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A1203EUA-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1203EUA-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 13 page 9 A1201-DS, Rev. 2 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Continuous-Time Bipolar Switch Family A1201, A1202, A1203, and A1204 the field is reduced beyond the BOP level, the device switches back to the low state. The typical output behavior of the A120x devices is latching. That is, switching to the low state when the magnetic field at the Hall sensor exceeds the operate point threshold, BOP. At this point, the output voltage is VOUT(SAT). When the magnetic field is reduced to below the release point threshold, BRP, the device output, VOUT, goes high. The values of the magnetic parameters are specified in the Magnetic Characteristics table, on page 3. Note that, as shown in figure 1, these switchpoints can lie in either north or south polarity ranges. The A120x family is designed to attain a small hysteresis, and thereby provide more sensitive switching. Although this means that true latching behavior cannot be guaranteed in all cases, proper switching can be ensured by use of both south and north magnetic fields, as in a ring magnet. The hysteresis of the A120x family allows clean switching of the output, even in the presence of external mechanical vibration and electrical noise. Bipolar devices adopt an indeterminate output state when pow- ered-on in the absence of a magnetic field or in a field that lies within the hysteresis band of the device. For more information on Bipolar switches, refer to Application Note 27705, Understanding Bipolar Hall Effect Sensors. CONTINUOUS-TIME BENEFITS Continuous-time devices, such as the A120x family, offer the fastest available power-on settling time and frequency response. Due to offsets generated during the IC packaging process, continuous-time devices typically require programming after packaging to tighten magnetic parameter distributions. In con- trast, chopper-stabilized switches employ an offset cancellation technique on the chip that eliminates these offsets without the need for after-packaging programming. The tradeoff is a longer settling time and reduced frequency response as a result of the chopper-stabilization offset cancellation algorithm. Figure 2. Continuous-Time Application, B < BRP.. This figure illustrates the use of a quick cycle for chopping VCC in order to conserve battery power. Position 1, power is applied to the device. Position 2, the output assumes the correct state at a time prior to the maximum Power-On Time, tPO(max). The case shown is where the correct output state is HIGH. Position 3, tPO(max) has elapsed. The device output is valid. Position 4, after the output is valid, a control unit reads the output. Position 5, power is removed from the device. VCC VOUT Output Sampled 1 5 4 2 t t tPO(max) 3 |
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