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A1698LUBTN-FWBE-T Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1698LUBTN-FWBE-T Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 13 page Two-Wire, True Zero-Speed, High Accuracy Sensor IC with Speed and Direction Output A1698 8 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com FUNCTIONAL DESCRIPTION The sensor IC contains a single-chip Hall-effect circuit that supports a trio of Hall elements. These elements are used in differential pairs to provide electrical signals containing informa- tion regarding edge position and direction of target rotation. The A1698 is intended for use with ring magnet targets, or, when back-biased with an appropriate magnet, with ferromagnetic targets (gears). The IC detects the peaks of the magnetic signals and sets dynamic thresholds based on these detected signals. Data Protocol Description When a target passes in front of the device (opposite the branded face of the package case), the A1698 generates an output pulse for each magnetic pole, or each tooth and valley, of the target. Speed information is provided by the output pulse rate, while direction of target rotation is provided by the duration of the output pulses. The sensor IC can sense target movement in both the forward and reverse directions. The translation of magnetic input to the output is shown in Figure 6. FORWARD ROTATION For the –F variant, when the target is rotating such that a target feature passes from pin 1 to pin 2, this is referred to as forward rotation. This direction of rotation is indicated on the output by a tW(FWD) pulse width. For the –R variant, forward direction is indicated for target rotation from pin 2 to 1 (see Figure 4). REVERSE ROTATION For the –F variant, when the target is rotating such that a target feature passes from pin 2 to pin 1, this is referred to as reverse rotation. This direction of rotation is indicated on the output by a tW(REV) pulse width. For the –R variant, reverse direction is indicated for target rotation from pin 1 to 2. Output edges are triggered by VPROC transitions through the switchpoints. On a crossing, the output is first set to ICC(LOW) for a duration of tw(PRE), after which the output pulse of ICC(HIGH) is present for tw(FWD) or tw(REV). The IC is always capable of properly detecting input signals up to the defined operating frequency. However, the end user will note that a sequence of tw(PRE) and tw(REV) does meet this frequency. The tw(PRE) period is dominant, thus always providing rising output edge, but, at high frequencies, potentially truncating the ICC(HIGH) duration. Figure 4: Target Orientation Relative to Device (ring magnet shown). N N N S N S S S N N N S N S S S Rotation from pin 1 to pin 2 Pin 1 Pin 2 Branded Face of Package Rotatin (Ring magnet or ferromagnetic) (Ring magnet or ferromagnetic) g Target Rotation from pin 2 to pin 1 Pin 1 Pin 2 Branded Face of Package Rotating Target Figure 5: Output Timing Example S N t w(FWD) t w(FWD) t w(Pre) t w(Pre) I CC(LOW) I CC(HIGH) |
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