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A1365LKTTN-2-T Datasheet(PDF) 15 Page - Allegro MicroSystems |
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A1365LKTTN-2-T Datasheet(HTML) 15 Page - Allegro MicroSystems |
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15 / 32 page 
Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator A1365 15 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com VOUT(Q)EXPECTED(TA) should be calculated using the actual measured values of VOUT(Q)T1 and TCQVO rather than program- ming target values. Quiescent Voltage Output Drift Through Tem- perature Range (ΔVOUT(Q)TC) Due to internal component tolerances and thermal considerations, the Quiescent Voltage Output (VOUT(Q)) may drift from its nominal value through the operating ambient temperature (TA). The Quiescent Voltage Output Drift Through Temperature Range (ΔVOUT(Q)TC) is defined as: DVOUT(Q)TC = VOUT(Q)(TA) – VOUT(Q)EXPECTED(TA) (5) ∆VOUT(Q)TC should be calculated using the actual measured values of ∆VOUT(Q)(TA) and ∆VOUT(Q)EXPECTED(TA) rather than programming target values. Sensitivity (Sens) The presence of a south polarity magnetic field, perpendicular to the branded surface of the package face, increases the output voltage from its quiescent value toward the supply voltage rail. 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: Sens = , V– V OUT(BPOS) OUT(BNEG) BPOS – BNEG (6) where BPOS and BNEG are two magnetic fields with opposite polarities. Initial Unprogrammed Sensitivity (Sensinit ) Before any programming, Sensitivity has a nominal value that depends on the SENS_COARSE bits setting. Each A1365 variant has a different SENS_COARSE setting. Sensitivity Programming Range (SensPR) The magnetic sensitivity (Sens) can be programmed around its initial value within the sensitivity range limits: SensPR(min) and SensPR(max). Exceeding the specified Sensitivity Range will cause Sensitivity Drift Through Temperature Range ΔSensTC to deteriorate beyond the specified values. Refer to the Quiescent Voltage Output Range section for a conceptual explanation of how value distributions and ranges are related. Average Fine Sensitivity Programming Step Size (StepSENS) Refer to the Average Quiescent Voltage Output Programming Step Size section for a conceptual explanation. Sensitivity Programming Resolution (ErrPGSENS) Refer to the Quiescent Voltage Output Programming Resolution section for a conceptual explanation. Sensitivity Temperature Coefficient (TCSENS) Device sensitivity changes as temperature changes, with respect to its programmed sensitivity temperature coefficient, TCSENS. TCSENS is programmed at 150°C, and calculated relative to the nominal sensitivity programming temperature of 25°C. TCSENS (%/°C) is defined as: TC SENS = × 100% , Sens – Sens T2 T1 Sens T1 T2–T1 1 (7) where T1 is the nominal Sens programming temperature of 25°C, and T2 is the TCSENS programming temperature of 150°C. The expected value of Sens over the full ambient temperature range, SensEXPECTED(TA), is defined as: Sens Sens EXPECTED(TA)T1 = × TC (T –T1) SENS A 100 100% + (8) SensEXPECTED(TA) should be calculated using the actual measured values of SensT1 rather than programming target values. Mold Ejector Pin Indent Branded Face Magnetic Flux Direction Causing the Output to Increase Figure 6: Magnetic Flux Polarity |
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