A19350LUBATN-RBE datasheet(5/14 Pages) ALLEGRO

5 / 14 page

High Accuracy GMR Wheel Speed and Direction Sensor IC

A19350

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Typ. [1]

Max.

Unit

INPUT CHARACTERISTICS AND PERFORMANCE

Operating Frequency,

Forward Rotation [8]

fFWD

–

3.9

kHz

Operating Frequency,

Reverse Rotation [8]

fREV

–

2.4

kHz

Operating Frequency,

Warning Pulses [8]

fWARN

–

6.4

kHz

Operating Differential Magnetic Input [9] BDIFF(pk-pk)

Peak-to-peak of differential magnetic input

(refer to Figure 6)

–

Peak-to-peak allowable for repeatability

(refer to Figure 6)

–

Operating Differential Magnetic Range [8]

BDIFF

Refer to Figure 6

–50

–

Allowable Differential Sequential

Signal Variation

BSEQ(n+1)/

BSEQ(n)

Signal period-to-period variation (refer to Figure 3)

–

200

BSEQ(n+i)/

BSEQ(n)

Overall signal variation (e.g. run-out) (refer to

Figure 3)

–

200

Operate Point

BOP

% of peak-to-peak IC-processed signal

–

Release Point

BRP

% of peak-to-peak IC-processed signal

–

Repeatability [10]

ErrθE

Constant air gap (greater than 20 G(pk-pk)),

temperature, and target speed. Sinusoidal input

signal. Greater than 1000 output edges captured.

–

0.3

Target Pitch

TPITCH

Arc length of each pole-pair (at 0 mm air gap)

1.4

–

Switch Point Separation

BDIFF(SP-SEP)

Required amount of amplitude separated

between channels at each BOP and BRP

occurrence. (refer to Figure 5)

–

%pk-pk

THERMAL CHARACTERISTICS

Magnetic Temperature Coefficient[11]

Valid for full temperature range based on ferrite

–

0.2

–

%/°C

Package Thermal Resistance

RθJA

Single-layer PCB with copper limited to solder pads

–

213

–

°C/W

OPERATING CHARACTERISTICS (continued): Valid throughout full operating voltage and temperature ranges,

unless otherwise specified

[8]

If a higher frequency operation is required, an option is available.

[9]

Differential magnetic field is measured for the Channel A (E1-E3) and Channel B (E2-E4). Each channel’s differential magnetic field is measured between two GMR elements spaced by

1.4 mm. Magnetic field is measured in the GMR element spacing orientation in the By direction (Refer to Figure 7). To maintain optimal performance, it is recommended that the |Bx|

field be less than 80 G.

[10]

Repeatability (i.e. jitter) is tested to 6 sigma and is guaranteed by design and characterization only.

[11]

Ring magnet decreases in magnetic strength with rising temperature, and the device compensates. Note that BDIFF(pk-pk) requirement is not influenced by this.

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