Large Air Gap, GMR Transmission

Speed Sensor IC for Gear Tooth Sensing

ATS19480

4

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Typ. [1]

Max.

Unit

ELECTRICAL SUPPLY CHARACTERISTICS

Supply Voltage [2]

VCC

Voltage across pin 1 and pin 3; does not include

voltage across RL

4

–

24

V

Undervoltage Lockout

VCC(UV)

–

–

3.95

V

Reverse Supply Current [3]

IRCC

VCC = –18 V

–10

–

–

mA

Supply Current

ICC(LOW) Low-current state

5.9

–

8

mA

ICC(HIGH) High-current state

12

–

16

mA

Supply Current Ratio

ICC(HIGH) /

ICC(LOW)

Ratio of high current to low current (isothermal)

1.9

–

–

–

ASIL Safety Current

IFAULT

VCC ≤ 14 V, -A (ASIL) variant

1.5

–

3.9

mA

ELECTRICAL PROTECTION CHARACTERISTICS

Supply Zener Clamp Voltage

VZsupply ICC = 19 mA

28

–

–

V

Reverse Supply Zener Clamp Voltage VRZSUPPLY ICC = –3 mA

–

–

–18

V

POWER-ON STATE CHARACTERISTICS

Power-On State

POS

VCC > VCC(min)

ICC(LOW)

–

Power-On Time

tPO

Time from VCC > VCC(min), until device has

entered Calibration mode

–

–

1

ms

OUTPUT CHARACTERISTICS

Output Rise Time

tr

Voltage measured at pin 3

(see Typical Application Circuit),

RL = 100 Ω, CL = 10 pF, measured between 10%

and 90% of signal

0

2

4

μs

Output Fall Time

tr

Voltage measured at pin 3

(see Typical Application Circuit),

RL = 100 Ω, CL = 10 pF, measured between 10%

and 90% of signal

0

2

4

μs

Pulse Width, Fault

tw(FAULT)

RL = 100 Ω, CL = 10 pF, pulse duration measured

at threshold of (ICC(LOW) + IFAULT) / 2 ; -A (ASIL)

variant

4

–

8

ms

Operating Frequency

fOP

0

–

12

kHz

Operational Air Gap Range [4]

AG

Using Reference Target 60-0, tested at 1000 rpm

1.5

–

4.5

mm

Extended Air Gap Range

AGEXT

Using Reference Target 60-0.

Output duty cycle may be degraded.

0.5

–

1.5

mm

Total Air Gap Variation During

Operation

Momentary interruptions in output sequence

permitted; operation within AG range

–4

–

4

mm

Operate Point

BOP

Percentage of IC processed magnetic signals;

see Figure 3

–

70

–

%

Release Point

BRP

Percentage of IC processed magnetic signals;

see Figure 3

–

30

–

%

OPERATING CHARACTERISTICS: Valid throughout full operating and temperature ranges, unless otherwise specified

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