ATS17501 datasheet(7/23 Pages) ALLEGRO

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Dual Output Differential Speed and Direction Sensor IC

ATS17501

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(PKPK); VOUT = VOUT(LOW) → VOUT =

VOUT(HIGH); Dynamic Threshold option

–

Release Point

BRP

% of BDIFF(PKPK); VOUT = VOUT(HIGH) → VOUT =

VOUT(LOW); Dynamic Threshold option

–

Hysteresis

BHYS

ΔBDIFF after

switch point

to allow next

output transition

% of BDIFF(PKPK);

Dynamic Threshold option

–

Fixed Threshold option

–

INPUT CHARACTERISTICS

Operating Frequency

fOP

Sinusoidal input signal; forward and reverse

target rotation; not valid for Pulse or Inverse

Pulse output protocol

–

kHz

Forward Pulse Operating Frequency

fOP(FWD)

Pulse or Inverse Pulse output protocol

–

kHz

Reverse Pulse Operating Frequency

fOP(REV)

Pulse or Inverse Pulse output protocol

–

kHz

Operating Magnetic Input [15]

BDIFF(pk-pk) See Figure 2

Dynamic Threshold option;

fOP ≤ 20 kHz

–

Dynamic Threshold option;

fOP > 20 kHz

–

Fixed Threshold option

100

–

Operating Magnetic Input Peak [15]

BDIFF

See Figure 2

–1150

–

1150

Operating Magnetic Input Signal

Variation [16]

ΔBDIFF(pk-pk)

Bounded amplitude ratio within TWINDOW; no

missed output transitions; possible incorrect

direction information and/or reduction in switch

point accuracy; see Figure 3 and Figure 4

0.6

–

Operating Magnetic Input Signal

Variation Window

TWINDOW

Rolling window in which ΔBDIFF(pk-pk) cannot

exceed bounded ratio; see Figure 3 and Figure 4

–

TCYCLE

Operating Air Gap [17]

Using Reference Target 60-0; fOP < 10 kHz;

Dynamic Threshold option

0.75

–

2.75

THERMAL CHARACTERISTICS

Package Thermal Resistance

RθJA

Minimum-K PCB, single layer, single-sided, with

copper limited to solder pads

–

126

–

°C/W

Low-K PCB, single layer, single-sided, with

copper limited to solder pads and 3.57 in.2

(23.03 cm2) of copper area each side

–

°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 (F1-F2) and Right Channel (F2-F3) independently; see Package Diagram. 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).

[17]

Operating air gap is dependent on the available magnetic field. The available magnetic field is target geometry, material, and speed dependent. Operational air gap should be independently charac-

terized for each target.

Advance Information Datasheet

Subject to Change Without Notice

March 19, 2020

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