ATS605LSGTN-S-T

ATS605LSG Dual Output Differential Speed and Direction Sensor IC Description Features and Benefits • Two independent digital outputs representing the sensed target’s mechanical profile • Optional output with high resolution position and direction detection information • Air gap independent switch points • Integrated back-biasing magnetic circuit • Immunity to external magnetic interference • Wide operating voltage range • Single chip IC for high reliability • Robust test coverage and reliability using Scan and IDDQ test methodologies • Optional Double-Bandwidth configuration The ATS605LSG provides a single IC solution to rotational position sensing applications with a ferrous gear target. The SG package incorporates a rare earth pellet for ease of manufacturing, consistent performance over temperature, and enhanced reliability. Three Hall elements are incorporated to create two independent differential channels. These channels are processed by the IC which contains a sophisticated digital circuit designed to eliminate the detrimental effects of magnet and system offsets. Hall differential signals are used to produce a highly accurate speed output and, if desired, provide information on the direction of rotation. Advanced calibration techniques are used to optimize signal offset and amplitude. This calibration, combined with the digital tracking of the signal, results in accurate switch-points over air gap, speed, and temperature. The open-drain outputs provide voltage output signals which mirror the sensed target’s shape, with a phase separation between the two channels proportionate to the size of the target teeth vs. the Hall element spacing. This sensor IC system is optimized for a variety of applications requiring dual phase gear speed and position signal information or simultaneous high-resolution gear speed and direction information. Package: 4-pin SIP (suffix SG) The ATS605 is offered in a lead (Pb) free 4-pin SIP package with an integrated back-basing magnet with a 100% matte tin plated leadframe. Not to scale Functional Block Diagram VCC Test REGULATOR (Analog) REGULATOR (Digital) SPEED A DIRECTION Hall Amp OFFSET ADJUST AGC FILTER Current Limit ADC SYNCHRONOUS DIGITAL CONTROLLER OFFSET ADJUST AGC FILTER Switch OUT A MULTIPLEXED SIGNALS Test Hall Amp Test SPEED B XOR SPEED MULTIPLEXED SIGNALS Current Limit Test Switch OUT B ADC GND ATS605LSG-DS Dual Output Differential Speed and Direction Sensor IC ATS605LSG Selection Guide Part Number Operating Ambient Temperature Range TA, (°C) Output Configuration Operational Frequency (kHz) Packing* ATS605LSGTN-S-T –40 to 150 Speed (OUTA); Speed (OUTB) 20 800 pieces per 13-in. reel ATS605LSGTN-S-H-T –40 to 150 Speed (OUTA); Speed (OUTB) 40 800 pieces per 13-in. reel ATS605LSGTN-F-T –40 to 150 Direction (OUTA); XOR Speed (OUTB) 20 800 pieces per 13-in. reel ATS605LSGTN-F-H-T –40 to 150 Direction (OUTA); XOR Speed (OUTB) 40 800 pieces per 13-in. reel ATS605LSGTN-R-T –40 to 150 Inverse Direction (OUTA); XOR Speed (OUTB) 20 800 pieces per 13-in. reel ATS605LSGTN-R-H-T –40 to 150 Inverse Direction (OUTA); XOR Speed (OUTB) 40 800 pieces per 13-in. reel *Contact Allegro™ for additional packing options. Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit 28 V Supply Voltage VCC Reverse Supply Voltage VRCC –18 V Reverse Supply Current IRCC –50 mA Reverse Output Voltage VROUT –0.5 V Forward Output Voltage VOUT 28 V 25 mA Output Sink Current IOUTSINK Refer to Power Derating section Internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation. Operating Ambient Temperature TA –40 to 150 ºC Maximum Junction Temperature TJ(max) 165 ºC Tstg –65 to 170 ºC Storage Temperature Pin-out Diagram Branded Face 1 2 3 L temperature range Terminal List Table Number Name Descritpion 1 VCC 2 OUTB Option [-S]: Speed (OUTB) Option [-F]: XOR Speed Option [-R]: XOR Speed 3 OUTA Option [-S]: Speed (OUTA) Option [-F]: Default Direction Option [-R]: Inverse Direction 4 GND Ground Supply voltage 4 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 Dual Output Differential Speed and Direction Sensor IC ATS605LSG OPERATING CHARACTERISTICS: over operating voltage and temperature range, unless otherwise noted Characteristic Symbol Test Conditions Min. Typ. 1 Max. Unit Electrical Characteristics Supply Voltage VCC Reverse Supply Voltage VRCC Under Voltage Lockout VCC(UV) Reverse Supply Current IRCC Supply Zener Clamp Voltage Supply Current VZsupply ICC Operating, TJ < TJ(max) 4.0 – 24 V –18 – – V VCC from 0 → 5 V or 5 → 0 V – – 3.95 V VCC = -18 V – – –10 mA ICC = ICC(max) + 3 mA, TA = 25ºC 28 – – V Output OFF (VOUT = High) – 8.5 13 mA Output ON (VOUT = Low) – 8.5 13 mA VOUTA, VOUTB, as connected in Figure 7 – High – fOP < 200 Hz – – 2 ms Power-On State Characteristcs Power-On State Power On Time2,3 POS tPO Output Stage for Each Output Pin Low Output Voltage IOUT = 10 mA, Output = ON – 165 350 mV Output Zener Clamp Voltage VOUT(SAT) VZoutput IOUT = 3 mA, TA = 25 °C 28 – – V Output Current Limit IOUT(LIM) Output = ON (VOUT = Low), measured with RPULLUP = 0 Ω, TJ < TJ(MAX) 30 55 85 mA Output Leakage Current IOUT(OFF) Output = OFF, VOUT = 24 V – – 10 μA Output Rise Time tr 10% - 90%, VPU = 12V, RPULLUP = 1 kΩ, CL = 4.7 nF – 10 – μs Output Fall Time tr 90% - 10%, VPU = 12V, RPULLUP = 1 kΩ, CL = 4.7 nF – 0.6 – μs –60 – 60 G Allegro® reference target 0 – – kHz Allegro® reference target – 20 – kHz Allegro® reference target, double-bandwidth option, suffix “-H” – 40 – kHz DAC Characteristics Allowable User-Induced Magnetic Offset4,5 BDIFFEXT User induced differential offset Switch Point Characteristics Minimum Operational Frequency fOPmin Maximum Operational Frequency fOPmax Cutoff frequency for low-pass filter – 20 – kHz Analog Signal Bandwidth f-3dB Cutoff frequency for low-pass filter, doublebandwidth option – 40 – kHz Operate Point BOP % of VPROC(PKPK), Output OFF to ON – 70 – % Release Point BRP % of VPROC(PKPK), Output ON to OFF – 30 – % Lockout Enable VLOE VPROC(PKPK) < VLOE = Output Switching Disabled – 250 – mV Lockout Release VLOR VPROC(PKPK) > VLOE = Output Switching Enabled – 350 – mV Continued on the next page… 1Typical data is at VCC = 12 V and TA = +25°C. Performance may vary for individual units, within the specified maximum and minimum limits. Time is the time required to complete the internal automatic offset adjust; the registers are then ready for peak acquisition. 3High speed power-on compliant, however several missing output transitions are possible. 41 G (gauss) = 0.1 mT (millitesla). 5The device compensates for magnetic and installation offsets. Offsets greater than specification in gauss may cause inaccuracies in the output. 2Power-On Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 Dual Output Differential Speed and Direction Sensor IC ATS605LSG OPERATING CHARACTERISTICS (continued) Valid throughout full operating and temperature ranges; using Reference Target 60-0; unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.7 Max. Unit – 1 – tooth – 3 8 edge 0.75 – 3 mm Delay between first XOR SPEED output transition and reported direction change – 400 – ns Differential magnetic signal reduction due to instantaneous air gap change; symmetrical signal reduction, fOP < 500 Hz, VPROC(PKPK) > VLOE after sudden air gap change – 40 – % pk-pk Valid for SPEED(OUTA) and SPEED(OUTB) 40 50 60 % fOP < 10,000 Hz, Output switching (no missed edges) – 30 – G fOP ≥ 10,000 Hz, Output switching (no missed edges) – 60 – G Calibration First Output Edge Initial Calibration8 – fOP < 600 Hz, VCC > VCC(MIN) CALI Operating Characteristics (with Allegro 60-0 reference target) Operational Air Gap Range9 Direction Output Delay Maximum Sudden Air Gap Change / Signal Reduction10 Duty Cycle Variation Minimum Operating Signal11 AG td ΔBIN ΔD BIN 7Typical data is at VCC = 12 V and TA = +25°C. Performance may vary for individual units, within the specified maximum and minimum limits. reduced edge accuracy, ΔD not guaranteed. Edges are sensed target mechanical edges (see Definitions of Terms for Switchpoints). air gap is dependent on the available magnetic field. The available field is target geometry and material dependent and should be independently characterized. 10Maximum single outward sudden allowable air gap change is in outward direction (increase in air gap). 11Minimum operating signal, for either operating frequency range, is the differential magnetic field. 8Possible 9Operating Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 Dual Output Differential Speed and Direction Sensor IC ATS605LSG Definitions of Terms for Switchpoints Definitions of Terms for Switchpoints Sensed Edgea Differential Processed Signal, VProc (V) Differential Magnetic Flux Density, BDIFF (G) Reverse Tooth Forward Valley +B BOP(REV)b BOP(FWD)b BRP(REV) BRP(FWD) –B +V VPROC(BOP) 100 % VPROC(BRP) BOP % BRP % –V t aSensed Edge: leading (rising) mechanical edge in forward rotation, trailing (falling) mechanical edge in reverse rotation bB triggers the output transition during forward rotation, and BOP(REV) triggers the output(falling) transition during reverse rotation OP(FWD) Figure 1: (a) Sensed Edge: leading (rising) mechanical edge in forward rotation, trailing mechanical edge in reverse rotation; (b) BOP(FWD) triggers the output transition during forward rotation, and BOP(REV) triggers the output transition during reverse rotation. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 Dual Output Differential Speed and Direction Sensor IC ATS605LSG REFERENCE TARGET CHARACTERISTICS 60-0 (60 Tooth Target) Unit DO 120 mm Face Width F Breadth of tooth, with respect to sensor IC 6 mm Circular Tooth Length t Length of tooth, with respect to sensor IC; measured at DO 3 deg Circular Valley Width tv Length of valley, with respect to sensor IC; measured at DO 3 deg Tooth Whole Depth ht 3 mm – – Material Test Conditions Low Carbon Steel Symbol Key Do ht F tv Typ. Outside Diameter of Target Outside Diameter Symbol Branded Face of Package t Characteristics Air Gap Figure 2: Example of Allegro Reference Gear Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 Dual Output Differential Speed and Direction Sensor IC ATS605LSG Functional Description Sensing Technology Target Profiling During Operation The ATS605 module contains a single-chip, dual differential Hall-effect sensor IC, a rare earth pellet, and a flat ferrous pole piece (concentrator). As shown in Figure 4, the Hall IC supports three Hall elements, which sense the magnetic profile of the ferrous gear target simultaneously, but at different points (each channel spaced at a 1.75 mm pitch), generating two differential internal analog voltages, VPROC, that is processed for precise switching of the digital output signals. An operating device is capable of providing digital information that is representative of the mechanical features of a rotating gear. The waveform diagram in Figure 4 presents the automatic translation of the mechanical profile, through the magnetic profile that it induces, to the digital output signal of the ATS605. No additional optimization is needed and minimal processing circuitry is required. This ease of use reduces design time and incremental assembly costs for most applications. The Hall IC is self-calibrating and also possesses a temperature compensated amplifier and offset cancellation circuitry. Its voltage regulator provides supply noise rejection throughout the operating voltage range. Changes in temperature do not greatly affect this device due to the stable amplifier design and the offset rejection circuitry. The Hall transducers and signal processing electronics are integrated on the same silicon substrate, using a proprietary BiCMOS process. Operating Modes: Calibration Once the power-on time has elapsed, the sensor IC internally detects the magnetic profile of the target. The output becomes active at the first detected switchpoint. The gain of the sensor IC is adjusted during the Calibration period, normalizing the internal signal amplitude for the air gap range of the device. This Automatic Gain Control (AGC) feature ensures that operational characteristics are isolated from the effects of installation air gap variation. Automatic Offset Adjustment (AOA) is circuitry that compensates for the effects of chip, magnet, and installation offsets. (For capability, see Allowable User-Induced Magnetic Offset, in the Operating Characteristics table.) This circuitry works with the AGC during calibration to help center VPROC in the dynamic range to allow for DAC acquisition of signal peaks. Calibration also allows for the peak detecting DACs to properly acquire the magnetic signal, so that Running Mode switchpoints can be accurately computed. Running Mode After calibration is complete, direction information is available. This information is communicated through the available output option. Peak-tracking DAC algorithms allow tracking of signal drift over temperature changes, as well as tracking of target variations, such as tooth-to-tooth variation and effective runout. The sensor’s dynamic monitoring of these signal peaks is updated on each tooth and valley edge. Figure 3: Target Rotation for Default Sensing Configuration. (A) Pin 4 to pin 1 is forward, and (B) pin 1 to pin 4 is reverse. Automatic Offset Adjust remains active, allowing the IC to compensate for offsets induced by temperature variations over time. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 ATS605LSG Dual Output Differential Speed and Direction Sensor IC Output The device provides three outputs (DIRECTION, XOR SPEED, and SPEED), available in two combinations: Option #1 (-S) is SPEED (Ch. A) and SPEED (Ch. B), and Option #2 (-F) is XOR SPEED and DIRECTION. DIRECTION provides the target rotation direction relative to the device. XOR SPEED provides an XOR’d output of the two speed channels (Ch. A and Ch. B), which results in double the speed data rate without requiring changes to be made to the controller. SPEED will be updated before DIRECTION and is updated at every transition of both Channel A and Channel B allowing the use of up-down counters without the loss of pulses. Output Polarity In Figure 4, the top panel, labeled Mechanical Position, represents the mechanical features of the target gear and orientation to the device. The bottom panel, labeled Output Option # 1, the –S variant, displays the square waveforms corresponding to the digital SPEED output signals for channels A and B for a rotating gear in the forward rotation direction (gear tooth passing from the pin 4 side to the pin 1 side, Figure 3). The end result is the sensor output switching from high state to low state as the leading edge of a tooth (a rising mechanical edge, as detected by the sensor) passes the sensor face. If the direction of rotation is reversed so that the gear rotates from the pin 1 side to the pin 4 side (Figure 3), then the output polarity inverts (i.e., the output signal goes high when a rising edge is detected, and a tooth is the nearest feature to the sensor). The Output Option #2 panel refers to the –F variant, for which DIRECTION polarity is defined as ON (low) when the target crosses the sensor face in the forward direction (from the pin 4 side to the pin 1 side), and OFF (high) for the reverse direction (from the pin 1 side to the pin 4 side). There is an option, ATS605LSGTN-R-T, that inverts this DIRECTION output signal polarity (SPEED output polarity is unaffected and remains as defined above). XOR SPEED polarity is defined as SPEED A XOR SPEED B. Table 1: Output Pin Descriptions Figure 4: The magnetic profile reflects the geometry of the target, allowing the ATS605 to present an accurate digital output response. Please see Figure 5 for more detailed output switching. Option Pin 2 / OUTB Pin 3 / OUTA Option 1 (“-S”) SPEED B SPEED A Option 2 (“-F”) XOR SPEED DIRECTION Option 2 (“-R”) XOR SPEED Inverted DIRECTION Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 ATS605LSG Dual Output Differential Speed and Direction Sensor IC BCHA BCHB Channel A Channel B OUTA: OUTB: Figure 5: Direction change, first showing the default forward rotation output polarity and then for the same output configuration, the reverse direction polarity is shown (Pin 4 to Pin 1 is FWD). Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9 Dual Output Differential Speed and Direction Sensor IC ATS605LSG Under Voltage Lockout Device Features When the supply voltage falls below the under voltage lockout voltage, UVLO, the device enters Reset, where the output state returns to the Power-On State (POS) until sufficient VCC is supplied. ICC levels may not meet datasheet limits when VCC < VCC(min). This lockout feature prevents false signals, caused by under voltage conditions, from propagating to the output of the sensor. Power Supply Protection The device contains an on-chip regulator and can operate over a wide VCC range. For devices that need to operate from an unregulated power supply, transient protection must be added externally. For applications using a regulated line, EMI/RFI protection may still be required. Contact Allegro MicroSystems for information on the circuitry needed for compliance with various EMC specifications. Refer to Figure 7 for an example of a basic application circuit. Automatic Gain Control (AGC) This feature allows the device to operate with an optimal internal electrical signal, regardless of the air gap (within the AG specification). At power-on, the device determines the peak-to-peak amplitude of the signal generated by the target. The gain of the sensor is then automatically adjusted. Figure 6 illustrates the effect of this feature. Automatic Offset Adjust (AOA) The AOA circuitry automatically compensates for the effects of chip, magnet, and installation offsets. (For capability, see Allowable User-Induced Magnetic Offset, in the Operating Characteristics table.) This circuitry is continuously active, including both during power-on mode and running mode, compensating for any offset drift (within Allowable User-Induced Magnetic Offset). Continuous operation also allows it to compensate for offsets induced by temperature variations over time. Lockout The ATS605 has a lockout feature to prevent switching on small signals that are characteristic of vibration signals. The internal logic of the chip will consider small signal amplitudes below a certain level to be vibration. The output will then be held to the state prior to lockout until the amplitude of the signal returns to normal operational levels. Lockout is independent between speed channels for the SPEED and SPEED output configuration, allowing one channel to continue switching without the other. The alternative XOR SPEED and DIRECTION configuration requires both channels to exceed the lockout release value before enabling these output signals. Assembly Description The ATS605 is integrally molded into a plastic body that has been optimized for size, ease of assembly, and manufacturability. High operating temperature materials are used in all aspects of construction. VCC RS R PULLUP(B) R PULLUP(A) 1 ATS605 VOUTB 2 C LOAD(B) VOUTA 3 4 C BYP 0.1 µF C LOAD(A) GND Figure 7: Typical Application Circuit Figure 6: Automatic Gain Control (AGC). The AGC function corrects for variances in the air gap. Differences in the air gap cause differences in the magnetic field at the device, but AGC prevents that from affecting device performance, as shown in the lower panel. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 10 Dual Output Differential Speed and Direction Sensor IC ATS605LSG Start Mode Hysteresis This feature helps to ensure optimal self-calibration by rejecting electrical noise and low-amplitude target vibration during initialization. This prevents AGC from calibrating the IC on such spurious signals. Calibration can be performed using the actual target features. A typical scenario is shown in Figure 8. The Start Mode Hysteresis, POHYS, is a minimum level of the peak-to-peak amplitude of the internal analog electrical signal, VPROC, that must be exceeded before the ATS605 starts to compute switchpoints. Figure 8: Operation of Start Mode Hysteresis • At power-on (position 1), the ATS605 begins sampling VPROC. • At the point where the Start Mode Hysteresis, POHYS, is exceeded, the device establishes an initial switching threshold, by using the Continuous Update algorithm. If VPROC is falling through the limit on the low side (position 2), the switchpoint is BRP, and if VPROC is rising through the limit on the high side (position 4), it is BOP. After this point, Start Mode Hysteresis is no longer a consideration. Note that a valid VPROC value exceeding the Start Mode Hysteresis can be generated either by a legitimate target feature or by excessive vibration. • In either case, because the switchpoint is immediately passed as soon as it is established, the ATS605 enables switching: --If on the low side, at BRP (position 2) the output would switch from low to high. However, because output is already high, no output switching occurs. At the next switchpoint, where BOP is passed (position 3), the output switches from high to low. --If on the high side, at BOP (position 4) the output switches from high to low. As this example demonstrates, initial output switching occurs with the same polarity, regardless of whether the Start Mode Hysteresis is exceeded on the high side or on the low side Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 11 ATS605LSG Dual Output Differential Speed and Direction Sensor IC Characteristic Performance Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 12 ATS605LSG Dual Output Differential Speed and Direction Sensor IC Characteristic Performance, continued Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 13 Dual Output Differential Speed and Direction Sensor IC ATS605LSG Thermal Characteristics Characteristic Package Thermal Resistance Symbol RqJA Value Unit Minimum-K PCB, single-layer, single-sided, with copper limited to solder pads) Test Conditions 126 ºC/W Low-K PCB, single-layer, single-sided with copper limited to solder pads and 3.57 in.2 (23.03 cm2) of copper area each side 84 ºC/W VCC(max) VCC(min) Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 14 Dual Output Differential Speed and Direction Sensor IC ATS605LSG 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.) 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. 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. RθJA = 126°C/W, TJ(max) = 165°C, VCC(max) = 24 V, and 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 SG, using single-layer PCB. Observe the worst-case ratings for the device, specifically: ICC = 13 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: ∆Tmax = 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) = ∆Tmax ÷ RθJA = 15°C ÷ 126°C/W = 119 mW Finally, invert equation 1 with respect to voltage: PD = VIN × IIN (1) VCC(est) = PD(max) ÷ ICC(max) = 119 mW ÷ 13 mA = 9.2 V ∆T = PD × RθJA (2) The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤ VCC(est). TJ = TA + ∆T (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, RθJA = 126°C/W, and ICC = 8.5 mA, then: PD = VCC × ICC = 12 V × 8.5 mA = 102 mW ∆T = PD × RθJA = 102 mW × 126°C/W = 12.9°C TJ = TA + ∆T = 25°C + 12.9°C = 37.9°C Compare VCC(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. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 15 Dual Output Differential Speed and Direction Sensor IC ATS605LSG Package SG, 4-Pin SIP 5.50 ±0.05 F F 1.75 1.75 E B 8.00 ±0.05 E2 LLLLLLL F NNN E1 5.80 ±0.05 E3 F F YYWW Branded Face 1.70 ±0.10 D Standard Branding Reference View 4.70 ±0.10 1 2 3 4 L N Y W A 0.60 ±0.10 0.71 ±0.05 = Supplier emblem = Lot identifier = Last three numbers of device part number = Last two digits of year of manufacture = Week of manufacture For Reference Only, not for tooling use (reference DWG-9200) Dimensions in millimeters A Dambar removal protrusion (16X) 0.38 +0.06 –0.04 24.65 ±0.10 B Metallic protrusion, electrically connected to pin 4 and substrate (both sides) C Thermoplastic Molded Lead Bar for alignment during shipment D Branding scale and appearance at supplier discretion E Active Area Depth, 0.43 mm 0.40 ±0.10 15.30 ±0.10 F Hall elements (E1, E2, E3), not to scale 1.0 REF A 1.60 ±0.10 C 1.27 ±0.10 0.71 ±0.10 0.71 ±0.10 5.50 ±0.10 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 16 ATS605LSG Dual Output Differential Speed and Direction Sensor IC Copyright ©2014, 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. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 17