ATS601LSG datasheet(4/14 Pages) ALLEGRO

4 / 14 page

Single Element, Tooth Detecting Speed Sensor IC

ATS601

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Operating Mode Characteristics

Output Polarity

VOUT

LT option

Opposite target tooth, connected as

in figure 1

–

Low

–

HT option

–

High

–

Startup Hysteresis

BHYS(su)

N option

Amount of signal movement needed

to generate first output edge

–40–

W option

–

Threshold Update Memory

–

1 option

Number of target teeth (peaks)

stored in memory for threshold

update algorithm

–

tooth

4 option

–

tooth

Running Mode Switchpoint

BST

U option

% of peak-to-peak, referenced to

tooth signal, see figure 4

M option

Running Mode Internal Hysteresis

BHYS(rm)

% of peak-to-peak signal

Stop Mode Timer Period

tSM

Timer interval to initiate Stop mode, no sensed

magnetic edges

–5–

Chopper Frequency

–

167

–

kHz

1Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.

21 G (gauss) = 0.1 mT (millitesla).

3Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.

4Between VCC(min) and VCC(UV) output switching continues to occur but device performance is not guaranteed.

5Power–On Time consists of the time from when VCC rises above VCC(min) until the earliest output edge is possible.

6Independent of output polarity option (HT or LT).

7Output Delay Time is the duration from when a crossing of the magnetic signal switchpoint, BST, occurs to when the electrical output signal, VOUT,

reaches 90% of VOUT(high).

8Reduced minimum air gap with N option due to potential for extra switching on first tooth due to magnetic overshoot larger than startup hysteresis,

characteristic of the Allegro 8X reference target. Device functions properly in Running mode down to 0.5 mm air gap.

OPERATING CHARACTERISTICS (continued) Valid using Allegro reference target 8X, and VCC and TA within specification; unless

otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.1

Max.

Unit2

Figure 3. Output Delay Time and Output Fall Time

90% VOUT

10% VOUT

VPROC(high)

BST

VOUT(high)

VPROC(low)

VOUT(low)

Time

Figure 4. Running Mode Switchpoint and Internal Hysteresis

VPROC(high)

VPROC(low)

BST

BHYS

Switchpoints

Target

Mechanical

Profile

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