Single Output Hall Effect Latch

ATS177

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev.A6 Jun 23, 2004

1/6

ATC

Features

- 3.5V to 20V DC operation voltage

- Temperature compensation

- Wide operating voltage range

- Open-Collector pre-driver

- 25mA maximum sinking output current.

- Reverse polarity protection

- Package: SIP3, SOT23

Applications

- Brush-less DC Motor

- Brush-less DC Fan

- Revolution counting

- Speed measurement

General Description

ATS177 is an integrated Hall effect latched sensor

designed for electronic commutation of brush-less

DC motor applications. The device includes an

on-chip Hall voltage generator for magnetic sensing,

a comparator that amplifies the Hall voltage, and a

schmitt trigger to provide switching hysteresis for

noise rejection, and open-collector output. An

internal bandgap regulator is used to provide

temperature compensated supply voltage for

internal circuits and allows a wide operating supply

range.

If a magnetic flux density larger than threshold Bop,

DO is turned on(low). The output state is held until

a magnetic flux density reversal falls below Brp

causing DO to be turned off (high).

Ordering Information

ATS177 X -X X X -X

Packing

Blank : Tube or Bulk

A : Tape & Reel

P: SIP3

W: SOT23

Package

Lead

L : Lead Free

Blank: Normal

Wafer Body

Magnetic

Characteristics

Blank or

A~Z : if necessary

to specify

A or B

Typical Application Circuit

+12V

U1

ATS177

VCC

1

GND

2

OUTPUT

3

Q1

NPN

Q2

NPN

R1

2K

R2

3K

D1

+ C1

0.47uF

+ C2

0.47uF

L1

L2

Brush-less DC Fan