Datasheet ACS37002 (Allegro) - 9

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400 kHz, High Accuracy Current Sensor ACS37002 with Pin-Selectable Gains and Adjustable Overcurrent Fast Fault in SOICW-16 Package COMMON PERFORMANCE CHARACTERISTICS (VREF, FAULT, GAIN_SEL): Valid through full operating temperature range, TA = – 40°C to 150°C, CBYPASS = 0.1 μF, and VCC = 5 V or 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units REFERENCE OUTPUT CHARACTERISTICS (VREF)
Bidirectional; V V CC = 5 V 2.49 2.5 2.51 V REF(BI) Bidirectional; V Zero Current Reference Voltage CC = 3.3 V 1.64 1.65 1.66 V Unidirectional; V V CC = 5 V 0.49 0.5 0.51 V REF(UNI) Unidirectional; VCC = 3.3 V 0.32 0.33 0.34 V I Reference Source Current Limit REF(SRC) Maximum current VREF can passively source – 25 – mA IREF(SNK) Maximum current VREF can passively sink – –25 – mA Reference Slew Rate SRREF CVREF = 0 nF, RVREF = 0 Ω 0.8 – – V/µs
OVERCURRENT FAULT CHARACTERISTICS (OCF)
OCF On Voltage VFAULT-ON RPU = 4.7 kΩ, under fault condition – 0.07 0.4 V No Fault – 100 – nA OCF Sink Current IOCF(SNK) Fault Assertion 0.01 – 1.1 mA VOC Operating Voltage Range VVOC 0.2 – 2 V Fault Error EOCF –10 ±3 10 %IOCF-OP V OCF Hysteresis I CC = 5 V – 6 – %FS OCF(HYS) VCC = 3.3 V – 9 – %FS OCF Reaction Time tOCF-R Time from IOCF-OP, with a 1.2 × IOCF-OP until fault asserts – 1 1.5 μs OCF Mask tOCF-MASK Time IOCF-OP must be present after tOCF-R for fault assertion [3] 0 0.5 3 µs OCF Response Time tOCF tOCF-MASK = 0.5µs – 1.5 2 µs OCF Hold Time tOCF-HOLD Minimum duration of FAULT assertion [3] 0 0 5 ms
GAIN SELECTION PIN CHARACTERISTICS (GAIN_SEL0, GAIN_SEL1)
Gain Select Internal Resistor RGSint – 1 – MΩ V V CC = 5 V 3.75 – – V GAIN_SEL Logic Input Voltage H(SEL) VCC = 3.3 V 2.25 – – V VL(SEL) – – 0.5 V Leakage Current ISEL(SNK) – – ±10 µA [1] VCC rate +1 V/ms, for best accuracy. [2] Only enabled on 5V devices. [3] Typical value is factory default; 9 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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