A1184EUA-T 查看數據表（PDF） - Allegro MicroSystems

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A1184EUA-T

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

Allegro MicroSystems 

A1184

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

Application Information

For additional general application information, visit the Allegro

MicroSystems Web site at www. allegromicro.com.

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.

V+

VCC

B

A118x

GND

A

GND

RSENSE

CBYP

0.01 uF

B

A Package UA Only

B Maximum separation 5 mm

ECU

Figure 3. Typical application circuit

A1184-DS, Rev. 2

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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