A3250LLT datasheet(13/16 Pages) ALLEGRO

13 / 16 page

Field-Programmable, Chopper-Stabilized,

Unipolar Hall-Effect Switches

A3250 and

A3251

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

Application Information

For additional general application information, visit the Allegro

MicroSystems Web site at www. allegromicro.com.

Typical application circuit

Typical Application Circuit

It is strongly recommended that an external ceramic bypass

capacitor, CBYP, in the range of 0.01 μF to 0.1 μF be connected

between the VCC pin and the supply and GND pin to reduce

both external noise and noise generated by the chopper-stabiliza-

tion technique. (The diagram at the right shows CBYP at 0.1 μF.)

CBYP should be installed so that the traces that connect it to the

A3250/A3251 are no greater than 5 mm in length. (For program-

ming the device, the capacitor may be further away from the

device, including mounting on the board used for programming

the device.)

The series resistor RS, in combination with CBYP creates a filter

for EMI pulses. (Additional information on EMC is provided

on the Allegro MicroSystems Web site.) RS will have a drop

of approximately 800 mV. This must be taken into consider-

ation when determining the minimum VCC requirement for the

A3250/A3251. The pull-up resistor, RL, should be chosen to

limit the current through the output transistor; do not exceed the

maximum continuous output current of the device.

GND

A3250/A3251

VCC

Supply

0.1

μF

BYP

100

1.2 k

VOUT

Maximum separation 5 mm

from C

BYP to device

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