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A1383 Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1383 Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 18 page Programmable Linear Hall Effect Sensor ICs with Analog Output Available in a Miniature Thin Profile Surface Mount Package A1381, A1382, A1383, and A1384 8 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Quiescent Voltage Output Drift Through Temperature Range Due to internal component tolerances and thermal considerations, the quiescent voltage output, VOUT(Q), may drift from its nominal value over the operating ambient temperature, TA. For purposes of specification, the Quiescent Voltage Output Drift Through Temperature Range, ∆VOUT(Q) (mV), is defined as: ∆V OUT(Q) V OUT(Q)(TA) –VOUT(Q)(25°C) = . (3) Sensitivity The presence of a south polarity magnetic field, per- pendicular to the branded surface of the package face, increases the output voltage from its quiescent value toward the supply voltage rail (assuming that the polarity bit, POL, is in its initial state of logic 0). The amount of the output voltage increase is proportional to the magnitude of the magnetic field applied. Conversely, the application of a north polarity field decreases the output voltage from its quiescent value. This proportionality is specified as the magnetic sensitivity, Sens (mV/G), of the device, and it is defined as: V OUT(BPOS) – VOUT(BNEG) BPOS – BNEG Sens = , (4) 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, 2.5 to 7.5 mV/G depending on device type, within the sensitivity range limits: Sens(min) and Sens(max). Refer to the Guaranteed Quiescent Voltage Output Range section for a conceptual explanation of how value distributions and ranges are related. Average Sensitivity Step Size Refer to the Average Quiescent Voltage Output Step Size section for a conceptual explanation. Sensitivity Programming Resolution Refer to the Quiescent Voltage Output Programming Resolution section for a conceptual explanation. Sensitivity Temperature Coefficient Device sensitivity changes as temperature changes, with respect to its programmed sensitiv- ity temperature coefficient, TCSENS. TCSENS is programmed at 150°C, and calculated relative to the nominal sensitivity program ming temperature of 25°C. TCSENS (%/°C) is defined as: Sens T2 – SensT1 Sens T1 T2–T1 1 TC Sens = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (5) where T1 is the nominal Sens programming temperature of 25°C, and T2 is the TCSENS programming temperature of 150°C. The ideal value of Sens over the full ambient temperature range, SensIDEAL(TA), is defined as: Sens T1 [100% + TCSENS (TA –T1)] Sens IDEAL(TA) = (6) Guaranteed Sensitivity Temperature Coefficient Range The magnetic sensitivity temperature coefficient can be programmed within its limits: TCSens(max) and TCSens(min). Refer to the Guaranteed Quiescent Voltage Output Range section for a con- ceptual explanation of how value distributions and ranges are related. Average Sensitivity Temperature Coefficient Step Size Refer to the Average Quiescent Voltage Output Step Size section for a conceptual explanation. Sensitivity Temperature Coefficient Programming Resolution Refer to the Quiescent Voltage Output Programming Resolution section for a conceptual explanation. Sensitivity Drift Through Temperature Range Second order sensitivity temperature coefficient effects cause the magnetic sensitivity, Sens, to drift from its ideal value over the operating ambient temperature range, TA. For purposes of specification, the sensitivity drift through temperature range, ∆SensTC, is defined as: Sens TA – SensIDEAL(TA) Sens IDEAL(TA) ∆Sens TC = ×100% . (7) 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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