A1180 datasheet(9/15 Pages) ALLEGRO

9 / 15 page

Sensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

A1180, A1181,

A1182, and A1183

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.

GND

A118x

VCC

V+

0.01 uF

GND

ECU

Package UA Only

B Maximum separation 5 mm

SENSE

BYP

Figure 3. Typical application circuit

Typical Application Circuit

The A118x family of devices must be protected by an external

bypass capacitor, CBYP, connected between the supply, VCC,

and the ground, GND, of the device. CBYP reduces both external

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

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

Installation of CBYP must ensure that the traces that connect it to

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

All high-frequency interferences conducted along the supply

lines are passed directly to the load through CBYP, and it serves

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

ECU (electronic control unit) must have sufﬁcient protection,

other than CBYP, installed in parallel with the A118x.

A series resistor on the supply side, RS (not shown), in combi-

nation with CBYP, creates a ﬁlter for EMI pulses. (Additional

information on EMC is provided on the Allegro MicroSystems

Web site.)

When determining the minimum VCC requirement of the A118x

device, the voltage drops across RS and the ECU sense resistor,

RSENSE, must be taken into consideration. The typical value for

RSENSE is approximately 100 Ω.

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