ACS722 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package FEATURES AND BENEFITS DESCRIPTION * Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor * UL60950-1 (ed. 2) certified Dielectric Strength Voltage = 2.4 kVrms Basic Isolation Working Voltage = 420 Vpk/297 Vrms * Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter designtechniques * Pin-selectable band width: 80 kHz for high bandwidth applications or 20 kHz for low noise performance * 0.65 m primary conductor resistance for low power loss and high inrush current withstand capability * Small footprint, low-profile SOIC8 package suitable for space-constrained applications * Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients * 3 to 3.6V, single supply operation The AllegroTM ACS722 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, commercial, and communications systems. The small package is ideal for space constrained applications while also saving costs due to reduced board area. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which includes Allegro's patented digital temperature compensation, resulting in extremely accurate performance over temperature. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is 0.65 m typical, providing low power loss. Continued on the next page... TUV America Certificate Number: U8V 18 02 54214 041 CB 14 11 54214 031 UL Certified File No.: US-32848-UL The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS722 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. Package: 8-pin SOIC (suffix LC) The ACS722 is provided in a small, low profile surface mount SOIC8 package. The leadframe is plated with 100% matte tin, Continued on the next page... Not to scale 1 8 IP+ +I P VCC ACS722 2 7 IP+ VIOUT CBYPASS 0.1 F IP 3 IP- BW_SEL 6 -IP CL 4 IP- GND 5 The ACS722 outputs an analog signal, VIOUT, that changes, proportionally, with the bidirectional AC or DC primary sensed current, IP, within the specified measurement range. The BW_SEL pin can be used to select one of the two bandwidths to optimize the noise performance. Grounding the BW_SEL pin puts the part in the high bandwidth (80 kHz) mode. Typical Application ACS722-DS, Rev. 4 MCO-0000537 June 3, 2019 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 Features and Benefits (continued) Description (continued) * Output voltage proportional to AC or DC current * Factory-trimmed sensitivity and quiescent output voltage for improved accuracy * Chopper stabilization results in extremely stable quiescent output voltage * Nearly zero magnetic hysteresis * Ratiometric output from supply voltage 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. The device is fully calibrated prior to shipment from the factory. Selection Guide Part Number IPR (A) ACS722LLCTR-05AB-T2 5 ACS722LLCTR-10AU-T2 10 ACS722LLCTR-10AB-T2 10 ACS722LLCTR-20AU-T2 20 ACS722LLCTR-20AB-T2 20 ACS722LLCTR-40AU-T2 40 ACS722LLCTR-40AB-T2 40 Sens(Typ) at VCC = 3.3 V (mV/A) TA (C) Packing1 -40 to 150 Tape and Reel, 3000 pieces per reel 264 132 66 33 1Contact Allegro 2Variant for additional packing options. not intended for automotive applications. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 ACS722 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package SPECIFICATIONS Absolute Maximum Ratings Characteristic Supply Voltage Symbol Rating Units VCC Notes 6 V Reverse Supply Voltage VRCC -0.1 V Output Voltage VIOUT 25 V Reverse Output Voltage VRIOUT Operating Ambient Temperature TA Range L -0.1 V -40 to 150 C Junction Temperature TJ(max) 165 C Storage Temperature Tstg -65 to 165 C Isolation Characteristics Characteristic Dielectric Strength Test Voltage Working Voltage for Basic Isolation Clearance Creepage Symbol Notes Rating Unit VISO Agency type-tested for 60 seconds per UL 60950-1 (edition. 2). Production tested at VISO for 1 second, in accordance with UL 60950-1 (edition. 2). 2400 VRMS 420 VPK or VDC 297 VRMS VWVBI Maximum approved working voltage for basic (single) isolation according UL 60950-1 (edition 2). Dcl Minimum distance through air from IP leads to signal leads. 3.9 mm Dcr Minimum distance along package body from IP leads to signal leads. 3.9 mm Thermal Characteristics Characteristic Symbol Test Conditions* Value Units mm2 Package Thermal Resistance (Junction to Ambient) RJA Mounted on the Allegro 85-0593 evaluation board with 400 of 4 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Performance values include the power consumed by the PCB. 23 C/W Package Thermal Resistance (Junction to Lead) RJL Mounted on the Allegro ASEK 722 evaluation board. 5 C/W *Additional thermal information available on the Allegro website. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 VCC Master Current Supply To All Subcircuits Programming Control POR Hall Current Drive Temperature Sensor EEPROM and Control Logic Offset Control IP+ Sensitivity Control IP- Dynamic Offset Cancellation IP+ Tuned Filter VIOUT IP- BW_SEL GND Functional Block Diagram Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 Pin-out Diagram and Terminal List IP+ 1 8 VCC IP+ 2 7 VIOUT IP- 3 6 BW_SEL IP- 4 5 GND Pin-out Diagram Terminal List Table Number Name 1, 2 IP+ 3, 4 IP- 5 GND 6 BW_SEL 7 VIOUT 8 VCC Description Terminals for current being sensed; fused internally Terminals for current being sensed; fused internally Signal ground terminal Terminal for selecting 20 kHz or 80 kHz bandwidth Analog output signal Device power supply terminal Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 ACS722 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package COMMON ELECTRICAL CHARACTERISTICS1: valid through the full range of TA = -40C to 150C, and at VCC= 3.3 V; unless otherwisespecified Characteristic Symbol Min. Typ. Max. Units 3 3.3 3.6 V VCC within VCC(min) and VCC(max) - 9 12 mA VIOUT to GND - - 10 nF 4.7 - - k - 0.65 - m - 10 - G/A IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to GND - 4 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to VCC - 17.5 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to GND - 1 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to VCC - 5 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to GND - 5 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to VCC - 22.5 - s Small signal -3dB; CL = 1 nF, BW_SEL tied to GND - 80 - kHz Small signal -3dB; CL = 1nF, BW_SEL tied to VCC - 20 - kHz Input referenced noise density; TA = 25C, CL = 1 nF - 150 - A(rms)/ Hz Input referenced noise; BWi = 80 kHz, TA= 25C, CL = 1 nF - 42 - mA(rms) Input referenced noise; BWi = 20 kHz, TA= 25C, CL = 1 nF - 21 - mA(rms) ELIN Through full range of IP - 1 VOH RL = 4.7 k, TA = 25C VCC - 0.33 - - V VOL RL = 4.7 k, TA = 25C - - 0.33 V tPO Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied - 64 - s Supply Voltage VCC Supply Current ICC Output Capacitance Load CL Test Conditions Output Resistive Load RL VIOUT to GND Primary Conductor Resistance RIP TA = 25C Magnetic Coupling Factor CF Rise Time Propagation Delay Response Time Internal Bandwidth Noise Density Noise Nonlinearity Saturation Voltage2 Power-On Time tr tpd tRESPONSE BWi IND IN % 1Device may be operated at higher primary current levels, IP, ambient temperatures, TA, and internal leadframe temperatures, provided the Maximum Junction Temperature, TJ(max), is not exceeded. 2The sensor IC will continue to respond to current beyond the range of I until the high or low saturation voltage; however, the nonlinearity in this region will be P worse than through the rest of the measurement range. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 6 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-5AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless oth- erwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -5 - 5 A IPR(min) < IP < IPR(max) - 264 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V TA = 25C to 150C; measured at IP = IPR(max) -2 - 2 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2.5 - % Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT IP = 0 A; TA = 25C to 150C -15 - 15 mV IP = 0 A; TA = -40C to 25C - 20 - mV IP = IPR(max), TA = 25C to 150C -2.5 - 2.5 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 7 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-10AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR 0 - 10 A Sens IPR(min) < IP < IPR(max) - 264 - mV/A VIOUT(Q) Unidirectional; IP = 0 A - VCC x 0.1 - V TA = 25C to 150C; measured at IP = IPR(max) -2 - 2 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2.5 - % Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT IP = 0 A; TA = 25C to 150C -15 - 15 mV IP = 0 A; TA = -40C to 25C - 20 - mV IP = IPR(max), TA = 25C to 150C -2.5 - 2.5 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) xLLCTR-10AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -10 - 10 A IPR(min) < IP < IPR(max) - 132 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-20AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR 0 - 20 A Sens IPR(min) < IP < IPR(max) - 132 - mV/A VIOUT(Q) Unidirectional; IP = 0 A - VCC x 0.1 - V Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) xLLCTR-20AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -20 - 20 A IPR(min) < IP < IPR(max) - 66 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-40AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR 0 - 40 A Sens IPR(min) < IP < IPR(max) - 66 - mV/A VIOUT(Q) Unidirectional; IP = 0 A - VCC x 0.1 - V Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) xLLCTR-40AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Nominal Performance Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -40 - 40 A IPR(min) < IP < IPR(max) - 33 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V Accuracy Performance Sensitivity Error Esens Offset Voltage1 VOE Total Output Error2 ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; ; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift 1 2 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 10 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 CHARACTERISTIC PERFORMANCE xLLCTR-5AB Key Parameters Offset Voltage vs. Temperature 30 1670 20 1660 10 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 1680 1650 1640 1630 1620 -10 -20 -30 -40 1610 1600 -50 0 0 50 100 -50 -50 150 0 Temperature (C) 272 3 270 2 Sensitivity Error (%) Sensitivity (mV/A) 4 268 266 264 262 260 1 0 -1 -2 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -50 100 Temperature (C) 274 258 -50 50 -5 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 11 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-10AB Key Parameters Offset Voltage vs. Temperature 10 1655 5 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 1660 1650 1645 1640 0 -5 -10 1635 -15 -50 0 50 100 150 -50 0 Temperature (C) 150 100 150 Sensitivity Error vs. Temperature 137 4 136 3 135 2 Sensitivity Error (%) Sensitivity (mV/A) 100 Temperature (C) Sensitivity vs. Temperature 134 133 132 131 130 1 0 -1 -2 -3 129 -4 -50 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 50 0.20 0.00 -0.20 -0.40 -0.60 1 0 -1 -2 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 12 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-10AU Key Parameters Offset Voltage vs. Temperature 10 335 5 330 0 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 340 325 320 315 310 305 300 -50 -5 -10 -15 -20 -25 -30 0 50 100 -50 150 0 Temperature (C) 5 274 4 100 150 3 Sensitivity Error (%) Sensitivity (mV/A) 272 270 268 266 264 262 2 1 0 -1 260 -2 258 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 0.20 0.00 -0.20 -0.40 -0.60 1 0 -1 -2 -3 -0.80 -4 -1.00 -5 -50 100 Temperature (C) 276 256 -50 50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 13 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-20AB Key Parameters Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 1652 1650 1650 1648 1648 Offset Voltage (mV) VIOUT(Q) (mV) 1652 1646 1644 1642 1640 1646 1644 1642 1640 1638 1638 1636 1636 1634 -50 0 50 100 1634 -50 150 0 Temperature (C) 100 150 100 150 Temperature (C) Sensitivity Error vs. Temperature Sensitivity vs. Temperature 69 5 69 4 68 3 Sensitivity Error (%) Sensitivity (mV/A) 50 68 67 67 66 66 65 2 1 0 -1 -2 -3 65 -50 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 6 0.80 4 0.40 Total Error (%) Nonlinearity (%) 0.60 0.20 0.00 -0.20 -0.40 -0.60 2 0 -2 -4 -0.80 -1.00 -6 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 14 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-20AU Key Parameters Offset Voltage vs. Temperature 10 335 5 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 340 330 325 320 315 0 -5 -10 -15 310 -50 0 100 50 -20 -50 150 0 Temperature (C) 5 138 4 137 3 Sensitivity Error (%) Sensitivity (mV/A) 150 100 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 136 135 134 133 132 2 1 0 -1 131 -2 130 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 100 Temperature (C) 139 129 -50 50 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 15 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-40AB Key Parameters Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 1654 4 1652 2 1650 Offset Voltage (mV) 0 VIOUT(Q) (mV) 1648 1646 1644 1642 1640 -2 -4 -6 -8 -10 1638 -12 1636 -14 1634 -50 0 100 50 -16 -50 150 0 Temperature (C) 100 150 100 150 Temperature (C) Sensitivity Error vs. Temperature Sensitivity vs. Temperature 35 6 5 35 4 Sensitivity Error (%) Sensitivity (mV/A) 50 34 34 33 3 2 1 0 -1 -2 33 -3 32 -50 -4 0 50 100 150 -50 0 Temperature (C) Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 50 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 16 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 xLLCTR-40AU Key Parameters Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 15 340 10 Offset Voltage (mV) 345 VIOUT(Q) (mV) 335 330 325 320 315 310 -50 5 0 -5 -10 -15 0 100 50 -20 -50 150 0 Temperature (C) 5 69 4 68 3 Sensitivity Error (%) Sensitivity (mV/A) 150 100 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 68 67 67 66 66 65 2 1 0 -1 -2 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 100 Temperature (C) 69 65 -50 50 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 17 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens) The change in sensor IC output in response to a 1A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G/A) (1 G = 0.1 mT)and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. due to sensitivity error, and at relatively low currents, ETOT will be mostly due to Offset Voltage (VOE). In fact, at IP = 0, ETOT approaches infinity due to the offset. This is illustrated in Figures 1 and 2. Figure 1 shows a distribution of output voltages versus IP at 25C and across temperature. Figure2 shows the corresponding ETOT versus IP. Increasing VIOUT (V) Nonlinearity (ELIN) The nonlinearity is a measure of how linear the output of the sensor IC is over the full current measurement range. The nonlinearity is calculated as: { [ ELIN = 1- VIOUT (IPR(max)) - VIOUT(Q) 2 x VIOUT (IPR(max)/2) - VIOUT(Q) [{ Accuracy at 25C Only IPR(min) Full Scale IP Accuracy at 25C Only Decreasing VIOUT (V) Accuracy Across Temperature Figure 1: Output Voltage versus Sensed Current +ETOT The deviation of the device output from its ideal quiescent value of 0.5 x VCC (bidirectional) or 0.1 x VCC (unidirectional) due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. Across Temperature Total Output Error (ETOT) 25C Only The difference between the current measurement from the sensor IC and the actual current (IP), relative to the actual current. This is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: VIOUT_ideal(IP) - VIOUT(IP) Sensideal(IP) x IP IPR(max) 0A Offset Voltage (VOE) ETOT(IP) = +IP (A) VIOUT(Q) -IP (A) Zero Current Output Voltage (VIOUT(Q)) The output of the sensor when the primary current is zero. For a unipolar supply voltage, it nominally remains at 0.5 x VCC for a bidirectional device and 0.1 x VCC for a unidirectional device. For example, in the case of a bidirectional output device, VCC = 3.3 V translates into VIOUT(Q) = 1.65 V. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Accuracy at 25C Only Ideal VIOUT Accuracy Across Temperature x 100 (%) where VIOUT(IPR(max)) is the output of the sensor IC with the maximum measurement current flowing through it and VIOUT(IPR(max)/2) is the output of the sensor IC with half of the maximum measurement current flowing through it. Accuracy Across Temperature x 100 (%) The Total Output Error incorporates all sources of error and is a function of IP. At relatively high currents, ETOT will be mostly -IP +IP -ETOT Figure 2: Total Output Error versus Sensed Current Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 18 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 APPLICATION INFORMATION Impact of External Magnetic Fields The ACS722 works by sensing the magnetic field created by the current flowing through the package. However, the sensor cannot differentiate between fields created by the current flow and external magnetic fields. This means that external magnetic fields can cause errors in the output of the sensor. Magnetic fields which are perpendicular to the surface of the package affect the output of the sensor, as it only senses fields in that one plane. The error in Amperes can be quantified as: B Error(B) = CF where B is the strength of the external field perpendicular to the surface of the package in Gauss, and CF is the coupling factor in G/A. Then, multiplying by the sensitivity of the part, Sens, gives the error in mV. For example, an external field of 1 Gauss will result in around 0.1 A of error. If the ACS722LLCTR-10AB, which has a nominal sensitivity of 132 mV/A, is being used, that equates to 13.2 mV of error on the output of the sensor. Error (mV) External Field (Gauss) Error (A) 0.5 0.05 13.2 1 0.1 26.4 2 0.2 52.8 26.4 5AB 10AB 20AB 40AB 6.6 3.3 1.65 13.2 6.6 3.3 13.2 6.6 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 19 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS Power-On Time (tPO) When the supply is ramped to its operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. Power-On Time, tPO , is defined as the time it takes for the output voltage to settle within 10% of its steady state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, VCC(min), as shown in the chart at right. V Propagation Delay (tpd) The propagation delay is measured as the time interval a) when the primary current signal reaches 20% of its final value, and b) when the device reaches 20% of its output corresponding to the applied current. Response Time (tRESPONSE) The time interval between a)when the primary current signal reaches 90% of its final value, and b) when the device reaches 90% of its output corresponding to the applied current. VIOUT 90% VIOUT VCC(min.) t1 t2 tPO t1= time at which power supply reaches minimum specified operating voltage Rise Time (tr) The time interval between a) when the sensor IC reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. The rise time to a step response is used to derive the bandwidth of the current sensor IC, in which (-3 dB) = 0.35/tr. Both tr and tRESPONSE are detrimentally affected by eddy current losses observed in the conductive IC ground plane. VCC VCC(typ.) t2= time at which output voltage settles within 10% of its steady state value under an applied magnetic field 0 t Figure 3: Power-On Time (tPO) (%) 90 Primary Current VIOUT Rise Time, tr 20 10 0 Propagation Delay, tpd t Figure 4: Rise Time (tr) and Propagation Delay (tpd) (%) 90 Primary Current VIOUT Response Time, tRESPONSE 0 t Figure 5: Response Time (tRESPONSE) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 20 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 Package Outline Drawing For Reference Only - Not for Tooling Use (Reference MS-012AA) Dimensions in millimeters - NOT TO SCALE Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 8 0 4.90 0.10 1.27 0.65 8 8 1.75 0.25 0.17 3.90 0.10 5.60 6.00 0.20 A 1.04 REF 1 2 1 1.27 0.40 C 2 PCB Layout Reference View 0.25 BSC Branded Face SEATING PLANE GAUGE PLANE C 8X 1.75 MAX 0.10 C 0.51 0.31 SEATING PLANE NNNNNNN TPP-AAA LLLLL 0.25 0.10 1.27 BSC 1 A Terminal #1 mark area B Branding scale and appearance at supplier discretion C Reference land pattern layout (reference IPC7351 SOIC127P600X175-8M); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances B Standard Branding Reference View N = Device part number T = Device temperature range P = Package Designator A = Amperage L = Lot number Belly Brand = Country of Origin Figure 6: Package LC, 8-pin SOICN Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 21 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS722 Revision History Revision Revision Date - June 10, 2014 Description of Revision 1 October 29, 2014 2 April 29, 2015 3 December 11, 2018 Updated certificate numbers 4 June 3, 2019 Updated TUV certificate mark Initial release. Added Magnetic Coupling Factor characteristic and Error Due to External Magnetic Fields section Added Characteristic Performance graphs Copyright 2019, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro's products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro's product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 22