A1186LUA-T【PDF 9/15 页】IC SWITCH HALL EFFECT UNI 3-SIP

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Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

A1185 and

A1186

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Application Information

For additional general application information, visit the Allegro

Web site at www. allegromicro.com.

GND

A118x

VCC

V+

0.01 uF

GND

ECU

Package UA Only

Maximum separation 5 mm

SENSE

BYP

Figure 3. Typical application circuit

Typical Application and Programming Circuit

The A118x family of devices MUST be protected by an exter-

nal bypass capacitor, C

BYP

, connected between the supply pin,

VCC, and the ground pin, GND, of the device. C

BYP

reduces

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

bilization function. As shown in figure 3, a 0.01 糉 capacitor

is typical. (For programming the device, a 0.1 糉 capacitor is

recommended for proper fuse blowing.)

Installation of C

BYP

must ensure that the traces that connect

it to the A118x pins are no greater than 5 mm in length. (For

programming the device, the capacitor may be further away from

the device, including mounting on the board used for program-

ming the device.)

BYP

serves only to protect the A118x internal circuitry. All

high-frequency interferences conducted along the supply lines

are passed directly to the load through C

BYP

. As a result, the

load ECU (electronic control unit) must have sufficient protec-

tion, other than C

BYP

, installed in parallel with the A118x.

A series resistor on the supply side, R

(not shown), in combina-

tion with C

BYP

, creates a filter for EMI pulses.

When determining the minimum V

requirement of the A118x

device, the voltage drops across R

and the ECU sense resistor,

SENSE

, must be taken into consideration. The typical value for

SENSE

is approximately 100 ? (All programming, including

code and lock-bit programming, should be done with direct

connections to VCC and GND, with the use of a 0.1uF bypass

capacitor. Programming across the series resistor or sense resis-

tor may not allow enough energy to properly blow the fuses

in the device, as required for proper programming. The result

would be incorrect switchpoints.

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