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A1302KLHLT-T Datasheet(PDF) 5 Page - Allegro MicroSystems |
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A1302KLHLT-T Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 10 page Continuous-Time Ratiometric Linear Hall Effect Sensor ICs A1301 and A1302 4 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com CHARACTERISTIC DEFINITIONS Quiescent Output Voltage In the quiescent state (no significant magnetic field: B = 0), the output, VOUTQ, equals one half of the supply voltage, VCC, throughout the entire operating ranges of VCC and ambient temperature, TA. Due to internal component tolerances and ther- mal considerations, there is a tolerance on the quiescent output voltage, ∆VOUTQ, which is a function of both ∆VCC and ∆TA. For purposes of specification, the quiescent output voltage as a func- tion of temperature, ∆VOUTQ(∆T A), is defined as: where Sens is in mV/G, and the result is the device equivalent accuracy, in gauss (G), applicable over the entire operating tem- perature range. Sensitivity The presence of a south-polarity (+B) magnetic field, perpen- dicular to the branded face of the device package, increases the output voltage, VOUT, in proportion to the magnetic field applied, from VOUTQ toward the VCC rail. Conversely, the application of a north polarity (–B) magnetic field, in the same orientation, proportionally decreases the output voltage from its quiescent value. This proportionality is specified as the magnetic sensitiv- ity of the device and is defined as: The stability of the device magnetic sensitivity as a function of ambient temperature, ∆Sens(∆T A) (%) is defined as: Ratiometric The A1301 and A1302 feature a ratiometric output. This means that the quiescent voltage output, VOUTQ, and the magnetic sen- sitivity, Sens, are proportional to the supply voltage, VCC. The ratiometric change (%) in the quiescent voltage output is defined as: and the ratiometric change (%) in sensitivity is defined as: Linearity and Symmetry The on-chip output stage is designed to provide linear output at a supply voltage of 5 V. Although the application of very high magnetic fields does not damage these devices, it does force their output into a nonlinear region. Linearity in percent is mea- sured and defined as: and output symmetry as: ∆ VOUTQ(∆Τ Α) Sens(25ºC) VOUTQ(Τ Α) VOUTQ(25ºC) – = (1) 2 B VOUT(–B) VOUT(+B) Sens – = ∆ Sens(∆Τ Α) Sens(Τ Α) Sens(25ºC) Sens(25ºC) – = × 100% (2) (3) VCC 5 V VOUTQ(VCC) VOUTQ(5V) ∆ VOUTQ(∆V) = × 100% (4) VCC 5 V = × 100% ∆ Sens(∆V) Sens(VCC) Sens(5V) (5) = × 100% Lin+ 2 ( VOUT(+B½) – VVOUTQ ) – VOUT(+B) VOUTQ (6) = × 100% Lin– 2( VOUT(–B½) – VOUTQ) – VOUT(–B) VOUTQ (7) – = × 100% Sym VOUT(+B) VOUTQ – VOUT(–B) VOUTQ (8) |
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