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A1642LK Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1642LK Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 13 page 8 A1642LK-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration A1642LK Sensing Technology The single-chip differential Hall effect sensor IC possesses two Hall elements, which sense the magnetic profile of the ring mag- net simultaneously, but at different points (spaced at a 1.5 mm pitch), generating a differential internal analog voltage, VPROC, that is processed for precise switching of the digital output signal. The Hall IC is self-calibrating and also possesses a temperature compensated amplifier and offset compensation 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 compensation circuitry. The Hall transducers and signal process- ing electronics are integrated on the same silicon substrate, using a proprietary BiCMOS process. Target Profiling An operating device is capable of providing digital informa- tion that is representative of the magnetic features on a rotating target. The waveform diagram shown in figure 3 presents the automatic translation of the magnetic profile to the digital output signal of the sensor. Output Polarity Figure 3 shows the output polarity for the orientation of target and sensor shown in figure 2. The target direction of rotation shown is: perpendicular to the leads, across the face of the device, from the pin 1 side to the pin 4 side. This results in the sensor output switching from high, ICC(High), to low ICC(Low), as the leading edge of a north magnetic pole passes the sensor face. In this configuration, the device output current switches to its low polarity when a north pole is the target feature nearest to the sensor. If the direction of rotation is reversed, then the output polarity inverts. Note that output voltage polarity is dependent on the position of the sense resistor, RSENSE (see figure 4). Target (Ring Magnet) (Pin 1 Side) (Pin 4 Side) Hall IC Element Pitch Hall Element 1 Hall Element 2 N N S S of Sensor Rotating Target Branded Face 1 4 Functional Description Figure 1. Relative motion of the target is detected by the dual Hall ele- ments mounted on the Hall IC. Figure 2. This left-to-right (pin 1 to pin 4) direction of target rotation results in a low output signal when a magnetic north pole of the target is nearest the face of the sensor (see figure 3). A right-to-left (pin 4 to pin 1) rotation inverts the output signal polarity. Figure 4: Voltages profiles for high side and low side two-wire sensing. Figure 3. Output Profile of a ring magnet target for the polarity indicated in figure 2. A1642 VCC GND V CC I CC 1 4 VOUT(L) A1642 VCC GND V SUPPLY 1 4 VOUT(H) I CC R SENSE R SENSE IOUT VOUT(H) V+ VOUT(L) V+ I+ N N S S Representative Differential Magnetic Profile Target Ring Magnet Sensor Electrical Output Profile, IOUT |
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