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A1667 Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A1667 Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 15 page True Zero-Speed, High Accuracy, Ring Magnet Sensor IC A1667 7 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL DESCRIPTION HALL TECHNOLOGY The single-chip differential Hall-effect sensor IC contains two Hall elements as shown in figure 1, which simultaneously sense the magnetic profile of the ring magnet. The magnetic fields are sensed at different points (spaced at a 2.2 mm pitch), generating adifferentialinternalanalogvoltage,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 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 proprietaryBiCMOSprocess. TARGET PROFILING DURING OPERATION 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 3 presents the automatic transla- tion of the mechanical profile, through the magnetic profile that it induces, to the digital output signal of the A1667. No addi- tional optimization is needed and minimal processing circuitry is required. This ease of use reduces design time and incremental assembly costs for most applications. DETERMINING OUTPUT SIGNAL POLARITY In figure 3, the top panel, labeled Mechanical Position, represents the mechanical features of the target ring magnet and orienta- tion to the device. The bottom panel, labeled Device Output Signal, displays the square waveform corresponding to the digital output signal that results from a rotating ring magnet configured as shown in figure 2. That direction of rotation (of the target side adjacent to the package face) 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 device output switching from low to high output state as the leading edge of a north magnetic pole passes the device face. In this configuration, the device output voltage switches to its high polarity when a north pole is the target feature nearest to the device. If the direction of rotation is reversed, then the output polarity inverts. Target (Ring Magnet) (Pin 1 Side) (Pin 4 Side) Hall IC Element Pitch Hall Element 1 Hall Element 2 N N S S N N N N N N S S N N S S S S S S Pin 1 Pin 1 Pin 4 Pin 4 Branded Face of K Package Branded Face of L Package Rotatin Rotatin g g T T arget arget BRP(#1) BOP(#1) BRP(#2) Off On On Off Device Internal Switch State Device Orientation to Target Device Internal Differential Analog Signal, VPROC Device Output Signal, VOUT (Pin 1 Side) (Pin 4 Side) IC Element Pitch Hall Element 1 Hall Element 2 Sensor Branded Face Target Magnetic Profile +B –B +t Mechanical Position (Target moves past device pin 1 to pin 4) N S S Target (Radial Ring Magnet) This pole sensed earlier This pole sensed later (View of Sensor Opposite Pins) Figure 1. Relative motion of the target is detected by the dual Hall elements mounted on the Hall IC. Figure 2. This left-to-right (pin 1 to pin 4) direction of target rotation results in a high output state when a north magnetic pole of the target is nearest the face of the device (see figure 3). A right-to-left (pin 4 to pin 1) rotation inverts the output signal polarity. Figure 3. The magnetic profile reflects the geometry of the target, allowing the A1667 to present an accurate digital output response. |
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