ATS17501 datasheet(20/23 Pages) ALLEGRO

20 / 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

Diagnostics and Fault Reporting

The ATS17501 contains diagnostics monitors of analog and

digital circuits of the IC. These continuously monitor and report

if any defect, calculation error, or invalid input stimulus is found.

If a diagnostic monitor fires, the outputs of the ATS17501 will

transition to a VFAULT level. For all faults, the outputs will remain

at the VFAULT level for enough time to allow the system control-

ler to monitor that a fault has occurred. For some diagnostics, it

is possible to clear the fault with a reset of the internal controller

of the sensor IC. If any of those diagnostic monitors triggers the

fault event, the ATS17501 will automatically perform a reset of

the internal controller after the output is held VFAULT for enough

time to allow the system controller to monitor the fault event.

For diagnostics and fault reporting to perform correctly, proper

programming and adherence to the specifications and assump-

tions stated in this datasheet, the ATS17501 Safety Manual, and

any other addendum, corrigendum, and application note that

applies to the ATS17501. For more information on diagnostics

and fault reporting, see the ATS17501 Safety Manual.

Recalibration

Under large amplitude vibration conditions at startup, the peak-

to-peak and phase relationship of the magnetic input signals can

meet the conditions to calibrate. Once normal rotation resumes,

the actual signal amplitudes can be much larger than the peak

signals acquired during calibration. Rather than wait several

TCYCLE events for the peak signal to be tracked to actual levels,

the ATS17501 will detect the difference and recalibrate on the

new signal. Recalibration allows for fast and robust correction

from cases of calibration on vibration events.

Pulse Collision Prevention

In cases of “high-speed” vibration, output transitions can occur

at very high frequencies, to prevent pulse collision (truncation of

the pulse width), the ATS17501 will prevent output transitions

until the current output pulse transition is complete to ensure

the system controller can accurately interpret the output signal.

This feature is only implemented when a pulse protocol option is

selected.

High Configurability

The ATS17501 contains programmable parameters, as shown in

the Selection Guide, that can be configured to provide applica-

tion-level optimization.

Advance Information Datasheet

Subject to Change Without Notice

March 19, 2020

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