ATS682LSH datasheet(11/16 Pages) ALLEGRO

11 / 16 page

Miniature, Two-Wire, True Zero Speed

Differential Peak-Detecting Sensor IC

ATS682LSH

Allegro MicroSystems, Inc.

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 unregu-

lated power supply, transient protection must be added externally.

For applications using a regulated line, EMI/RFI protection may

still be required. Contact Allegro 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

threshold, VCC(UV), the device enters Reset mode, where the

output state returns to the Power-On State (POS) until sufficient

VCC is supplied. ICC levels may not meet datasheet limits when

VCC < VCC(min).

Assembly Description

This device is molded into a plastic body that has been optimized

for size, ease of assembly, and manufacturability. High operat-

ing temperature materials are used in all aspects of construction.

Refer to the Allegro website, www.allegromicro.com, for more

specific applications notes on finished package processing.

Diagnostics

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

tions, requiring one less wire for operation than do switches with

the 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 nar-

row ranges, shown in figure 8 as ICC(HIGH) and ICC(LOW). Any

current level not within these ranges indicates a fault condition.

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.

ATS682

VCC

GND

V+

0.01

μF

ECU

Test pin floating

100

LOAD

NSE

CBYP

ICC(HIGH)(max)

ICC(HIGH)(min)

ICC(LOW)(max)

ICC(LOW)(min)

Range for Valid ICC(HIGH)

Range for Valid ICC(LOW)

+mA



Short

Fault

Open

Figure 7. Typical application circuit

Figure 8. Diagnostic characteristics of supply current values

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