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A1369EUA-24-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1369EUA-24-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
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9 / 22 page  9 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Customer Programmable Linear Hall-Effect Sensor Optimized for Use in Current Sensing Applications A1369 The output voltage clamps, VCLP(HIGH) and VCLP(LOW), limit the operating magnetic range of the applied field in which the device provides a linear output. The maximum positive and negative applied magnetic fields in the operating range can be calculated: |B |– MAX(+) |B |– MAX(–) V– V CLP,HIGH OUT(Q) V– V OUT(Q) CLP,LOW Sens Sens Symmetry Sensitivity Error. The magnetic sensitivity of a device is constant for any two applied magnetic fields of equal magnitude and opposite polarities. Symmetry error, SymERR (%), is measured and defined as: Sym = ERR Sens (B+) Sens (B–) × 100% ( ) 1– where Sens = Bx |V –V | OUT(BX) OUT(Q) B x ( ) and B+, B- are positive and negative magnetic fields such that |B+| = |B-|. Ratiometry Error. The A1369 provides a 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, RatVOUT(Q) (%), for a given supply voltage, VCC, is defined as: RAT= ERRVOUT(Q) V/ V OUTO(VCC) OUTO(5 V) V /5 V CC × 100% ( ) 1– The ratiometric error in magnetic sensitivity, RatSens (%), for a given supply voltage, VCC, is defined as: RAT= ERRSens Sens / Sens (VCC) (5 V) V /5 V CC × 100% ( ) 1– The ratiometric error in the clamp voltages, RatVOUTCLP (%), for a given supply voltage, VCC, is defined as: RAT= VOUTCLP V/ V CLP(VCC) CLP(5 V) V /5 V CC × 100% ( ) 1– where VCLP is either VCLP(HIGH) or VCLP(LOW). Undervoltage Lockout. The A1369 features an undervoltage lockout feature that ensures that the device will output a valid sig- nal when VCC is above certain threshold VUVLOHI, and remains valid until VCC falls below a lower threshold, VUVLOLOW. The undervoltage lockout feature provides a hysteresis of operation to eliminate indeterminate output states. The output of the A1369 is held low (GND) until VCC exceeds VUVLOHI. Once VCC exceeds VUVLOHI, the device powers up, and the output will provide a ratiometric output voltage proportional to the input magnetic signal, and VCC. If VCC should drop back down below VUVLOLOW for more than tuvlo after the device is powered up, the output will be pulled low. V CC V UVLOHI V UVLOLOW V OUT Figure 4: UVLO Operation |
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