ATS642 Allegro MicroSystems, Inc., ATS642 Datasheet
ATS642
Available stocks
Related parts for ATS642
ATS642 Summary of contents
Page 1
... ATS642LSH-DS ATS642LSH Two-Wire True Zero Speed Miniature Differential The ATS642LSH is an optimized Hall effect sensing integrated circuit and magnet combination that provides a user-friendly solution for true zero-speed digital gear-tooth sensing in two-wire applications. The sensor consists of a single-shot molded plastic package that includes a samarium cobalt magnet, a pole piece, and a Hall effect IC that has been optimized to the magnetic circuit ...
Page 2
... True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor Hall Amplifier Automatic Offset Control Tracking DAC ATS642LSH-DS ATS642LSH Functional Block Diagram Gain AOA DAC AGC DAC Gain Control Peak Hold VCC Internal Regulator GND Test Test Signals Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www ...
Page 3
... mA 25° CC(max) A Test conditions only ATS642LSH-I1 ATS642LSH-I2 ATS642LSH-I1 ATS642LSH-I2 / Ratio of high current to low current V = –18 V RCC t > Target gear speed < 100 rpm R = 100 Ω LOAD LOAD within specifi cation, unless otherwise noted 1 Min ...
Page 4
... DC(n) - DC(n-1); Mean ± 3-sigma order to remain in specifi cation, the magnetic gradient must induce an operating signal greater than the minimum value specifi ed. This includes the effect of target wobble. ATS642LSH-DS ATS642LSH Symbol Test Conditions S Reference Target 60-0 ROT BW Equivalent to f – ...
Page 5
... Air Gap (mm) 500 400 300 200 100 0 -100 -200 -300 -400 -500 ATS642LSH-DS ATS642LSH Test Conditions Typ. Outside diameter of target 120 Breadth of tooth, with 6 respect to sensor Length of tooth, with 3 respect to sensor Length of valley, with 3 respect to sensor 3 Low Carbon Steel – ...
Page 6
... True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor Supply Current (High) versus Ambient Temperature (ATS642-I1 - (°C) A Supply Current (Low) versus Ambient Temperature (ATS642 (°C) A ATS642LSH-DS ATS642LSH Characteristic Data I1 Trim (V) ...
Page 7
... Duty Cycle versus Ambient Temperature – (°C) A ATS642LSH-DS ATS642LSH Duty Cycle versus Air Gap 0.5 1.0 1.5 2.0 AG (mm (mm) 0 ...
Page 8
... AG (OPmax) (a) Sensor For more information on these fi gures and the calculations used to generate them, please refer to the Applications Note Determining Allowable Air Gap Variation for the ATS642. ATS642LSH-DS ATS642LSH 60-0 (60 Tooth Target) Allowable Air Gap Movement from TEAG 1 ...
Page 9
... True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information CHARACTERISTIC Package Thermal Resistance *Additional information is available on the Allegro Web site. ATS642LSH-DS ATS642LSH Symbol TEST CONDITIONS* Single-layer PCB with copper limited to solder pads R Two-layer PCB with 3.8 in. ...
Page 10
... Figure 4: Voltages profi les for high side and low side two-wire sensing low I CC(High) (see fi gure 4). SENSE OUT SUPPLY VCC VCC ATS642 ATS642 GND GND OUT(L) R SENSE I+ I OUT V+ V OUT( OUT(H) Allegro MicroSystems, Inc. ...
Page 11
... Differences in the air gap affect the magnetic gradient, but AGC prevents that from affecting device performance, a shown in the lowest panel. ATS642LSH-DS ATS642LSH to compensate for offsets induced by temperature variations over time. Digital Peak Detection A digital DAC tracks the internal analog voltage signal V and is used for holding the peak value of the internal analog signal. In the example shown in fi ...
Page 12
... Pins 2 and 3 floating ECU 100 Ω R SENSE Figure 7: Typical Application Circuit ATS642LSH-DS ATS642LSH Assembly Description This sensor 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. Diagnostics The regulated current output is confi ...
Page 13
... CC CCMIN period of time is required to power the various portions of the IC. During this period, the ATS642 will power-on in the high current state After power on, there are conditions that CC(High) could induce a change in the output state. Such an event could be caused by thermal transients, but would require a static applied magnetic fi ...
Page 14
... I ), without exceeding T CC(max) CC(max selected R and T . θJA A ATS642LSH-DS ATS642LSH Power Derating Example: Reliability for V (I1 trim), using minimum-K PCB Observe the worst-case ratings for the device, specifi cally: R θJA I CC(max) Calculate the maximum allowable power level, P invert equation fi ...
Page 15
... True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor 5.8 .228 5.0 .244 20.95 .825 13.05 .514 ATS642LSH-DS ATS642LSH Package SH Module 0.75 .0295 E 0.75 .0295 E 8.0 .315 4.0 .157 1.7 .067 .039 0.6 .024 A 0.6 .024 1.27 .050 Dimensions in millimeters. Untoleranced dimensions are nominal. U.S. Customary dimensions (in.) in brackets, for reference only ...
Page 16
... True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor ATS642LSH-DS ATS642LSH 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 de par tures from the detail spec i fi ...