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A1381LLHLT-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1381LLHLT-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 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 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com For purposes of specification, the sensitivity drift due to package hysteresis, ∆SensPKG, is defined as: Sens (25°C)2 – Sens(25°C)1 Sens (25°C)1 ∆Sens PKG = ×100% , (8) where Sens(25°C)1 is the programmed value of sensitivity at TA = 25°C, and Sens(25°C)2 is the value of sensitivity at TA = 25°C, after temperature cycling TA up to 150°C, down to –40°C, and back to up 25°C. Linearity Sensitivity Error The 138x family is designed to provide a linear output in response to a ramping applied magnetic field. Consider two magnetic fields, B1 and B2. Ideally, the sen- sitivity of a device is the same for both fields, for a given supply voltage and temperature. Linearity error is present when there is a difference between the sensitivities measured at B1 and B2. Linearity Error is calculated separately for the positive (LinERRPOS) and negative (LinERRNEG) applied magnetic fields. Linearity error (%) is measured and defined as: Sens BPOS2 Sens BPOS1 Sens BNEG2 Sens BNEG1 1– Lin ERRPOS = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ 1– Lin ERRNEG = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (9) where: |V OUT(Bx) – VOUT(Q)| Bx Sens Bx = , (10) and BPOSx and BNEGx are positive and negative magnetic fields, with respect to the quiescent voltage output such that |BPOS2| > |BPOS1| and |BNEG2| > |BNEG1|. Then: Lin ERR max( |LinERRPOS | , |LinERRNEG | ) = . (11) Symmetry Sensitivity Error The magnetic sensitivity of an A138x device is constant for any two applied magnetic fields of equal magnitude and opposite polarities. Symmetry error, SymERR (%), is measured and defined as: Sens BPOS Sens BNEG 1– Sym ERR = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (12) where SensBx is as defined in equation 10, and BPOS and BNEG are positive and negative magnetic fields such that |BPOS| = |BNEG|. Ratiometry Error The A138x devices feature ratiometric output. This means that the quiescent voltage output, VOUT(Q), magnetic sensitivity, Sens, and clamp voltage, VCLP(HIGH) and VCLP(LOW), are proportional to the supply voltage, VCC. In other words, when the supply voltage increases or decreases by a certain percent- age, each characteristic also increases or decreases by the same percentage. Error is the difference between the measured change in the supply voltage relative to 5 V, and the measured change in each characteristic. The ratiometric error in quiescent voltage output, RatERRVOUT(Q) (%), for a given supply voltage, VCC, is defined as: V OUT(Q)(VCC) / VOUT(Q)(5V) V CC / 5 V 1– Rat ERRVOUT(Q) = ×100% . ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (13) The ratiometric error in magnetic sensitivity, RatERRSens (%), for a given supply voltage, VCC, is defined as: Sens (VCC) / Sens(5V) V CC / 5 V 1– Rat ERRSens = ×100% . ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (14) The ratiometric error in the clamp voltages, RatERRCLP (%), for a given supply voltage, VCC, is defined as: V CLP(VCC) / VCLP(5V) V CC / 5 V 1– Rat ERRCLP = ×100% . ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (15) where VCLP is either VCLP(HIGH) or VCLP(LOW). |
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