Document
PRELIMINARY - CONFIDENTIAL
Description
AH3782
HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH WITH INTERNAL PULL-UP RESISTOR
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 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 to 28V. With chopper stabilized architecture and an internal bandgap regulator to provide temperature compensated supply for internal 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 Zener clamp.
(Top View)
GND 2
3 OUTPUT 1 VDD
SC59 and SOT23
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 marking surface is larger than the operate point (BOP) the output is switched on (pulled low). The output is held latched until magnetic flux density reverses and becomes lower than the release point (BRP).
The magnetic operating and release polarity is opposite for SOT23 and SC59 packages. SOT23 and SIP-3 packages will require South pole to the part marking side to operate while SC59 will require North pole to the part marking side.
(Top View) SIP-3
3. OUTPUT 2. GND 1. VDD
Features
• Bipolar Latch Operation (South Pole: On, North Pole: off) • 3.0V to 28V Operating Voltage Range • High Sensitivity: BOP and BRP of +40G and -40G Typical • Internally Pull-up Resistor on the Output Pin • Output Overcurrent Limit • Chopper Stabilized Design Provides
- Superior Temperature Stability
- Minimal Switch Point Drift
- Enhanced Immunity to Stress • Good RF Noise Immunity • Zener Clamp on Supply and Output Pins • -40°C to +125°C 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)
Applications
• Brushless DC Motor Commutation • Revolution Per Minute (RPM) Measurement • Flow Meters • Angular and Linear Encoder and Position Sensors • Contact-less Commutation, Speed Measurement and Angular
Position Sensing/Indexing in Consumer Home Appliances, Office Equipments and Industrial Applications
Notes:
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 <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AH3782
Document number: DS38083 Rev. 1 - 2
1 of 14 www.diodes.com
September 2015
© Diodes Incorporated
PRELIMINARY - CONFIDENTIAL
Typical Applications Circuit
3.0V to 28V VDD
AH3782
CIN
AH3782
OUTPUT
GND
Note:
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. RL is the pull-up resistor.
Pin Descriptions
Package: SC59, SOT23 and SIP-3
Pin Number 1 2 3
Pin Name VDD GND
OUTPUT
Power Supply Input Ground Output Pin
Function
Functional Block Diagram
VDD
Power switch
To All Subcircuits
Amp
Amp
Control
OUTPUT
Low-Pass Filter
Sample and Hold
Dynamic Offset Cancellation
Current Limit
GND
AH3782
Document number: DS38083 Rev. 1 - 2
2 of 14 www.diodes.com
September 2015
© Diodes Incorporated
PRELIMINARY - CONFIDENTIAL
AH3782
Absolute Maximum Ratings (Notes 5 & 6) (@TA = +25°C, unless otherwise specified.)
Symbol VDD VDDR
VOUT_MAX IOUT B
PD
Ts TJ ESD
Characteristic
Supply Voltage (Note 6)
Reverse Supply Voltage
Output Off Voltage (Note 6)
Continuous Output Current
Magnetic Flux Density Package Power Dissipation
SIP-3 SC59 and SOT23
Storage Temperature Range
Maximum Junction Temperature
Electrostatic Discharge Withstand Capability - Human Body Model
Value 32 -0.3 32V 60 Unlimited 550 230
-65 to +165 +150 6
Unit V V V mA
mW mW °C °C kV
Notes:
5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.
6. The absolute maximum VDD of 32V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the device at the absolute maximum rated conditions f.