try mode, Blow mode, and Lock mode: • In Try mode, the value of a single programmable parameter may be set and measured. The parameter value is stored temporarily, and resets after cycling the supply voltage. Note that other parameters cannot be accessed simultaneously in this mode. • In Blow mode, the value of a single programmable parameter may be permanently set by blowing solid-state fuses internal to the device. Additional parameters may be blown sequentially. • In Lock mode, a device-level fuse is blown, blocking the further programming of all parameters. The programming sequence is designed to help prevent the device from being programmed accidentally; for example, as a result of noise on the supply line. Although any programmable variable power supply can be used to generate the pulse waveforms, Allegro highly recommends using the Allegro Sensor Evaluation Kit, available on the Allegro Web site On-line Store. The manual for that kit is available for download free of charge, and provides additional information on programming these devices. Programming Pulse Requirements, Protocol at TA = 25°C Characteristic Programming Voltage Symbol VP(LOW) VP(MID) VP(HIGH) Measured at the VOUT pin. Notes Min. Typ. Max. Units 14 26 15 27 5.5 16 28 100 100 V V V mA μs μs μs μs μs μs μs Programming Current IP tOFF(HIGH) tOFF(MID) Minimum supply current required to ensure proper fuse blowing. In addition, a minimum capacitance, CBLOW = 0.1 μF, must be connected between the VOUT and GND pins during programming to provide the current necessary for fuse blowing. Duration at VP(LOW) level following a VP(HIGH) level. Duration at VP(LOW) level following a VP(MID) level. Duration of VP(HIGH) level for VPH pulses during key/code selection. Duration of VP(MID) level for VPH pulses during key/code selection. Duration at VP(HIGH) level for fuse blowing. Rise time required for transitions from VP(LOW) to either VP(MID) or VP(HIGH). Fall time required for transitions from VP(HIGH) to either VP(MID) to VP(LOW). 300 30 5 30 15 30 1 1 Pulse Width tACTIVE(HIGH) tACTIVE(MID) tBLOW Pulse Rise Time Pulse Fall Time tPr tPf Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 11 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Programming Procedures Parameter Selection Each programmable parameter can be accessed through a specific register. To select a register, a sequence of voltage pulses consisting of a VPH pulse, a series of VPM pulses, and a VPH pulse (with no VCC supply interruptions) must be applied serially to the VOUT pin. The number of VPM pulses is called the key, and uniquely identifies each register. The pulse train used for selection of the first register, key 1, is shown in figure 1. V+ VP(HIGH) The A138x has three registers that select among the five programmable parameters: • Register 1: Quiescent voltage output, VOUT(Q) • Register 2: Sensitivity, Sens • Register 3: Sensitivity temperature coefficient, TCSens Polarity, POL Overall device locking, LOCK Bit Field Addressing After a programmable parameter has been selected, a VPH pulse transitions the programming logic into the bit field addressing state. Applying a series of VPM pulses to the VOUT pin of the device, as shown in figure 2, increments the bit field of the selected parameter. tACTIVE VP(MID) VP(LOW) tLOW 0 Figure 1. Parameter selection pulse train. This shows the sequence for selecting the register corresponding to key 1, indicated by a single VPM pulse. When addressing the bit field, the number of VPM pulses is represented by a decimal number called a code. Addressing activates the corresponding fuse locations in the given bit field by incrementing the binary value of an internal DAC. The value of the bit field (and code) increments by one with the falling edge of each VPM pulse, up to the maximum possible code (see the Programming Logic table). As the value of the bit field code increases, the value of the programmable parameter changes. Measurements can be taken after each pulse to determine if the desired result for the programmable parameter has been reached. Cycling the supply voltage resets all the locations in the bit field that have unblown fuses to their initial states. Code 2n – 2 Code 1 VP(MID) Code 2 VP(HIGH) Code 2n – 1 V+ Fuse Blowing VP(LOW) 0 Figure 2. Bit field addressing pulse train. Addressing the bit field by incrementing the code causes the programmable parameter value to change. The number of bits available for a given programming code, n, varies among parameters; for example, the bit field for VOUT(Q) has 6 bits available, which allows 63 separate codes to be used. After the required code is found for a given parameter, its value can be set permanently by blowing individual fuses in the appropriate register bit field. Blowing is accomplished by applying a VPH pulse, called a blow pulse, of sufficient duration at the VP(HIGH) level to permanently set an addressed bit by blowing a fuse internal to the device. Due to power requirements, the fuse for each bit in the bit field must be blown individually. To accomplish this, the code representing the desired parameter value must be translated to a binary number. For example, as shown Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 12 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package in figure 3, decimal code 5 is equivalent to the binary number 101. Therefore bit 2 (code 4) must be addressed and blown, the device power supply cycled, and then bit 0 (code 1) addressed and blown. An appropriate sequence for blowing code 5 is shown in figure 4. The order of blowing bits, however, is not important. Blowing bit 0 first, and then bit 2 is acceptable. Note: After blowing, the programming is not reversible, even after cycling the supply power. Although a register bit field fuse cannot be reset after it is blown, additional bits within the same register can be blown at any time until the device is locked. For example, if bit 1 (binary 10) has been blown, it is still possible to blow bit 0. The end result would be binary 11 (decimal code 3). Locking the Device After the desired code for each parameter is programmed, the device can be locked to prevent further programming of any parameters. Additional Guidelines The additional guidelines in this section should be followed to ensure the proper behavior of these devices: • A 0.1 μF blowing capacitor, CBLOW, must be mounted between the VOUT pin and the GND pin during programming, to ensure enough current is available to blow fuses. • The CBLOW blowing capacitor must be replaced in the final application with a suitable CL. (The maximum load capacitance is 10 nF for proper operation.) Bit Field Selection Address Code Format (Decimal Equivalent) Code 5 • The power supply used for programming must be capable of delivering at least 26 V and 300 mA. • Be careful to observe the tLOW delay time before powering down the device after blowing each bit. Code in Binary (Binary) 101 Fuse Blowing Target Bits Bit 2 Bit 0 • The following programming order is recommended: 1. POL 2. TCSENS 3. Sens 4. VOUT(Q) 5. LOCK (only after all other parameters have been programmed and validated, because this prevents any further programming of the device) Fuse Blowing Address Code Format Code 4 Code 1 (Decimal Equivalents) Figure 3. Example of code 5 broken into its binary components, which are code 4 and code 1. V+ VP(HIGH) VP(MID) VP(LOW) Register Selection (Key 1) 0 VCC = 0 V Addressing (Code 4) Blow (Code 4 in Key 1) tBLOW VCC = 0 V Programming of Code 5 in Key 1 Addressing (Code 1) VCC = 0 V Register Selection (Key 1) Blow (Code 1 in Key 1) Figure 4. Example of programming pulses applied to the VOUT pin that result in permanent parameter settings. In this example, the register corresponding to key 1 is selected and code 5 is addressed and blown. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 13 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Programming Modes Try Mode Try mode allows a single programmable parameter to be tested without permanently setting its value. Multiple parameters cannot be tested simultaneously in this mode. After powering the VCC supply, select the desired parameter register and address its bit field. When addressing the bit field, each VPM pulse increments the value of the parameter register, up to the maximum possible code (see Programming Logic table). The addressed parameter value remains stored in the device even after the programming drive voltage is removed from the VOUT pin, allowing the value to be measured. Note that for accurate time measurements, the blow capacitor, CBLOW, should be removed during output voltage measurement. It is not possible to decrement the value of the register without resetting the parameter bit field. To reset the bit field, and thus the value of the programmable parameter, cycle the supply (VCC) voltage. Blow Mode After the required value of the programmable parameter is found using Try mode, its corresponding code should be blown to make its value permanent. To do this, select the required parameter register, and address and blow each required bit separately (as described in the Fuse Blowing section). The supply must be cycled between blowing each bit of a given code. After a bit is blown, cycling the supply will not reset its value. Lock Mode To lock the device, address the LOCK bit and apply a blow pulse with CBLOW in place. After locking the device, no future programming of any parameter is possible. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 14 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Programming State Machine Power-Up VPM Initial VPH Parameter Selection VPM VPM VPM TCSENS, POL, LOCK VPM VPH SENS VOUT(Q) VPH Bit Field Addressing VPM VPM VPM 2n – 1 n = total bits in register VPM 1 2 VPH VPM = VP(LOW) –VP(MID) –VP(LOW) VPH = VP(LOW) –VP(HIGH) –VP(LOW) Fuse Blowing User Power-Down Required Initial State After system power-up, the programming logic is Bit Field Addressing State This state allows the selection of the reset to a known state. This is referred to as the Initial state. All the bit field locations that have intact fuses are set to logic 0. While in the Initial state, any VPM pulses on the VOUT pin are ignored. To enter the Parameter Selection state, apply one VPH pulse on the VOUT pin. Parameter Selection State This state allows the selection of the individual bit fields to be programmed in the selected parameter register (see Programming Logic table). To leave this state, either cycle device power or blow the fuses for the selected code. Note that merely addressing the bit field does not permanently set the value of the selected programming parameter; fuses must be blown to do so. Fuse Blowing State To blow an addressed bit field, apply a parameter register containing the bit fields to be programmed. To select a parameter register, increment through the keys by applying VPM pulses on the VOUT pin. Register keys select among the following programming parameters: • 1 pulse - Sens • 2 pulses - VOUT(Q) • 3 pulses - TCSENS, POL, and LOCK To enter the Bit Field Addressing state, apply one VPH pulse on the VOUT pin. VPH pulse on the VOUT pin. Power to the device should then be cycled before additional programming is attempted. Note: Each bit representing a decimal code must be blown individually (see the Fuse Blowing section). Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 15 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Programming Logic Table Programmable Parameter (Register Key) Sens (1) VOUT(Q) (2) Bit Field Address Binary Format [MSB → LSB] 000000 111111 000000 111111 000000 000111 Decimal Equivalent Code 0 63 0 63 0 7 8 16 Description Initial value (Sensinit) Maximum value of sensitivity (Sens) in range Initial value (VOUT(Q)init) Maximum value of quiescent voltage output (VOUT(Q)) in range; B = 0 G Initial value of sensitivity temperature coefficient range (TCSensinit) Maximum value of sensitivity temperature coefficient (TCSens) in range POL bit, switches polarity (causes VOUT to increase with a negative [north polarity] field applied to the branded face of the device) LOCK bit, enables permanent locking of all programming bit fields in the device TCSENS , POL, LOCK (3) 001000 010000 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 16 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Package LH, 3 Pin; (SOT-23W) 3.00 .118 2.70 .106 0.15 [.006] M C A B 3.04 .120 2.80 .110 A A 1.49 .059 NOM 8º 0º 0.20 .008 0.08 .003 3 All dimensions reference only, not for tooling use Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only (reference JEDEC TO-236 AB, except case width and terminal tip-to-tip) Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Hall element (not to scale) Active Area Depth 0.28 [.011] Fits SC–59A Solder Pad Layout; adjust to process requirements B B A B C 2.10 .083 1.85 .073 A 0.96 .038 A NOM 0.60 .024 0.25 .010 1 2 0.25 .010 3X 0.10 [.004] C 3X 0.50 .020 0.30 .012 0.20 [.008] M C A B 0.95 .037 1.90 .075 SEATING PLANE 1.17 .046 0.75 .030 0.15 .006 0.00 .000 C SEATING PLANE GAUGE PLANE 0.70 .028 NOM 3 C 2.40 .094 NOM 1.00 .039 NOM 1 2 0.95 .037 NOM Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 17 A1381, A1382, A1383, and A1384 Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package Package UA, 3 Pin SIP .164 4.17 .159 4.04 C D .0805 2.04 NOM .062 1.57 .058 1.47 D .122 3.10 .117 2.97 .0565 1.44 NOM D B .085 2.16 MAX .031 0.79 REF A .640 16.26 .600 15.24 .017 0.44 .015 0.38 Dimensions in inches Metric dimensions (mm) in brackets, for reference only A Dambar removal protrusion (6X) B Ejector mark on opposite side C Active Area Depth .0195 [0.50] NOM D Hall element (not to scale); dimensions preliminary 1 .019 0.48 .014 0.36 2 3 .050 1.27 NOM Copyright ©2007, 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; 5,389,889; 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’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. 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. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 18