Datasheet ACS37002 (Allegro) - 33

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400 kHz, High Accuracy Current Sensor ACS37002 with Pin-Selectable Gains and Adjustable Overcurrent Fast Fault in SOICW-16 Package APPLICATION AND THEORY Application Circuits
GS GS0 1 16 Options VOC Options GND 2 15 (1) VREF supplied VOC (2) Externally supplied VOC GS1 VOC = VREF×
(
RVOC/(RVOC+RVREF)
)
3 14
Bidirectional ONLY
VOC = 0.2 V ↔2 V VREF V 4 13 V REF IOUT VOC ACS37002 Options V R VOC Vref RVREF REF 5 12 VOC VOC R 6 11 VCC VOC External Source V 7 10 CC RPU OCF 8 9 (3a) No VOC supply (3b) No VOC supply EEPROM EEPROM GS Options OCF Options VREF VREF GS = 00 GS = 01 RVref VOC RVref VOC GS0 VCC VOther GS1 GS0 (4) Non-inverting buffered VOC supply VOC = V R REF×(1+R2/R1) GS1 PU GS = 00
Unidirectional ONLY
GS0 VCC OCF V
NOTE:
REF
VREF error will also
GS1
OCF pin can be pulled
RVREF VOC
be gained into the
GS = 11
up to different supply VOC input. This if needed, as long as should be considered
VCC
when selecting or
GS = 10
the pin voltage does not exceed the OCF max
R R 2
using configuration 4.
1 GS0 GS0 V
voltage rating.
CC GS1 GS1
Figure 20: Applications Circuits for GAIN_SEL, VOC, and FAULT pin
These configurations are simplified to the network required for functionality. Bypass and load capacitors are recommend for best performance. 33 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