Dual Output Narrow Pitch

Differential Speed and Direction Sensor IC

A17502

7

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

OPERATING CHARACTERISTICS (continued): Valid over operating ranges, unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ. [14]

Max.

Unit

SWITCH POINT CHARACTERISTICS

Operate Point

BOP

% of BDIFF(pk-pk); VOUT = VOUT(LOW) → VOUT =

VOUT(HIGH); -xD algorithm selection

–

70

–

%

Release Point

BRP

% of BDIFF(pk-pk); VOUT = VOUT(HIGH) → VOUT =

VOUT(LOW); -xD algorithm selection

–

30

–

%

Hysteresis

BHYS

ΔBDIFF after switch

point to allow next

output transition

% of BDIFF(pk-pk);

-xD output protocol

–

40

–

%

-xQ output protocol

–

10

–

G

INPUT CHARACTERISTICS

Operating Frequency

fOP

Fundamental

frequency of the

input magnetic

signal

-S output protocol

0

–

40

kHz

-V or -W output protocol

0

–

20

kHz

Forward Pulse Operating Frequency

fOP(FWD)

-P output protocol

0

–

9

kHz

Reverse Pulse Operating Frequency

fOP(REV)

-P output protocol

0

–

6

kHz

Operating Magnetic Input [15]

BDIFF(pk-pk) See Figure 2

-xD output protocol;

fOP ≤ 20 kHz

30

–

–

G

-xD output protocol;

fOP > 20 kHz

40

–

–

G

-xQ output protocol

100

–

–

G

Operating Magnetic Input Peak [15]

BDIFF

See Figure 2

–1150

–

1150

G

Operating Magnetic Input Signal

Variation [16]

ΔBDIFF(pk-pk)

Bounded amplitude ratio within TWINDOW; no

missed output transitions; possible incorrect

direction data and/or reduction in switch-point

accuracy; see Figure 3 and Figure 4

0.6

–

2

–

Operating Magnetic Input Signal

Variation Window

TWINDOW

Rolling window in which ΔBDIFF(pk-pk) cannot

exceed bounded ratio; see Figure 3 and Figure 4

8

–

–

TCYCLE

THERMAL CHARACTERISTICS

Package Thermal Resistance

RθJA

Single-sided PCB, with copper limited to solder

pads

–

177

–

°C/W

[14]

Typical values are for VCC = 5 V and TA = 25°C, unless otherwise specified.

[15]

Differential magnetic field is measured for left channel (E1-E2) and right channel (E2-E3) independently; see the Package Outline Drawing section. Magnetic field is measured orthogonally to the

branded package face.

[16]

Operating magnetic input variation is valid for symmetrical peak variation about the signal offset. BDIFF(pk-pk) must always be greater than BDIFF(pk-pk,min).