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ATS642LSH Dataheets PDF



Part Number ATS642LSH
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Peak-Detecting Gear Tooth Sensor
Datasheet ATS642LSH DatasheetATS642LSH Datasheet (PDF)

ATS642LSH Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor with Continuous Calibration Features and Benefits ▪ Running mode calibration for continuous optimization ▪ Single chip IC for high reliability ▪ Internal current regulator for 2-wire operation ▪ Small mechanical size (8 mm diameter × 5.5 mm depth) ▪ Precise duty cycle signal over operating temperature range ▪ Large operating air gaps ▪ Automatic Gain Control (AGC) for air gap independent switchpoints ▪ Au.

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ATS642LSH Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor with Continuous Calibration Features and Benefits ▪ Running mode calibration for continuous optimization ▪ Single chip IC for high reliability ▪ Internal current regulator for 2-wire operation ▪ Small mechanical size (8 mm diameter × 5.5 mm depth) ▪ Precise duty cycle signal over operating temperature range ▪ Large operating air gaps ▪ Automatic Gain Control (AGC) for air gap independent switchpoints ▪ Automatic Offset Adjustment (AOA) for signal processing optimization ▪ True zero-speed operation ▪ Undervoltage lockout ▪ Wide operating voltage range Package: 4-pin Module (suffix SH) Not to scale Description 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 twowire 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. This small package, with optimized two-wire leadframe, can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. The integrated circuit incorporates a dual element Hall effect sensor and signal processing that switches in response to differential magnetic signals created by ferrous gear teeth. The circuitry contains a sophisticated digital circuit to reduce magnet and system offsets, to calibrate the gain for air gap independent switchpoints, and to achieve true zero-speed operation. Signal optimization occurs at power-up through the combination of offset and gain adjust and is maintained throughout the operating time with the use of a running mode calibration. The running mode calibration allows immunity to environmental effects such as microoscillations of the target or sudden air gap changes. The regulated current output is configured for two wire applications and the sensor is ideally suited for obtain- Continued on the next page… Engineering samples available on a limited basis. Contact your local sales or applications support office for additional information. Functional Block Diagram Hall Amplifier Gain VCC Automatic Offset Control AOA DAC Tracking DAC Peak Hold AGC DAC Gain Control ATS684LSH-DS, Rev. 2 MCO-0000868 Internal Regulator Test Signals GND Test May 21, 2020 ATS642LSH Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor with Continuous Calibration Description (continued) ing speed and duty cycle information in ABS (antilock braking systems). The 1.5 mm Hall element spacing is optimized for fine pitch gear-tooth-based configurations. The package is lead (Pb) free, with 100% matte tin leadframe plating. Selection Guide Part Number ATS642LSHTN-I1-T ICC Typical 6.0 Low to 14.0 High mA ATS642LSHTN-I2-T 7.0 Low to 14.0 High mA *Contact Allegro™ for additional packing options Packing* Tape and reel, 13-inch reel 800 pieces/reel Absolute Maximum Ratings Characteristic Supply Voltage Reverse_Supply Voltage Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VCC VRCC TA TJ(max) Tstg Range L Notes Rating Unit 28 V –18 V –40 to 150 ºC 165 ºC –65 to 170 ºC Pin-out Diagram 12 3 4 Terminal List Number Name 1 VCC 2 NC 3 Test pin 4 GND Function Connects power supply to chip No connection Float or tie to GND Ground terminal 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ATS642LSH Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor with Continuous Calibration OPERATING CHARACTERISTICS using reference target 60-0, TA and VCC within specification, unless otherwise noted Characteristic Symbol Test Conditions Min. Typ.1 Max. Units ELECTRICAL CHARACTERISTICS Supply Voltage2 Undervoltage Lockout Supply Zener Clamp Voltage Supply Zener Current Supply Current VCC VCC(UV) VZ Operating; TJ < 165 °C VCC 0 → 5 V and 5 → 0 V ICC = ICC(max) + 3 mA; TA = 25°C IZ Test conditions only; VZ = 28 V ATS642LSH-I1 ICC(Low) ATS642LSH-I2 ATS642LSH-I1 ICC(High) ATS642LSH-I2 4.0 – 28 – 4.0 5.9 12.0 11.8 – 24 V – 4.0 V – – V – ICC(max)+ 3 mA mA 6.0 8.0 mA 7.0 8.4 mA 14.0 16.0 mA 14.0 16.8 mA Supply Current Ratio Reverse Battery Current / ICC(High) ICC(Low) IRCC Ratio of high current to low current VRCC = –18 V POWER-ON STATE CHARACTERISTICS 1.85 – 3.05 – – – –5 mA Power-On State3 Power-On Time4 OUTPUT STAGE POS tPO t > tPO Target gear speed < 100 rpm – ICC(High) – – – 1 2 ms Output Slew Rate5 dI/dt RLOAD = 100 Ω, CLOAD = 10 pF – 10 – mA/μs Continued on the next page. 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ATS642LSH Two-Wire Tru.


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