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