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A1356LKB-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1356LKB-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
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9 / 20 page  High Precision Linear Hall-Effect Sensor IC With an Open Drain Pulse Width Modulated Output A1356 9 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Quiescent Duty Cycle Output Programming Resolution The programming resolution for any device is half of its pro- gramming step size. Therefore, the typical programming resolu- tion will be: ErrPGD(Q)(typ) = 0.5 × StepD(Q)(typ) . (2) Quiescent Duty Cycle Output Drift through Tempera- ture Range Due to internal component tolerances and thermal considerations, the quiescent Duty Cycle Temperature Coeffi- cient, DTC(Q), may drift from its nominal value over the operat- ing ambient temperature, TA. For purposes of specification, the Quiescent Duty Cycle Output Drift Through Temperature Range, ∆D(Q) (% D), is defined as: D(Q)(TA) – D(Q)(25°C) ∆D(Q) = , (3) where D(Q)(TA) is the quiescent duty cycle measured at TA and is D(Q)(25°C) quiescent duty cycle measured at 25°C. Sensitivity The presence of a south polarity magnetic field, perpendicular to the branded surface of the package face, increases the output duty cycle from its quiescent value toward the maximum duty cycle limit. The amount of the output duty cycle increase is proportional to the magnitude of the magnetic field applied. Conversely, the application of a north polarity field decreases the output duty cycle from its quiescent value. This proportionality is specified as the magnetic sensitivity, Sens ((% D)/G), of the device, and it is defined for bipolar devices as: D(BPOS) – D(BNEG) BPOS – BNEG Sens = , (4) and for unipolar devices as: D(BPOS) – D(Q) BPOS Sens = , (5) where BPOS and BNEG are two magnetic fields with opposite polarities. Guaranteed Sensitivity Range The magnetic sensitivity, Sens, can be programmed around its nominal value within the sensitivity range limits: Sens(min) and Sens(max). Refer to the Guaranteed Quiescent Duty Cycle Output Range section for a conceptual explanation of how value distributions and ranges are related. Average Sensitivity Step Size Refer to the Average Qui- escent Duty Cycle Output Step Size section for a conceptual explanation. Sensitivity Programming Resolution Refer to the Quies- cent Duty Cycle Output Programming Resolution section for a conceptual explanation. Carrier Frequency Target The PWM output signal Carrier Frequency Programming Range, fPWM, can be programmed to its nominal value of 2 kHz. Average Carrier Frequency Step Size Refer to the Average Quiescent Duty Cycle Output Step Size section for a conceptual explanation. Carrier Frequency Programming Resolution Refer to the Quiescent Duty Cycle Output Programming Resolution section for a conceptual explanation. Sensitivity Temperature Coefficient Device sensitivity changes as temperature changes, with respect to its programmed sensitivity temperature coefficient, SENSTC. SENSTC is pro- grammed at 150°C, and calculated relative to the nominal sensitivity programming temperature of 25°C. SENSTC (%/°C) is defined as: SensT2 – SensT1 SensT1 T2–T1 1 SensTC = ×100% , (6) where T1 is the nominal Sens programming temperature of 25°C, and T2 is the programming temperature of 150°C. The expected value of Sens over the full ambient temperature range, SensEXPECTED(TA), is defined as: SensT1× [100% +SensTC (TA –T1)] SensEXPECTED(TA) = . 100 % (7) SensEXPECTED (TA) should be calculated using the actual measured values of SensT1 and SENSTC rather than programming target values. Sensitivity Drift Through Temperature Range Sec- ond order sensitivity temperature coefficient effects cause the magnetic sensitivity, Sens, to drift from its expected value over the operating ambient temperature range, TA. For purposes of specification, the Sensitivity Drift Through Temperature Range, ∆SensTC, is defined as: SensTA – SensEXPECTED(TA) SensEXPECTED(TA) ∆SensTC = ×100% . (8) Sensitivity Drift Due to Package Hysteresis Package stress and relaxation can cause the device sensitivity at TA = 25°C to change during and after temperature cycling. |
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