ATS642 datasheet(12/16 Pages) ALLEGRO

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Two-Wire True Zero Speed Miniature Differential

Peak-Detecting Gear Tooth Sensor with Continuous Calibration

ATS642LSH

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Power Supply Protection

The device contains an on-chip regulator and can operate over

a wide VCC range. For devices that need to operate from an

unregulated power supply, transient protection must be added

externally. For applications using a regulated line, EMI/RFI pro-

tection may still be required. Contact Allegro Microsystems for

information on the circuitry needed for compliance with various

EMC specifications. Refer to figure 7 for an example of a basic

application circuit.

Undervoltage Lockout

When the supply voltage falls below the undervoltage lockout

voltage, VCC(UV), the device enters Reset, where the output state

returns to the Power-On State (POS) until sufficient VCC is sup-

plied. ICC levels may not meet datasheet limits when

VCC < VCC(min).

Assembly Description

This sensor is integrally molded into a plastic body that has been

optimized for size, ease of assembly, and manufacturability.

High operating temperature materials are used in all aspects of

construction.

Diagnostics

The regulated current output is configured for two-wire appli-

cations, requiring one less wire for operation than do switches

with the more traditional open-collector output. Additionally,

the system designer inherently gains diagnostics because there is

always output current flowing, which should be in either of two

narrow ranges, shown in figure 8 as ICC(High) and ICC(Low). Any

current level not within these ranges indicates a fault condi-

tion. If ICC > ICC(High)max, then a short condition exists, and if

ICC < ICC(low)min, then an open condition exists. Any value of ICC

between the allowed ranges for ICC(High) and ICC(Low) indicates a

general fault condition.

Figure 7: Typical Application Circuit

ATS642

VCC

GND

V+

0.01

μF

ECU

Pins 2 and 3 floating

100

SENSE

CBYP

Figure 8: Diagnostic Characteristics of Supply Current Values

ICC(High)max

ICC(High)min

Range for Valid ICC(HIGH)

Range for Valid ICC(LOW)

ICC(Low)max

ICC(Low)min

+mA



Short

Fault

Open

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