ATS625LSG datasheet(11/21 Pages) ALLEGRO

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True Zero-Speed Low-Jitter High Accuracy

Gear Tooth Sensor

ATS625LSG

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

Undervoltage Lockout

When the supply voltage falls below the undervoltage lockout

level, VCCUV, the device switches to the OFF state. The device

remains in that state until the voltage level is restored to to the

VCC operating range. Changes in the target magnetic profile

have no effect until voltage is restored. This prevents false sig-

nals caused by undervoltage conditions from propagating to the

output of the sensor.

Power Supply Protection

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

a wide range of supply voltage levels. For applications using an

unregulated power supply, transient protection must be added

externally. For applications using a regulated supply line, EMI

and RFI protection may still be required. The circuit shown in

figure 5 is the basic configuration required for proper device

operation. Contact Allegro field applications engineering for

information on the circuitry required for compliance to various

EMC specifications.

Internal Electronics

The ATS625LSG contains a self-calibrating Hall effect IC

that possesses two Hall elements, a temperature compensated

amplifier and offset cancellation circuitry. The IC also contains

a voltage regulator that provides supply noise rejection over the

operating voltage range. The Hall transducers and the electron-

ics are integrated on the same silicon substrate by a proprietary

BiCMOS process. Changes in temperature do not greatly affect

this device due to the stable amplifier design and the offset rejec-

tion circuitry.

VCC

Sensor Output

GND

VOUT

AUX

CBYPASS

0.1 µF

RPU

ATS625

Figure 5. Power Supply Protection Typical Circuit

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