General Description

The AH211 is an integrated Hall sensor with output driver and frequency generator designed for electronic commutation of brush-less DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature drift of Hall sensitivity, two complementary open-collector drivers for sinking large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for internal circuits.

Features

• On-Chip Hall Sensor

• 3.5V to 16V Supply Voltage

• 400mA (avg) Output Sink Current

• -20°C to 85°CC Operating Temperature

• Built-in FG Output

• Low Profile TO-94 (SIP-4L) Package

• ESD Rating: 300V (Machine Model)

Applications

• Dual-Coil Brushless DC Motor

• Dual-Coil Brushless DC Fan

• Revolution Counting

• Speed Measurement