High-Accuracy, Pulse-Width or AK Protocol

Hall-Effect Wheel Speed and Direction Sensor IC

A19302

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

Potential between

pin 1 and pin 2

-xBx and -xPx variants

4

–

24

V

-xAx variant

5.2

–

24

V

UVLO Hysteresis

VHYS(AK)

-xAx variant

1.1

–

–

V

Reverse Supply Current [3]

IRCC

VCC = VRCC(max)

–10

–

–

mA

Supply Zener Clamp Voltage

VZsupply

ICC = 36.6 mA

28

–

–

V

Supply Current

ICC(LOW)

Low-current state

5.9

7

8.4

mA

ICC(MID)

Mid-current state

12

14

16

mA

ICC(HIGH)

High-current state

23.52

28.0

33.6

mA

Supply Current Ratio [4]

ICC(MID) /

ICC(LOW)

Measured as ratio of mid current to low current

(isothermal)

1.9

–

–

–

ICC(HIGH) /

ICC(LOW)

Measured as ratio of high current to low current

(isothermal)

3.6

–

–

–

ASIL Safety Current

IFAULT

Refer to Figure 14

1.5

3.5

3.9

mA

Output Rise/Fall Time

tr, tf

Voltage measured at pin 2 in Figure 2;

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

10% and 90% of ICC(LOW) and ICC(MID)

(-xBx and -xPx variants)

0

–

1.5

μs

Slew Rate

SR

Measured at pin 2 in Figure 2; RL = 50 Ω,

CL = 10 pF, measured between 10% and 90%

of ICC(LOW) and ICC(HIGH) or ICC(LOW) and ICC(MID)

(-xAx variant)

8

–

28

mA/µs

Overtemperature Threshold

TJF

Junction temperature that sets AK OT bit

(-xAx variant)

–

175

–

°C

Overtemperature Hysteresis

TJHYS

Junction overtemperature threshold hysteresis

(-xAx variant)

–

15

–

°C

POWER-ON CHARACTERISTICS

Power-On State

POS

VCC > VCC(min), as connected in Figure 2

ICC(LOW)

mA

Power-On Time [5]

tPO

VCC > VCC(min), as connected in Figure 2

–

0.25

1

ms

OPERATING CHARACTERISTICS AND PERFORMANCE

Operating Differential Magnetic Input [6] BDIFF(pk-pk)

Peak-to-peak of differential magnetic input

(TA = 160°C)

20

–

–

G

Operating Differential Magnetic Range[6]

BDIFF

Refer to Figure 6

–700

–

700

G

Operating Magnetic Input

Signal Variation

∆BDIFF(pk-pk)

Bounded amplitude ratio within TWINDOW [7];

no missed output transitions or flat line condition;

possible incorrect direction information;

see Figure 4 and Figure 5

0.4

–

–

–

Operating Magnetic Input

Signal Window

TWINDOW

Rolling window where ∆BDIFF(pk-pk) cannot exceed

bounded ratio; see Figure 4 and Figure 5

4

–

–

TCYCLE

Calibration Period

TCAL

Period between power-on and valid speed and

correct direction output (f ≤ 200 Hz)

–

–

1.5

TCYCLE

Operate Point

BOP

% of peak-to-peak IC-processed signal

–

60

–

%

Release Point

BRP

% of peak-to-peak IC-processed signal

–

40

–

%

Switch Point Separation

BDIFF(SP-SEP)

Required amount of amplitude separation between

channelAand channel B at each BOP and BRP

occurrence. Channels must be in phase; see Figure 7

20

–

–

%

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

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