AH2985-P-B

AH2985 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description Pin Assignments NEW PRODUCT The AH2985 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Halleffect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage. (Top View) AH2985 1 : VDD To help protect the motor coils, the AH2985 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. 2 : DO 3 : DOB 4 : GND The AH2985 is available in TO94 package. 1 2        Single-Chip Solution Operating Voltage: 2.5V to 15V Built-in Hall Sensor and Input Amplifier Rotor Lock Protection (Lock Detection, Output Shutdown and Automatic re-Start) Built-in Reverse Voltage Protection Diode Built-in Zener Protection for Output Drivers Average Output Current up to 500mA Package: TO94 “Green” Molding Compound Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 4 TO94 Features     3 Applications   Two-Coil BLDC Cooling Fans Low Voltage/ Low Power BLDC Motors 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain