ACS37010 ALLEGRO | Alldatasheet
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The ACS37010 and ACS37012 are fully integrated current sensor ICs that sense current flowing through the compact SOIC LZ package. The current conductor has a very low 0.68 mΩ resistance, ideal for low power dissipation constraints. The sensor is factory-trimmed to provide high accuracy over the entire operating range without the need for customer programming. The internal construction provides high isolation and excellent magnetic coupling of the field generated by the current flowing in the conductor and the fully monolithic Hall sensor IC. The current is sensed differentially by two Hall plates that subtract interfering common-mode magnetic fields. The sensor provides a very fast 1.3 μs response time analog output with VREF pin for use in noisy supply environments (ACS37010) or a fast logic alert fault output pin with factory pre-programmed trip point provides overcurrent or short-circuit detection and enhanced system protection (ACS37012). The IC has no physical connection to the integrated current conductor and provides 3500 V RMS of isolation between the primary and secondary signal leads of the package. This rating provides basic working voltage of 840 V RMS and reinforced working voltage of 420 VRMS. The ACS37010/12 is in a custom 6-pin SOIC package (suffix LZ). Devices are RoHS-compliant and lead (Pb) free without the use of RoHS exemptions with 100% matte-tin-plated leadframes. ACS37010-DS, Rev. 4 MCO-0001366
- High operating bandwidth and fast response time □ 450 kHz bandwidth □ 1.3 µs response time
- High-accuracy current measurements □ ±1.5% sensitivity error over temperature □ ±4 mV offset voltage over temperature □ Non-ratiometric operation with VREF output for enhanced accuracy in noisy environments □ Differential sensing robust against external magnetic fields □ Magnetic hysteresis-free operation
- Wide operating temperature, –40°C to 150°C
- Low internal primary conductor resistance (0.68 mΩ) for better power efficiency (low dissipation)
- Highly isolated compact surface-mount package □ 3500 VRMS withstand voltage □ 840 VRMS / 1188 VDC basic isolation voltages □ 420 VRMS / 594 VDC reinforced isolation voltages
- AEC-Q100 Grade 0, automotive qualified 450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package PACKAGE: CUSTOM 6-PIN SOIC (SUFFIX LZ) Figure 1: Typical Application Circuit Not to scale ACS37010 and ACS37012 FEATURES AND BENEFITS DESCRIPTION November 9, 2023 VDD IP+ IP- VDD VOUT VREF GND IP CBYPASS 4 5 ACS37010 VDD VDD ADC ADC GND MCU VDD IP+ IP- VDD VOUT FAULT GND CBYPASS RL_FAULT1 4 5 IP ACS37012 MCU VDD VDD GND ADC Digital I/O
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SELECTION GUIDE Part Number Current Sensing Range, IPR (A) Sensitivity (mV/A) VDD (V) VQVO (V) Pin 6 Function Optimized Temperature Range, TA (°C) Packing ACS37010LLZATR-030B5 ±30 66.7 5 2.5 VREF –40 to 150 Tape and Reel, 3000 pieces per reel ACS37010LLZATR-030B3 ±30 44 3.3 1.65 ACS37010LLZATR-050B5 ±50 40 5 2.5 ACS37010LLZATR-050B3 ±50 26.4 3.3 1.65 ACS37012LLZATR-030B5 ±30 66.7 5 2.5 FAULT ACS37012LLZATR-030B3 ±30 44 3.3 1.65 ACS37012LLZATR-050B5 ±50 40 5 2.5 ACS37012LLZATR-050B3 ±50 26.4 3.3 1.65 ACS 37012 L LZA - 030 B 5 Supply Voltage: 5 – VDD = 5 V 3 – VDD = 3.3 V Output Directionality: B – Bidirectional Current Sensing Range (A) Package Designator Optimized Temperature Range L – -40°C to 150°C
5 Digit Part Number
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ISOLATION CHARACTERISTICS Characteristic Symbol Notes Value Units Withstand Voltage [1][2] VISO Agency rated for 60 seconds per UL 62368-1 (edition 3) 3500 VRMS Impulse Withstand VIMPULSE Tested ±5 pulses at 2/minute in compliance to IEC 61000-4-5, 1.2 μs (rise) / 50 μs (width) 5000 VPK Working Voltage for Basic Isolation [2] VWVBI Maximum approved working voltage for basic (single) isolation according to UL 62368-1 (edition 3)
1188 VPK or VDC
840 VRMS
Working Voltage for Reinforced Isolation [2] VWVRI Maximum approved working voltage for reinforced isolation according to UL 62368-1 (edition 3)
594 VPK or VDC
420 VRMS
Clearance DCL Minimum distance through air from IP leads to signal leads 4.2 mm Creepage DCR Minimum distance along package body from IP leads to signal leads 4.2 mm Distance Through Insulation DTI Minimum internal distance through insulation 54 µm Comparative Tracking Index CTI Material Group I >600 V [1] 100% production-tested for 1 second in accordance with UL 62368-1 (edition 3). [2] Certification pending. ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Min. Max. Unit Supply Voltage VDD –0.5 6.5 V Output Voltage VO Applies to VOUT, VREF or VFAULT –0.5 (VDD + 0.7) ≤ 6.5 V Operating Ambient Temperature TA –40 150 °C Storage Temperature TSTG –65 165 °C Maximum Junction Temperature TJ(max) – 165 °C
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com IP+ IP– VDD VOUT VREF/FAULT GND ACS37010/ ACS37012 Pinout Diagram Package LZ, 6-Pin SOIC Terminal List Table Number Name Description
1 IP+ Terminal for current being sensed
4 IP– Terminal for current being sensed
5 GND Device ground terminal
6 VREF/
Zero current voltage reference (ACS37010) or overcurrent fault output (ACS37012)
7 VOUT Analog output representing the current flowing through IP
8 VDD Device power supply terminal
Characteristic Symbol Notes Min. Typ. Max. Unit Internal Conductor Resistance RIC TA = 25°C – 0.68 – mΩ Internal Conductor Inductance LIC TA = 25°C – 2.4 – nH Moisture Sensitivity Level MSL Per IPC/JEDEC J-STD-020 – 2 – –
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL BLOCK DIAGRAM ACS37010 VDD IP+ IP– GND VREF VOUT Hall Plates Front Amplifier Back Amplifier VOUT Buffer VREF Buffer Digital Regulator EEPROM/ Digital Block Signal Path Control and Temperature Control DIGITAL Figure 2: ACS70310 Functional Block Diagram ACS37012 VDD IP+ IP– GND FAULT VOUT Hall Plates Front Amplifier Back Amplifier VOUT Buffer Fault Comp. Digital Regulator EEPROM/ Digital Block Signal Path Control and Temperature Control DIGITAL Digital Regulator Figure 3: ACS37012 Functional Block Diagram
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com COMMON ELECTRICAL CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 5 V or 3.3 V, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Supply Voltage VDD 5 V variant 4.5 5 5.5 V 3.3 V variant 3 3.3 3.6 V Supply Current IDD
5 V variant, no load on VOUT or VREF – 16 20 mA
3.3 V variant, no load on VOUT or VREF – 14 18 mA
VOUT Capacitive Load CL_VOUT VOUT to GND – – 6 nF Supply Bypass Capacitor CBYPASS VDD to GND 0.1 1 – µF Power-On Reset Release Voltage VPOR VDD rising 1 V/ms 2.7 2.9 3 V Power-On Reset Hysteresis VPOR_HYS 250 300 500 mV Power-On Time tPO TA = 25°C – 65 – µs Undervoltage Detection Threshold [1] VUVD TA = 25°C, VDD falling 1 V/ms 3.8 4.1 4.25 V Undervoltage Detection Hysteresis [1] VUVD_HYS 200 250 400 mV Undervoltage Detection Time [1] tUVD VDD < VUVD – 70 200 µs Undervoltage Detection Release Time [1] tUVD_R VDD > (VUVD + VUVD_HYS) – 6 – µs Overvoltage Detection Threshold VOVD TA = 25°C, VDD rising 1 V/ms 6.1 6.3 6.5 V Overvoltage Detection Hysteresis VOVD_HYS TA = 25°C 400 500 600 mV Overvoltage Detection Time tOVD VDD > VOVD – 70 200 µs Overvoltage Detection Release Time tOVD_R VDD < (VOVD – VOVD_HYS) – 3 – µs Rise Time tR TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF – 1 2.5 µs Response Time tRESP TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF – 1.3 2.5 µs Propagation Delay tPD TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF – 0.7 1.5 µs Bandwidth BW TA = 25°C, Small Signal –3 dB, CL_VOUT = 6 nF, CBYPASS = 1 µF – 450 – kHz Noise Density ND TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF,
5 V variant – 150 – µA/√Hz
TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF,
3.3 V variant – 230 – µA/√Hz
VSAT_H RL_VOUT = 10 kΩ to GND VDD – 0.25 – – V VSAT_L RL_VOUT = 10 kΩ to VDD – – 0.15 V VOUT Short-Circuit Current ISC_VOUT TA = 25°C, VOUT shorted to GND – 25 – mA TA = 25°C, VOUT shorted to VDD – –25 – mA Common Mode Field Sensitivity CMFS – 4 – mA/G Continued on next page...
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com COMMON ELECTRICAL CHARACTERISTICS (continued): Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 5 V or 3.3 V, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit REFERENCE OUTPUT CHARACTERISTICS (VREF) [2] VREF Resistive Load RL_VREF VREF to GND or VREF to VDD 10 – – kΩ VREF Capacitive Load CL_VREF VREF to GND – 1 6 nF VREF Short-Circuit Current ISC_VREF VREF shorted to GND – 25 – mA VREF shorted to VDD – –25 – mA OVERCURRENT CHARACTERISTICS (FAULT) [3] Overcurrent Operating Point IOC Internally set as a percent of full scale current – 100 – %IPR FAULT Pull-Up Resistance RL_FAULT FAULT to VDD 4.7 – 500 kΩ Overcurrent Error EOC –10 – 10 %IOC[4] FAULT Output Low Voltage VFAULT_L RL_FAULT = 10 kΩ, fault condition present – – 0.4 V FAULT Leakage Current IFAULT_OFF RL_FAULT = 10 kΩ, no fault condition present – 100 500 nA Overcurrent Hysteresis IOC_HYS – 9.5 – %IPR Overcurrent Response Time tOC_RESP – 1.7 2.7 µs [1] Only enabled on 5 V devices. [2] ACS37010 only. [3] ACS37012 only. [4] Where IOC is the specific point at which the OCF trigger will occur.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37010LLZATR-030B5 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –30 – 30 A Sensitivity Sens IPR(min) < IP < IPR(max) – 66.7 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 2.5 – V Reference Voltage Output VREF – 2.5 – V ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±0.8 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±0.8 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±5 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±5 8 mV Reference Voltage Output Error VREF_E TA = 25°C to 150°C –8 ±5 8 mV TA = –40°C to 25°C –8 ±5 8 mV Offset Error VOE IP = 0 A, TA = 25°C to 150°C –4 ±2 4 mV IP = 0 A, TA = –40°C to 25°C –4 ±2 4 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 8.5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.2 ±0.7 1.2 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –9 ±6 9 mV Power Supply Reference Voltage Output Error VREF_PS VDD(MIN) to VDD(MAX) –9 ±6 9 mV Power Supply Offset Error VOE_PS VDD(MIN) to VDD(MAX) –8 ±5 8 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –10 – 10 mV IP = 0 A, TA = –40°C to 25°C –10 – 10 mV Reference Voltage Output Error Including Lifetime Drift VREF_LTD TA = 25°C to 150°C –10 – 10 mV TA = –40°C to 25°C –10 – 10 mV Offset Error Including Lifetime Drift VOE_LTD IP = 0 A, TA = 25°C to 150°C –3 – 3 mV IP = 0 A, TA = –40°C to 25°C –3 – 3 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37010LLZATR-030B3 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –30 – 30 A Sensitivity Sens IPR(min) < IP < IPR(max) – 44 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 1.65 – V Reference Voltage Output VREF – 1.65 – V ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±1 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±1 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±4 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±4 8 mV Reference Voltage Output Error VREF_E TA = 25°C to 150°C –8 ±4 8 mV TA = –40°C to 25°C –8 ±4 8 mV Offset Error VOE IP = 0 A, TA = 25°C to 150°C –3 ±1.5 3 mV IP = 0 A, TA = –40°C to 25°C –3 ±2 3 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 8.5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.4 ±1.2 1.4 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV Power Supply Reference Voltage Output Error VREF_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV Power Supply Offset Error VOE_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –10 – 10 mV IP = 0 A, TA = –40°C to 25°C –10 – 10 mV Reference Voltage Output Error Including Lifetime Drift VREF_LTD TA = 25°C to 150°C –10 – 10 mV TA = –40°C to 25°C –10 – 10 mV Offset Error Including Lifetime Drift VOE_LTD IP = 0 A, TA = 25°C to 150°C –3 – 3 mV IP = 0 A, TA = –40°C to 25°C –3 – 3 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37010LLZATR-050B5 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –50 – 50 A Sensitivity Sens IPR(min) < IP < IPR(max) – 40 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 2.5 – V Reference Voltage Output VREF – 2.5 – V ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±1.1 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±1.1 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±5 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±5 8 mV Reference Voltage Output Error VREF_E TA = 25°C to 150°C –8 ±5 8 mV TA = –40°C to 25°C –8 ±5 8 mV Offset Error VOE IP = 0 A, TA = 25°C to 150°C –4 ±2 4 mV IP = 0 A, TA = –40°C to 25°C –4 ±2 4 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.2 ±0.8 1.2 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –9 ±6 9 mV Power Supply Reference Voltage Output Error VREF_PS VDD(MIN) to VDD(MAX) –9 ±6 9 mV Power Supply Offset Error VOE_PS VDD(MIN) to VDD(MAX) –8 ±5 8 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –3 – 3 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –15 – 15 mV IP = 0 A, TA = –40°C to 25°C –15 – 15 mV Reference Voltage Output Error Including Lifetime Drift VREF_LTD TA = 25°C to 150°C –15 – 15 mV TA = –40°C to 25°C –15 – 15 mV Offset Error Including Lifetime Drift VOE_LTD IP = 0 A, TA = 25°C to 150°C –3 – 3 mV IP = 0 A, TA = –40°C to 25°C –3 – 3 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37010LLZATR-050B3 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –50 – 50 A Sensitivity Sens IPR(min) < IP < IPR(max) – 26.4 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 1.65 – V Reference Voltage Output VREF – 1.65 – V ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±1.1 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±1 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±4 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±4 8 mV Reference Voltage Output Error VREF_E TA = 25°C to 150°C –8 ±4 8 mV TA = –40°C to 25°C –8 ±4 8 mV Offset Error VOE IP = 0 A, TA = 25°C to 150°C –3 ±1.5 3 mV IP = 0 A, TA = –40°C to 25°C –3 ±1.5 3 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.4 ±1.1 1.4 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV Power Supply Reference Voltage Output Error VREF_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV Power Supply Offset Error VOE_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –13 – 13 mV IP = 0 A, TA = –40°C to 25°C –13 – 13 mV Reference Voltage Output Error Including Lifetime Drift VREF_LTD TA = 25°C to 150°C –13 – 13 mV TA = –40°C to 25°C –13 – 13 mV Offset Error Including Lifetime Drift VOE_LTD IP = 0 A, TA = 25°C to 150°C –3 – 3 mV IP = 0 A, TA = –40°C to 25°C –3 – 3 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37012LLZATR-030B5 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –30 – 30 A Sensitivity Sens IPR(min) < IP < IPR(max) – 66.7 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 2.5 – V Overcurrent Threshold IOC – 100 – %IPR Overcurrent Hysteresis IOC_HYS – 2.9 – A FAULT ERROR Overcurrent Error IOC_E –3 – 3 A ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±0.8 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±0.8 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±5 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±5 8 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 8.5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.2 ±0.7 1.2 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –9 ±6 9 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –10 – 10 mV IP = 0 A, TA = –40°C to 25°C –10 – 10 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37012LLZATR-030B3 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –30 – 30 A Sensitivity Sens IPR(min) < IP < IPR(max) – 44 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 1.65 – V Overcurrent Threshold IOC – 100 – %IPR Overcurrent Hysteresis IOC_HYS – 2.9 – A FAULT ERROR Overcurrent Error IOC_E –3 – 3 A ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±1 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±1 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±4 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±4 8 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 8.5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.4 ±1.2 1.4 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –10 – 10 mV IP = 0 A, TA = –40°C to 25°C –10 – 10 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37012LLZATR-050B5 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –50 – 50 A Sensitivity Sens IPR(min) < IP < IPR(max) – 40 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 2.5 – V Overcurrent Threshold IOC – 100 – %IPR Overcurrent Hysteresis IOC_HYS – 4.8 – A FAULT ERROR Overcurrent Error IOC_E –5 – 5 A ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±1.1 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±1.1 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±5 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±5 8 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.2 ±0.8 1.2 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –9 ±6 9 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –3 – 3 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –15 – 15 mV IP = 0 A, TA = –40°C to 25°C –15 – 15 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS37012LLZATR-050B3 PERFORMANCE CHARACTERISTICS: Valid over full operating temperature range, TA = –40°C to 150°C, CBYPASS = 100 nF, and VDD = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –50 – 50 A Sensitivity Sens IPR(min) < IP < IPR(max) – 26.4 – mV/A Quiescent Voltage Output VQVO IP = 0 A – 1.65 – V Overcurrent Threshold IOC – 100 – %IPR Overcurrent Hysteresis IOC_HYS – 4.8 – A FAULT ERROR Overcurrent Error IOC_E –5 – 5 A ERROR COMPONENTS [1] Sensitivity Error ESENS IP = 0.5 × IPR(max), TA = 25°C to 150°C –1.5 ±1.1 1.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –1.5 ±1 1.5 % Quiescent Voltage Output Error VQVO_E IP = 0 A, TA = 25°C to 150°C –8 ±4 8 mV IP = 0 A, TA = –40°C to 25°C –8 ±4 8 mV Noise N TA = 25°C, CL_VOUT = 6 nF, CBYPASS = 1 µF, BW = 450 kHz – 5 – mVRMS Power Supply Sensitivity Error ESENS_PS VDD(MIN) to VDD(MAX) –1.4 ±1.1 1.4 % Power Supply Quiescent Voltage Output Error VQVO_PS VDD(MIN) to VDD(MAX) –6 ±3 6 mV ERROR COMPONENTS INCLUDING LIFETIME DRIFT [2] Sensitivity Error Including Lifetime Drift ESENS_LTD IP = 0.5 × IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = 0.5 × IPR(max), TA = –40°C to 25°C –3.5 – 3.5 % Quiescent Voltage Output Error Including Lifetime Drift VQVO_LTD IP = 0 A, TA = 25°C to 150°C –13 – 13 mV IP = 0 A, TA = –40°C to 25°C –13 – 13 mV [1] Typical values are the mean ±3 sigma of production distributions. [2] Lifetime drift minimum/maximum values are ±3 sigma, and are based on a statistical combination of production distributions and worst-case drift distributions observed after AEC-Q100 qualification stresses.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CHARACTERISTIC PERFORMANCE ACS37010 AND ACS37012 TYPICAL FREQUENCY RESPONSE -3 dB ≈ 450 kHz
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com RESPONSE CHARACTERISTICS DEFINITIONS AND TYPICAL PERFORMANCE DATA Response Time (tRESPONSE) The time interval between a) when the sensed input current reaches 90% of its final value, and b) when the sensor output reaches 90% of its full-scale value. Propagation Delay (tpd) The time interval between a) when the sensed input current reaches 20% of its full-scale value, and b) when the sensor output reaches 20% of its full-scale value. Rise Time (tr) The time interval between a) when the sensor reaches 10% of its full-scale value, and b) when it reaches 90% of its full-scale value. Output Slew Rate (SR) The rate of change [V/µs] in the output voltage from a) when the sensor reaches 10% of its full-scale value, and b) when it reaches 90% of its full-scale value. Response Time, Propagation Delay, Rise Time, and Output Slew Rate Applied current step with 10% to 90% rise time = 1 μs Test Conditions: TA = 25°C, CBYPASS = 1 µF, CL_VOUT = 6 nF tRESPONSE tPD SR [V/μs] tR
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL DESCRIPTION OF POWER ON/OFF OPERATION Introduction To ensure that the device output is reporting accurately, the ACS37010/12 contains an overvoltage and an undervoltage detection flag. This internal flag on VOUT can be used to alert the system when the supply voltage for the device is outside of the operational range by putting the output into a known high-imped- ance (high Z) state. UVD is only active on 5 V devices. The provided graphs in this section show VOUT moving with VDD. The voltage of VOUT during a high-impedance state will be most consistent with a known load (RL_VOUT, CL_VOUT). All fig- ures below all use the same labeling scheme for different power thresholds. References in brackets “[ ]” are valid for each of these plots. Note: when VREF is mentioned, this only applies to the ACS37010. POWER-ON OPERATION UVD Enabled When UVD is enabled, as VDD ramps up, the AC37010 VOUT and VREF pins are high Z until VDD reaches and passes VUVD [2]. Once VDD passes [2], the device takes some time without VDD dropping below VPOR – VPOR_HYS [8] before the device enters normal operation. UVD Disabled When UVD is disabled, as VDD ramps up, the AC37010 VOUT and VREF pins are high Z until VDD reaches and passes VPOR [1]. Once VDD has passed VPOR [1], VOUT enters normal operation. POWER-OFF OPERATION UVD Enabled When UVD is enabled, before the device powers off, it will force VOUT to GND if VDD reaches less than VUVD – VUVD_HYS [6]. When VPOR – VPOR_HYS [8] is reached, VOUT and VREF will go high Z. UVD Disabled When UVD is disabled, VREF and VOUT continue to report until VDD is less than VPOR – VPOR_HYS [8], at which point,VOUT and VREF will enter a high Z state. NOTE: Because the device is entering a high Z state and not driv- ing the output, the time it takes the output to reach a steady state will depend on the external circuitry used. Voltage Thresholds POWER-ON RESET RELEASE VOLTAGE(V POR) If VDD falls below VPOR – VPOR_HYS [8] while in operation, the digital circuitry turns off and the output will re-enter a high Z state. After VDD recovers and exceeds VUVD [2], the output will begin reporting again after the delay of tPO. UNDERVOLTAGE DETECTION THRESHOLD (V UVD) The 5 V devices are factory-programmed with UVD enabled. It is important to note that, when powering up the device for the first time after a Power-On Reset event, VOUT and VREF will remain high Z until VDD is raised above VUVD [2], at which point the VOUT and VREF outputs will begin to resume normal operation. If UVD is disabled or it is a 3.3 V device, VOUT and VREF will begin normal operation after VDD raises above VPOR [1] under the same conditions. If VDD drops below VUVD – VUVD_HYS [6] after normal opera- tion, VOUT will pull to GND regardless of RL_VOUT configura- tion. The VOUT will remain at GND until VDD raises above VUVD [7] or VDD falls below VPOR – VPOR_HYS [8]. If VDD rises above VUVD [7] after a UVD event, the VOUT and VREF outputs will resume operation. If VDD drops below VPO – VPOR_HYS [8], the device will enter a POR event and reset; VOUT and VREF will switch to high Z if this occurs. OVERVOLTAGE DETECTION THRESHOLD (V OVD) When VDD raises above VOVD [4], the output of the VOUT pin will go high Z, VREF be pulled to GND, and VOUT will be pulled to either VDD or GND, depending on the configuration (pull-up vs. pull-down) of RL_VOUT. OVERVOLTAGE/UNDERVOLTAGE DETECTION HYSTERESIS (V OVD_HYS , VUVD_HYS ) There is hysteresis between enable and disable thresholds to reduce nuisance flagging and clears.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com High Z High Z High Z High Z High Z High Z High Z Time Voltage 2 3 5 6 7 8 VDD VOUT 1 1 87 6 VREF VREF 1 4 5 6 7 6 78 6 8 Time Voltage VDD VUVD VPOR VQVO VOVD – VOVD VOVD_HYS VUVD – VUVD_HYS VPOR – VPOR_HYS Figure 4: Power States Thresholds with VOUT and VREF Behavior, 5 V Device, RL_VOUT = Pull-Up, UVD Enabled High Z High Z High Z High Z Time Voltage VDD VUVD VPOR VQVO VOVD – VOVD 2 3 5 6 7 8 VDD VOUT 1 1 VOVD_HYS VUVD – VUVD_HYS VPOR – VPOR_HYS High Z High Z High Z VREF VREF 1 4 5 6 7 6 78 6 8 Time Voltage Figure 5: Power States Thresholds with VOUT Behavior for a 5 V Device, RL_VOUT = Pull-Down, UVD Enabled
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com High Z High Z High Z High ZHigh ZHigh Z High Z Time Voltage 5 V VDD VOUT 1 1 VREF VREF(Ideal) 4 5 8 8 Time Voltage 1 3.3 V VPOR VQVO VOVD – VOVD VOVD_HYS VPOR – VPOR_HYS Figure 6: Power States Thresholds with VOUT and VREF Behavior, 3.3 V Device, RL = Pull-Up, UVD Disabled
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Time High Z VDD VOUT Voltage VDD VUVD VPOR VQVO tPO A Figure 7: tPO behavior UVD enabled, RL_VOUT = Pull-Up Timing Thresholds POWER-ON DELAY ( tPO) When the supply is ramped to VUVD [2], the device will require a finite time to power its internal components before the outputs are released from high Z and can respond 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, which can be seen as the time from [2] to [A] in Figure 7. After this delay, the output will quickly approach VOUT(IP) = Sens × IP + VREF. OVERVOLTAGE AND UNDERVOLTAGE DETECTION TIME AND DETECTION RELEASE TIME (tOVD/tOVD_R, tUVD/tUVD_R) The enable time for OVD, tOVD, is the time from VOVD [4] to OVD flag [B]. The UVD enable time, tUVD, is the time from VUVD – VUVD_HYS [6] to the UVD flag [D]. If VDD ramps from >VUVD – VUVD_HYS [6] to <VPOR – VPOR_HYS [8] faster than tUVD, then the device will not have time to report a UVD event before power off occurs. The detection release time for OVD, tOVD_R, is the time from VOVD – VOVD_HYS [5] to the OVD clear to normal operation [C]. The UVD disable time, tUVD_R, is the time from VUVD [7] to the point that the UVD flag clears and VOUT returns to nominal operation [E]. The disable time does not have a counter for either OVD or UVD to release the output and resume reporting. Time High Z VDD VOUT Voltage V VQVO POR VDD tPO A Figure 8: tPO behavior UVD disabled, RL_VOUT = Pull-Up Figure 9: tPO, and tOVD/tOVD_R, and tUVD/tUVD_R with RL_VOUT = Pull-Up High Z High Z Time Voltage VDD VOUT t B t A t C t E t D VDD VUVD VPOR VQVO VOVD – VOVD VOVD_HYS VUVD – VUVD_HYS VPOR – VPOR_HYS OVDPO OVD_R UVD_RUVD
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEFINITIONS OF OPERATING AND PERFORMANCE CHARACTERISTICS Quiescent Voltage Output (VQVO) Quiescent V oltage Output, or VQVO, is defined as the voltage on the output, VOUT, when zero amps are applied through IP. Quiescent Voltage Output Error(VQVO_E) Quiescent V oltage Output Error, or VQVO_E, is defined as the drift of VQVO from room to hot or room to cold (25°C to 150°C or 25°C to –40°C, respectively). To improve overtemperature performance, the temperature drift is compensated with Allegro factory trim to remain within the limits across temperature. Reference Voltage Output (VREF) The Reference V oltage Output, or VREF, reports the quiescent volt- age output for the output channel, VOUT. The internally generated VREF is used in a pseudo-differential mode to remove errors due to the reference shifts or noise on the ground line. Reference Voltage Temperature Drift (VREF_E) Reference V oltage Output Error, or VREF_E, is defined as the drift of VREF from room to hot or room to cold (25°C to 150°C or 25°C to –40°C, respectively). Offset Error (VOE) Offset Error, or VOE, is defined as the difference between VQVO and VREF. VOE includes VQVO_E – VREF from room to hot or room to cold (25°C to 150°C or 25°C to –40°C, respectively). Output Saturation Voltage (VSAT_H /VSAT_L) Output Saturation V oltage, or VSAT, is defined as the voltage that the VOUT does not pass as a result of an increasing magnitude of current. VSAT_H is the highest voltage the output can drive to, while VSAT_L is the lowest. Note that changing the sensitivity does not change the VSAT points. Sensitivity (Sens) Sensitivity, or Sens, is the ratio of the output swing versus the applied current through the primary conductor, IP. This current causes a voltage deviation away from VQVO on the VOUT output until VSAT. The magnitude and direction of the output volt- age swing is proportional to the magnitude and direction of the applied current. This proportional relationship between output and input is Sensitivity and is defined as: Sens = IP1 – IP2 VOUT(IP1) – VOUT(IP2) where IP1 and IP2 are two different currents, and where VOUT(IP1) and VOUT(IP2) are the voltages of the device at those applied cur- rents. Sensitivity Error (ESENS) Sensitivity Error, or ESENS, is the error of Sensitivity from room to hot or room to cold (25°C to 150°C or 25°C to –40°C, respec- tively). Sensitivity error is compensated with Allegro factory trim. Error Components Including Lifetime Drift (ESENS_LTD/VQVO_LTD/VREF_LTD/VOE_LTD) Lifetime drift characteristics are based on a statistical combina- tion of production distributions and worst-case distribution of parametric drift of individuals observed during AEC-Q100 quali- fication. Solder reflow induces stress on the ACS37010/2 device causing parametric shifts and lifetime drift limits apply immedi- ately after solder reflow as well as long term use. Power Supply Sensitivity Error (ESENS_PS) Power Supply Sensitivity Error, or ESENS_PS, is defined as the percent sensitivity error measured between VDD and VDD ±10%. For a 5 V device, this is 5 to 4.5 V and 5 to 5.5 V . For a 3.3 V device, this is 3.3 to 3 V and 3.3 to 3.6 V . Power Supply Offset Error (VOE_PS) Power Supply Offset Error, or VOE_PS, is defined as the offset error in mV between VDD and VCC ±10% VDD. For a 5 V device, 3 V and 3.3 to 3.6 V .
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com OVERCURRENT FAULT (OCF) BEHAVIOR Hi Z Hi ZHi Z Vpull-up IOC IOC I OC_HYST|Current| GND GNDVOCF OC_HYST–I Figure 10: Fault Thresholds and OCF Pin Functionality The overcurrent fault (OCF) function (ACS37012 only) pulls the open-drain FAULT pin low when the applied current exceeds a preset threshold (IOCR). On the ACS37012, this threshold is inter- nally set to 100% of the fullscale rated current. This flag trips symmetrically for positive and negative applied currents. The implementation for the OCF circuitry is accurate over tem- perature and does not require further temperature compensation. OVERCURRENT ERROR (I OC_E) Overcurrent Error, or IOC_E, is the error between the ideal IOC and the measured IOC. OVERCURRENT HYSTERESIS (I OC_HYS ) Overcurrent Hysteresis, or IOC_HYST, is defined as the magni- tude of current in percentage of the FS that must drop before a fault assertion will be cleared. This can be seen as the separation between the voltages [9] to [10] in Figure 10. OVERCURRENT FAULT RESPONSE TIME ( tOC_RESP ) Overcurrent Response Time, or tOC_RESP, is defined as the time from when the input reaches the operating point [9] until the OCF pin falls below VFAULT_L [G]. tOC_RESP G J IOC IOC – Amps Voltage on FAULT pin tOC_RESP IOC_HYS Figure 11: Fault Hold with Clear Fault After Hold Time
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com THERMAL PERFORMANCE Thermal Rise vs. Primary Current Self-heating due to the flow of current in the package IP conduc- tor should be considered during the design of any current sensing system. The sensor, printed circuit board (PCB), and contacts to the PCB will generate heat and act as a heat sink as current moves through the system. The thermal response is highly dependent on PCB layout, cop- per thickness, cooling techniques, and the profile of the injected current. The current profile includes peak current value, current “on-time”, and duty cycle. Placing vias under the copper pads of the Allegro current sen- sor evaluation board minimizes the current path resistance and improves heatsinking to the PCB, while vias outside of the pads limit the current path to the top of the PCB trace and have worse heatsinking under the part (see Figure 12 and Figure 13). Current Sensor die Polyimide Tape Figure 12: Vias Under Copper Pads, LZ Package Current Sensor die Polyimide Tape Figure 13: No Vias Under Copper Pads, LZ Package The plot in Figure 14 shows the measured rise in steady-state die temperature of the ACS37010/2 versus DC continuous current at an ambient temperature, TA, of 25°C for two board designs: filled vias under copper pads and no vias under copper pads. Note the thermal offset curves may be directly applied to other values of TA. Using in-pad vias has better thermal performance than no in-pad vias. 100 125 150 100 Die Temp Change from Room Temp DC Continuous Current LZ Comparison Via Outside Pad Via In Pad Figure 14: LZ Package Comparison with and without In- Pad Vias The thermal capacity of the ACS37010/2 should be verified by the end user in the application’s specific conditions. The maximum junction temperature, TJ(max) (165℃), should not be exceeded. Measuring the temperature of the top of the package is a close approximation of the die temperature. Evaluation Board Layout Thermal data shown in Figure 14 was collected using the ASEK37010 Evaluation Board (TED-0004110, LC/LZ Current Sensor Evaluation Board). This board includes six layers. The ASEK37010 evaluation board is shown in Figure 12. Figure 15: LZ Package Allegro Evaluation Board Gerber files for the ASEK37010 evaluation board are available for download from the Allegro website. See the technical docu- ments section of the ACS37010/2 webpage.
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com PACKAGE OUTLINE DRAWING Figure 16: Custom 6-Pin SOIC (Suffix LZ) For Reference Only – Not for Tooling Use (Reference DWG-0000385, Rev. 1) NOT TO SCALE Dimensions in millimeters Dimensions exclusive of moldfl ash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown PRELIMINARY 4.890 ±0.090 (0.34) 1.27 BSC (0.34)
2.54 BSC
4 × 0.40 ±0.05 A 6.00 ±0.20 3.900 ±0.090 0.375 ±0.125 B A
0.25 M C A B
(0.68) 1.47 ±0.100 Seating Plane 2 × 1.67 ±0.05 4 × 9° ±2° C C0.10 Detail A (3:1) (0.11) 4°±4° 0.68 ±0.25 0.25 BSC
1.05 BSC
(R0.2) (R0.4) 0.175 ±0.075 PCB Layout Reference View 2.54 1.92 1.58 4.20 5.78 0.65 1.27 1.58 0.81 1.48 0.33 0.47 1.95 2.45 Standard Branding Reference View NNNNNNNN DDDD LLLLLLLL N = Device Part Number D = Date Code L = Assembly Lot Number Figure 17: LZ Package Branding
450 kHz, High Accuracy Current Sensor With FAULT or Reference Output in SOIC-6 Package ACS37010 and ACS37012 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com For the latest version of this document, visit our website: www.allegromicro.com Copyright 2023, 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.
Revision History
– March 13, 2023 Initial release 1 March 29, 2023 Updated Error Components Including Lifetime Drift sections of Performance Characteristic tables (Pages 7, 8)