Datasheet ACS37002 (Allegro)

ACS37002 400 kHz, High Accuracy Current Sensor with Pin-Selectable Gains and Adjustable Overcurrent Fast Fault in SOICW-16 Package FEATURES AND BENEFITS DESCRIPTION
• High operating bandwidth for fast control loops or where The ACS37002 is a fully integrated Hall-effect current sensor in high-speed currents are monitored an SOICW-16 package that is factory-trimmed to provide high □ 400 kHz bandwidth accuracy over the entire operating range without the need for □ 2 µs typical response time customer programming. The current is sensed differentially by • High accuracy two Hall plates that subtract out interfering external common- □ As low as 1% maximum sensitivity error over temperature mode magnetic fields. (K series) The package construction provides high isolation by □ 6 mV maximum offset voltage over temperature magnetically coupling the field generated by the current in □ Non-ratiometric operation with VREF output the conductor to the monolithic Hall sensor IC which has no □ Low noise LA package physical connection to the integrated current conductor. The • 124 mVRMS for 3.3 V supply MA package is optimized for higher isolation with withstand • 160 mVRMS for 5 V supply voltage, 4.8 kVRMS, and 0.85 mΩ conductor resistance. The □ Differential sensing for high immunity to external LA package is optimized for lower noise with 3.6 kVRMS with magnetic fields stand voltage and 1 mΩ conductor resistance. □ No magnetic hysteresis • Adjustable fast overcurrent alert The fast overcurrent alert fault output has a user-configurable □ 1 µs typical response time threshold by an analog input, providing short-circuit detection □ Pin adjustable threshold and enhanced system protection. The sensor also has four user- • Externally configurable gain settings using two logic pins selectable gain options with two logic inputs without the need for extra components. This reduces the need to stock inventory Continued on the next page… of individual devices with different gain. The analog output with VREF pin is for use in noisy supply environments.
PACKAGE: 16-Pin SOICW (suffix MA/LA)
Not to scale
ACS37002
V VCC 1 CC 16 IP+ GAIN_SEL_0
MCU
2 15 R IP+ GND PU V 3 14 CC IP+ GAIN_SEL_1 VCC 4 13 IP+ VREF ADC IP 5 12 IP- VIOUT ADC 6 11 C IP- VOC REF CL V GND 7 10 CC IP- VCC 8 9 IP- OCF Digital I/O CBYPASS RVOC(H) CVOC RVOC(L)
Figure 1: Typical Bidirectional Application. For more application circuits, refer to the application circuit section.
ACS37002-DS, Rev. 1 July 8, 2020 MCO-0000900 Document Outline Features and Benefits Description Packages Selection guide Absolute Maximum Ratings Isolation Characteristics MA Package Specific Performance LA Package Specific Performance Pinout Diagram and Terminal List Functional Block Diagram Common Electrical Characteristics Performance Characteristics Functional Description Power-On Reset Operation Power-On Power-Off Power-On Timing Power-On Reset (POR) Overvoltage and Undervoltage Detection Undervoltage Detection Voltage Thresholds (VUVD(H/L)) Overvoltage Detection Voltage Thresholds (VOVD(H/L)) Overvoltage/Undervoltage Detection Hysteresis (VOVDHys, VUVDHys) Overvoltage and Undervoltage Enable and Disable Time (tOVD(E/D), tUVD(E/D)) Supply Zener Clamp Voltages Absolute Maximum Ratings Forward and Reverse Supply Voltage Forward and Reverse Output Voltage Forward and Reverse Reference/Fault Voltage Output Source and Sink Current Definitions of Operating and PErformance Characteristics Zero Current Voltage Output (VIOUT(Q), QVO) QVO Temperature Drift (VQE) Reference Voltage (VREF) Reference Voltage Temperature Drift (VRE) Offset Voltage (VOE) Output Saturation Voltage (VSAT(HIGH/LOW)) Sensitivity (Sens) Sensitivity Error (Esens) Gain Selection Pins Full Scale (FS) Nonlinearity (ELIN) Total Output Error (ETOT) Power Supply Offset Error (VPS) Offset Power Supply Rejection Ratio (PSRRO) Power Supply Sensitivity Error (EPS) Sensitivity Power Supply Rejection Ratio (PSRRS) Fault Behavior Overcurrent Fault (OCF) Overcurrent Fault Operating Range/Point (IOCF-OR, IOCF-OP) Overcurrent Fault Hysteresis (IOCF-Hyst) Voltage Overcurrent Pin (VOC) OverCurrent Fault Error (EOCF) OverCurrent Fault Response Time (tOCF) OverCurrent Fault Reaction Time (tOCF-R) OverCurrent Fault Mask Time (tOCF-MASK) OverCurrent Fault Hold Time (tOCF-HOLD) OverCurrent Fault Persist OCF Disable Dynamic Response Parameters Propagation Time (tpd) Rise Time (tR) Response Time (tRESPONSE) Overshoot Settling Time Temperature Compensation Temperature Compensation Update Rate Application and Theory Application Circuits Theory and Functionality – VOC and OCF VOC Driven by Non-Inverting Buffered VREF Power Supply Decoupling Capacitor and Output Capacitive Loads Dynamically Change Gain in a System Thermal Performance Thermal Rise vs. Primary Current Evaluation Board Layout Package Outline Drawings MA Package LA Package