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A1318 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A1318 Datasheet(HTML) 6 Page - Allegro MicroSystems |
6 / 12 page Linear Hall-Effect Sensor ICs with Analog Output Available in a Miniature, Low Profile Surface Mount Package A1318 and A1319 6 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Characteristic Definitions Power On Time When the supply is ramped to its operating voltage, the device output requires a finite time to react to an input magnetic field. Power On Time, tPO , is defined as the time it takes for the output voltage to begin responding to an applied magnetic field after the power supply has reached its minimum specified operating voltage, VCC(min), as shown in figure 1. Delay to Clamp A large magnetic input step may cause the clamp to overshoot its steady state value. The Delay to Clamp, tCLP, is defined as the time it takes for the output voltage to settle within 1% of its steady state value, after initially passing through its steady state voltage, as shown in figure 2. Quiescent Voltage Output In the quiescent state (no signifi- cant magnetic field: B = 0 G), the output, VOUT(Q), is at a con- stant ratio to the supply voltage, VCC, across the entire operating ranges of VCC and Operating Ambient Temperature, TA. Quiescent Voltage Output Drift Across Temperature Range Due to internal component tolerances and thermal considerations, the Quiescent Voltage Output, VOUT(Q), may drift due to temperature changes within the Operating Ambient Temperature, TA. For purposes of specification, the Quiescent Voltage Output Drift Across Temperature Range, ∆V OUT(Q) (mV), is defined as: ∆V OUT(Q) VOUT(Q)(TA) –VOUT(Q)(25°C) = (1) Sensitivity The amount of the output voltage change is propor- tional to the magnitude and polarity of the magnetic field applied. This proportionality is specified as the magnetic sensitivity, Sens (mV/G), of the device and is defined as: VOUT(B+) – VOUT(B–) (B+) – (B–) Sens = (2) where B+ is the magnetic flux density in a positive field (south polarity) and B– is the magnetic flux density in a negative field (north polarity). Sensitivity Temperature Coefficient The device sensitivity changes as temperature changes, with respect to its Sensitivity Temperature Coefficient, TCSENS. TCSENS is programmed at 150°C, and calculated relative to the baseline sensitivity program- ming temperature of 25°C. TCSENS is defined as: SensT2 – SensT1 SensT1 T2–T1 1 TCSens = ×100 (%/°C) (3) where T1 is the baseline Sens programming temperature of 25°C, and T2 is the TCSENS programming temperature of 150°C. The ideal value of Sens across the full ambient temperature range, SensIDEAL(TA), is defined as: SensT1 × [100 (%) + TCSENS (TA –T1)] SensIDEAL(TA) = (4) Sensitivity Drift Across Temperature Range Second order sensitivity temperature coefficient effects cause the magnetic sensitivity, Sens, to drift from its ideal value across the operating ambient temperature range, TA. For purposes of specification, V +t VCC VCC(min) VOUT 90% VOUT 0 t1= time at which power supply reaches minimum specified operating voltage t2= time at which output voltage settles within ±10% of its steady state value under an applied magnetic field t1 t2 tPO VCC(typ) time (µs) Magnetic Input Signal t1= time at which output voltage initially reaches steady state clamp voltage t2= time at which output voltage settles to within 1% of steady state clamp voltage VCLPHIGH t1 t2 tCLP VOUT Figure 1. Definition of Power On Time, tPO Figure 2. Definition of Delay to Clamp, tCLP |
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