High-Accuracy, Pulse-Width or AK Protocol

Hall-Effect Wheel Speed and Direction Sensor IC

A19302

5

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Typ.[1]

Max.

Unit

OUTPUT PROTOCOL CHARACTERISTICS [8] (-xAx variant)

Bit Width

tp

Refer to Figure 8

40

50

60

µs

Standstill Period

tSTOP

105

150

195

ms

AK Off Time

tW(PRE)

Pre-low time

–

75

–

µs

Pulse Width, ASIL Fault

tW(FAULT)

Refer to Figure 13

5

–

–

ms

Air Gap Reserve Level

BLR

Signal amplitude that engages AK LR bit

–

24

–

Gpk-pk

Operating Frequency

fSIG

0

–

2.5

kHz

OUTPUT PROTOCOL CHARACTERISTICS [8] (-xBx variant)

Pulse Width Off Time

tW(PRE)

Refer to Figure 8

38

45

52

µs

Forward Pulse Width

tW(FWD)

76

90

104

µs

Reverse Pulse Width

tW(REV)

153

180

207

µs

Pulse Width, ASIL Fault

tW(FAULT)

Refer to Figure 13

5

–

–

ms

Operating Frequency,

Forward Pulses [9]

fFWD

0

–

3.9

kHz

Operating Frequency,

Reverse Pulses [9]

fREV

0

–

2.4

kHz

OUTPUT PROTOCOL CHARACTERISTICS [8] (-xPx variant)

Pulse Width Off Time

tW(PRE)

Refer to Figure 9

38

45

52

µs

Forward Pulse Width

tW(FWD)

76

90

104

µs

Reverse Pulse Width

tW(REV)

153

180

207

µs

EA Forward Pulse Width

tW(EA FWD)

306

360

414

µs

EA Reverse Pulse Width

tW(EA REV)

612

720

828

µs

Warning Pulse Width

tW(WARN)

38

45

52

µs

Standstill Pulse Width

tW(STILL)

1232

1440

1656

µs

Standstill Period

tSTOP

590

737

848

ms

Pulse Width, ASIL Fault

tw(FAULT)

Refer to Figure 14

5

–

–

ms

Operating Frequency,

Forward Pulses [9]

fFWD

0

–

3.9

kHz

Operating Frequency,

Reverse Pulses [9]

fREV

0

–

2.4

kHz

Operating Frequency,

Warning Pulses

fWARN

0

–

5

kHz

Operating Frequency,

EA Pulses

fEA

EA pulses output when f < fEA and BDIFF(pk-pk) < BEA

–

117

–

Hz

Air Gap Warning Level

BWARN

Warning pulses output when BDIFF(pk-pk) < BWARN

–

24

–

Gpk-pk

Extended Air Gap Level

BEA

EA pulses output when f < fEA and BDIFF(pk-pk) < BEA

–

84

–

Gpk-pk

OPERATING CHARACTERISTICS (continued): Valid over operating voltage and temperature, unless otherwise specified

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