ATS692LSH datasheet(8/12 Pages) ALLEGRO

8 / 12 page

Two-Wire, Differential, Vibration Resistant

Sensor IC with Speed and Direction Output

ATS692LSH(RSNPH)

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Timing

As shown in figure 4, the pulse appears at the output

slightly before the sensed magnetic edge traverses the package

branded face. For targets in forward rotation, this shift, Δfwd,

results in the pulse corresponding to the valley with the sensed

mechanical edge, and for targets in reverse rotation, the shift,

Δrev, results in the pulse corresponding to the tooth with the

sensed edge. The sensed mechanical edge that stimulates output

pulses is kept the same for both forward and reverse rotation by

using only one channel to control output switching.

Direction Validation

Following a direction change in running mode, output pulses

have a width of tw(ND) until direction information is validated.

An example of the waveforms is shown in figure 5.

∆rev

tw(REV) 90 μs

Reverse Rotation

Forward Rotation

Output Pulse

(Forward Rotation)

Output Pulse

(Reverse Rotation)

Tooth

Valley

∆fwd

tw(FWD) 45 μs

Figure 4. Output protocol

Figure 5. Example of direction change in Running mode

Target

Differential

Magnetic

Profile

Target Rotation Forward

Target Rotation Reverse

tW(FWD)

tW(ND)

tW(REV)

tW(FWD)

IOUT

Tooth

Valley

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