ATS17501 datasheet(18/23 Pages) ALLEGRO

18 / 23 page

Dual Output Differential Speed and Direction Sensor IC

ATS17501

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

Fault Voltage

The ATS17501 communicates a fault condition by configuring

either output to hold within one of three VFAULT ranges (high,

mid, and low) for greater than 1 millisecond. Normal operation

allows for output transitions to occur over the VFAULT(MID) range;

as such, it is necessary to ignore fast transients for less than

1 millisecond through this range.

For internal diagnostics that trigger fault conditions (force the

output to go to VFAULT), both outputs will go to the VFAULT(HIGH)

range. As there may exist internal or external faults that cause

either or both output pins to hold a VFAULT(MID) or VFAULT(LOW)

level, these fault ranges should also be monitored. Examples of

these fault conditions could be a short circuit of the output to

ground, forcing the output to VFAULT(LOW), or a fault in the IC

output controller that forces the output to VFAULT(MID).

See Figure 12, Figure 13, and Figure 14 for examples of the out-

put communicating a fault condition.

Figure 12: Assumed Fault Example: High Fault

Figure 13: Assumed Fault Example: Mid Fault

Figure 14: Assumed Fault Example: Low Fault

VFAULT(HIGH,min)

VFAULT(MID,max)

VFAULT(MID,min)

>1 ms

Normal Opera�on

Assumed Fault

VFAULT(HIGH,min)

VFAULT(MID,max)

VFAULT(MID,min)

>1 ms

Normal Opera�on

Assumed Fault

VFAULT(HIGH,min)

VFAULT(MID,max)

VFAULT(MID,min)

>1 ms

Normal Opera�on

Assumed Fault

Advance Information Datasheet

Subject to Change Without Notice

March 19, 2020

ATS17501 Datasheet(PDF) 18 Page - Allegro MicroSystems

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