8

A1184-DS, Rev. 2

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch

A1184

Application Information

For additional general application information, visit the Allegro

MicroSystems Web site at www. allegromicro.com.

GND

A118x

VCC

V+

0.01 uF

A

B

B

GND

ECU

Package UA Only

A

B Maximum separation 5 mm

R

SENSE

C

BYP

Figure 3. Typical application circuit

Typical Application Circuit

The A118x family of devices must be protected by an external

noise and the noise generated by the chopper-stabilization func-

tion. As shown in figure 3, a 0.01 μF capacitor is typical.

the A118x pins are no greater than 5 mm in length.

All high-frequency interferences conducted along the supply

only to protect the A118x internal circuitry. As a result, the load

ECU (electronic control unit) must have sufficient protection,

information on EMC is provided on the Allegro MicroSystems

Web site.)