A17201LUAA-I1 查看數據表（PDF） - Allegro MicroSystems

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A17201LUAA-I1

Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter Capacitor

Allegro MicroSystems 

A17201

Two-Wire AC-Coupled Differential Sensor IC

with Integrated Filter Capacitor

APPLICATIONS INFORMATION

The A17201 is a versatile high-precision differential sensor IC

that can be used in a wide range of applications. Proper choice

of the target material and shape, magnet material and shape, and

assembly techniques enables large working air gaps and high

switchpoint accuracy over the device operating temperature

range.

Device Operation

The A17201 contains two integrated Hall transducers that are

used to differentially respond to a magnetic field across the

surface of the IC. As shown in Figure 2, the trigger switches

the output signal ICC high when the differential magnetic field

crosses the BOP level while increasing in strength (referred to as

the positive direction) and switches the output signal, ICC low

when the differential magnetic field crosses BRP while decreasing

(the negative direction).

Start-Up

During power-on time, tPO, the output signal, ICC is high. Beyond

this time, if the applied magnetic field, Bdiff, is smaller than

BHYS, the switching state and output polarity are indeterminate.

ICC will be valid for Bdiff > BHYS, after the additional settling

time, tSETTLING, has also elapsed.

Delay

The bandpass filter induces delay in the output signal, ICC, rela-

tive to the applied magnetic field, Bdiff. Simulation data shown

in the Characteristic Data section quantify the effect of the input

signal amplitude on the phase shift of the output. Positive values

of delay indicate a lagging output, while negative values indicate

a leading output.

Applied Magnetic BOP

Field, Bdiff BRP

Output Signal, ICC

ICC(HIGH)

ICC(LOW)

Figure 2: Typical Output Characteristic

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Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

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