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A1642LKNTN-I2-T Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A1642LKNTN-I2-T Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 14 page Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor IC with Continuous Calibration A1642 10 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 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 pro- tection 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. Undervoltage Lockout When the supply voltage falls below the undervoltage lockout voltage, VCC(UV), the device enters Reset, where the output state returns to the Power-On State (POS) until sufficient VCC is sup- plied. ICC levels may not meet datasheet limits when VCC < VCC(min). Assembly Description This device 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 configured for two wire appli- cations, requiring one less wire for operation than do switches with the more traditional open-collector output. Additionally, the system designer inherently gains diagnostics because there is always output current flowing, which should be in either of two narrow ranges, shown in figure 8 as ICC(High) and ICC(Low). Any current level not within these ranges indicates a fault condi- tion. If ICC > ICC(High)max, then a short condition exists, and if ICC < ICC(low)min, then an open condition exists. Any value of ICC between the allowed ranges for ICC(High) and ICC(Low) indicates a general fault condition. Figure 7: Typical Application Circuit A1642 VCC GND V+ 0.01 1 4 µF ECU Pins 2 and 3 floating R 100 Ω SENSE CBYP Figure 8: Diagnostic Characteristics of Supply Current Values ICC(High)max ICC(High)min Range for Valid ICC(HIGH) Range for Valid ICC(LOW) ICC(Low)max ICC(Low)min 0 +mA Short Fault Open |
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