HI-SINCERITY

MICROELECTRONICS CORP.

Spec. No. : IC200907

Issued Date : 2009.04.03

Revised Date :2009.10.29

Page No. : 1/7

H277

HSMC Product Specification

H277

Complementary Output Hall Effect Sensor IC

General Description

H277 is designed to integrate Hall sensor with output driver together on the

same chip. It is suitable for dual coils brush-less DC motors, dual coils brush-less DC fan, speed measurement,

and revolution counting.

It includes a band-gap reference voltage source, a Hall device, an amplifier, a hysteretic controller and an open-

collector output drive capable of sinking up to 300mA current load. An on-chip protection diode is implemented to

prevent reverse power fault.

H277 has a control circuit to prevent “dead angle” from logic race condition in DC Fan. It has excellent

characteristic of temperature compensation. The internal temperature compensated voltage source can let sensor

to get uniform sensitivity in a wide temperature range.

It is rated for operation over temperature rage from -20

Features

• On-chip Hall sensor

• 3.0V to 20V operating voltage

• Internal Temperature compensation

• Special design providing logic race condition immunity, shorter switching time, and good switch reliability

• 300mA output sink current

• Internal on-chip protection diode

• SIP-4L Package

Applications

• Dual-coil Brush-less DC Motor

• Dual-coil Brush-less DC Fan

• Revolution Counting

• Speed Measurement

Fig.2 H277 Application Circuit