AH3776 HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH Description Pin Assignments The AH3776 is a high-voltage, medium-sensitivity Hall Effect latch IC designed for commutation of brushless DC motors, flow meters, (Top View) linear encoders and position sensors in industrial and consumer home appliances and personal care applications. To support a wide 3 OUTPUT range of demanding applications, the design is optimized to operate GND 2 over the supply range of 3.0V to 28V. With chopper stabilized 1 V DD architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits, the AH3776 provides a reliable solution over the whole operating range. For SOT23 robustness and protection, the device has a reverse blocking diode with a Zener clamp on the supply. The output has an overcurrent limit and a Zener clamp. (Top View) The single, open-drain output can be switched on with South pole of 3. OUTPUT sufficient strength and switched off with North pole of sufficient 2. GND strength. When the magnetic flux density (B) perpendicular to the package is larger than the operate point (B ) the output is switched OP V 1. DD on (pulled low). The output is held latched until magnetic flux density SIP-3 reverses and becomes lower than the release point (B ). RP Features Applications Bipolar Latch (South Pole: On, North Pole: off) Brushless DC Motor Commutation 3.0V to 28V Operating Voltage Range Revolution Per Minute (RPM) Measurement High Sensitivity: B and B of +110G and -110G Typical OP RP Flow Meters Single, Open-Drain Output with Overcurrent Limit Angular and Linear Encoder and Position Sensors Chopper Stabilized Design Provides Contact-less Commutation, Speed Measurement and Angular - Superior Temperature Stability Position Sensing/Indexing in Consumer Home Appliances, Office - Minimal Switch Point Drift Equipment and Industrial Applications - Enhanced Immunity to Stress Good RF Noise Immunity Reverse Blocking Diode and Zener Clamp on Supply -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 AH3776 Typical Applications Circuit 3.0V to 28V V DD R L OUTPUT AH3776 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: 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 13 AH3776 September 2015 Diodes Incorporated www.diodes.com Document number: DS38230 Rev. 1 - 2 PRELIMINARY - CONFIDENTIAL