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ACS764 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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ACS764 Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 22 page  Description The Allegro™ ACS764 fully integrated Hall-effect current sensor IC is designed for applications that require digital current sensing and reporting through an I2C™ bus. Allegro factory programming of the offset and gain, including the temperature coefficients, stabilizes the offset and gain over the operating temperature range. This programming greatly reduces the device total error, typically less than 2% over the operating temperature range.Afast response digital fault output is also provided. Both coarse sensitivity and fault level can be programmed via an I2C control register, and can be used for enhanced diagnostic functions. The integrated low resistance conductor eliminates the requirement for external shunt resistors and, by employing Hall-effect sensing technology, eliminates the error associated with changing sense resistance due to temperature. The device allows 16 unique I2C bus addresses, selectable via external pins. The sensor IC gain can be selected by the user through the I2C bus. The device uses a BiCMOS process that allows a highly stable chopper-stabilized small signal amplifier design. The ACS764 is provided in a compact 24-pin QSOP package (suffix LF).The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. ACS764-DS Features and Benefits • Fully integrated current sensor IC in a compact QSOP package eliminates the need for shunt resistors • Hall effect sensing technology eliminates the error associated with shunt resistor variation due to temperature • High accuracy: typical error < 2% over operating temperature range • Fast response digital fault output with programmable level through I2C bus interface • Digital output through I2C interface with 9-bit A-to-D conversion for high resolution current measurement • User-selectable decimation averaging of current output; up to 256 samples • Freeze pin for holding current measurement value while reading many sensors serially • User-selectable (via I2C) coarse sensitivity and OC fault levels, for exceptional flexibility to meet application requirements Fully Integrated, Hall-Effect Based Current Sensor IC With I2C Digital Output and Low-Resistance Current Conductor Package: 24-pin QSOP (suffix LF) Typical Application Diagrams Not to scale ACS764 Continued on the next page… IP ACS764 (I2C Slave) VCC +3.3 V CBYP 0.1 μF RPU VCC VA1 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 IP+ IP+ IP+ IP+ IP+ IP+ IP+ VCC SDA SCL GND NC IP– IP– IP– IP– IP– IP– IP– A1 A0 FAULT FREEZE NC VCC VA0 |
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