ATS657 Просмотр технического описания (PDF) - Allegro MicroSystems

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ATS657

Dynamic, Self-Calibrating, Threshold-Detecting, Differential Speed and Direction Hall-Effect Gear Tooth Sensor IC

Allegro MicroSystems 

ATS657

Dynamic, Self-Calibrating, Threshold-Detecting, Differential

Speed and Direction Hall-Effect Gear Tooth Sensor IC

Operation During Running Mode Vibration

During normal running mode, vibration can interfere with the

direction detection functions. In that case, during the vibration the

device may continue to output speed data with non-directional

pulses.

If the vibration that occurs has a large enough amplitude such

that the peaks of the VPROC signals continue to pass through both

switchpoints, non-direction pulses will be outputted during the

vibration, as shown in figure 5.

If the vibration has a low enough amplitude such that its posi-

tive peak is less than VPROC(BOP) , no pulses are outputted and

no switchpoint updating occurs until the vibration becomes large

enough that VPROC exceeds VPROC(BOP) . If its negative peak is

greater than VPROC(BRP), then there is no output or update until

VPROC falls below VPROC(BRP) . As shown in figure 6, when that

does occur, a single direction pulse may be outputted, however,

regardless of whether or not that single pulse occurs, non-direction

pulses are outputted throughout the remainder of the vibration.

Normal Rotation

+V

Vibration

VPROC(BOP)

VPROC(BRP)

} Switchpoint

Hysteresis

+I

tw(FWD) or tw(REV)

+t

tw(ND)

+t

Figure 5. Large amplitude vibration during Running mode operation

+V

VPROC(BOP)

VPROC(BRP)

Normal Rotation

Vibration

VPROC > VPROC(BOP)

} Switchpoint

Hysteresis

+I

tw(FWD) or tw(REV)

tw(FWD)

or tw(REV)

Figure 6. Small amplitude vibration during Running mode operation

+t

tw(ND)

+t

Allegro MicroSystems, Inc.

10

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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