ATS128 datasheet(4/25 Pages) ALLEGRO

4 / 25 page

Highly Programmable, Back-Biased,

Hall-Effect Switch with TPOS Functionality

ATS128LSE

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

OPERATING CHARACTERISTICS (continued) Valid with TA = –40°C to 150°C, CBYPASS = 0.1 μF, VCC = 12 V,

unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Output Stage Characteristics (continued)

Output Polarity2

POL

POL = 0

B > BOP, opposite tooth

–

Low

–

B < BRP, opposite valley

–

High

–

POL = 1

B > BOP, opposite tooth

–

High

–

B < BRP, opposite valley

–

Low

–

Magnetic Characteristics

valid VCC = 3 to 24 V, TJ ≤ TJ(max), using Allegro 8X reference target, unless otherwise noted

Air Gap Setpoint Drift Over Temperature5

AGDrift

Device programmed with air gap of 2.5 mm

–

±0.2

–

Programming Characteristics

Switchpoint Magnitude Selection Bits

BitBOPSEL

–8–

Bit

Switchpoint Polarity Bits

BitBOPPOL

–1–

Bit

Output Polarity Bits

BitPOL

–1–

Bit

Fall Time Bits

BitFALL

–2–

Bit

Device Lock Bits

BitLOCK

–1–

Bit

Programmable Air Gap Range6,7

AGRange

TA = 25°C, Minimum code (BOPPOL = 1,

BOPSEL = 255)

2.5

–

TA = 25°C, Maximum code (BOPPOL = 0,

BOPSEL = 255)

–

1.5

AGRange Programming Resolution

ResAG

TA = 25°C, device programmed with air gap of

2.5 mm

–

0.05

–

1Determined by design and device characterization.

2Output state when device configured as shown in figure 4.

3Output Rise Time is governed by external circuit tied to VOUT. Measured from 10% to 90% of steady state output.

4Measured from 90% to 10% of steady state output.

5Switchpoint varies with temperature, proportionally to the programmed air gap. This parameter is based on characterization data and is not a tested

parameter in production. The AGDrift value trends smaller as temperature increases.

6Switchpoint varies with temperature. A sufficient margin, obtained through customer testing, is recommended to ensure functionality across the

operating temperature range. Programming at larger air gaps leaves less margin for switchpoint drift.

7At the minimum code setpoint (BOPSEL = 255, BOPPOL = 1), the switchpoint can correspond to an air gap greater than 2.5 mm, and at maximum

code setpoint (BOPSEL = 255, BOPPOL = 0), the switchpoint can correspond to an air gap smaller than 1.5 mm.

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