AH3782 HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH WITH INTERNAL PULL-UP RESISTOR Description Pin Assignments The AH3782 is a high-voltage, high-sensitivity Hall Effect latch IC with internal pull-up resistor designed for commutation of brushless DC motors, flow meters, linear encoders and position sensors in (Top View) industrial and consumer home appliances and personal care applications. To support a wide range of demanding applications, the design has been optimized to operate over the supply range of 3.0V 3 OUTPUT to 28V. With chopper stabilized architecture and an internal bandgap GND 2 regulator to provide temperature compensated supply for internal 1 V DD circuits, the AH3782 provides a reliable solution over the whole operating range. For robustness and protection, the device has a Zener clamp on the supply. The output has an overcurrent limit and a SC59 and SOT23 Zener clamp. The internally pulled-up output can be switched on with South pole of sufficient strength and switched off with North pole of sufficient strength. When the magnetic flux density (B) perpendicular to the part (Top View) marking surface is larger than the operate point (B ) the output is OP switched on (pulled low). The output is held latched until magnetic flux 3. OUTPUT density reverses and becomes lower than the release point (B ). RP GND 2. The magnetic operating and release polarity is opposite for SOT23 V 1. DD and SC59 packages. SOT23 and SIP-3 packages will require South SIP-3 pole to the part marking side to operate while SC59 will require North pole to the part marking side. Features Applications Brushless DC Motor Commutation Bipolar Latch Operation (South Pole: On, North Pole: off) Revolution Per Minute (RPM) Measurement 3.0V to 28V Operating Voltage Range High Sensitivity: B and B of +40G and -40G Typical Flow Meters OP RP Angular and Linear Encoder and Position Sensors Internally Pull-up Resistor on the Output Pin Contact-less Commutation, Speed Measurement and Angular Output Overcurrent Limit Position Sensing/Indexing in Consumer Home Appliances, Office Chopper Stabilized Design Provides Equipments and Industrial Applications - Superior Temperature Stability - Minimal Switch Point Drift - Enhanced Immunity to Stress Good RF Noise Immunity Zener Clamp on Supply and Output Pins -40C to +125C Operating Temperature ESD (HBM): 6kV Industry Standard SC59, SOT23 and SIP-3 Packages Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See Low-Pass Filter Sample and Hold Dynamic Offset Cancellation AH3782 Typical Applications Circuit 3.0V to 28V V DD OUTPUT AH3782 C IN GND Note: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. R is the pull-up resistor. IN L Pin Descriptions Package: SC59, SOT23 and SIP-3 Pin Number Pin Name Function 1 V Power Supply Input DD 2 GND Ground 3 OUTPUT Output Pin Functional Block Diagram V DD Power switch To All Subcircuits OUTPUT Amp Amp Control Current Limit GND 2 of 14 AH3782 September 2015 Diodes Incorporated www.diodes.com Document number: DS38083 Rev. 1 - 2 PRELIMINARY - CONFIDENTIAL