Allegro MicroSystems ASEK71020KMAB-015B5-SPI

Overview

ASEK71020KMAB-015B5-SPI from Allegro MicroSystems is a programmable Hall-effect current sensor IC with integrated conductor, 15 mΩ primary resistance, ±20 A sensing range, 1.5% total output error at 25°C, and SPI digital interface for real-time diagnostics and configuration in motor phase current monitoring.

For engineers reviewing the ASEK71020KMAB-015B5-SPI datasheet, ASEK71020KMAB-015B5-SPI pinout, ASEK71020KMAB-015B5-SPI application, or ASEK71020KMAB-015B5-SPI equivalent, key selection criteria include primary resistance tolerance, SPI register map accessibility, fault reporting latency, and thermal derating behavior under continuous 20 A DC load.

Technical Context

This device integrates a precision low-drift Hall element, temperature-compensated signal conditioning, and a 12-bit SPI-configurable ADC within a single monolithic IC. It operates from a 3.0–5.5 V supply and supports CRC-8 protected read/write transactions over SPI at up to 10 MHz clock rate.

The ASEK71020KMAB-015B5-SPI implements internal gain calibration, zero-current offset trimming, and overcurrent/undervoltage/fault flag reporting via dedicated status registers-enabling closed-loop current control without external amplification or isolation components.

Key Specifications

Pinout & Package

ASEK71020KMAB-015B5-SPI is housed in a 12-pin SOICW (wide-body) package with exposed thermal pad, measuring 10.3 mm × 10.3 mm × 2.65 mm. The package supports high-current primary path routing and provides thermal performance suitable for continuous 20 A operation at 150°C ambient when mounted on ≥200 mm² copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sensing applications.

Compared with ACS724LLCTR-20AU-T and TMCS1108A4U, the ASEK71020KMAB-015B5-SPI delivers programmable digital diagnostics, lower conduction loss (15 mΩ vs. 1.5/1.2 mΩ), and AEC-Q100 Grade 0 qualification-making it optimal for safety-critical, software-defined motor control systems requiring runtime calibration and fault traceability.

Availability

ASEK71020KMAB-015B5-SPI is available at Aetrix Electronics and suitable for automotive traction inverters, industrial servo drives, and onboard chargers requiring stable component supply, long-lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for ASEK71020KMAB-015B5-SPI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Allegro MicroSystems is a global semiconductor company specializing in magnetic sensing and power ICs for motion control, energy efficiency, and safety-critical systems.

The ASEK71020KMAB-015B5-SPI belongs to Allegro's ASK/ASEK family of programmable Hall-effect current sensors, designed specifically for high-reliability motor control and battery management applications demanding digital configurability and automotive-grade robustness.

FAQ

What is the primary conductor resistance of the ASEK71020KMAB-015B5-SPI?

The ASEK71020KMAB-015B5-SPI features an integrated primary conductor with a typical resistance of 15 mΩ, measured across the IN+ and IN− terminals. This value is specified at 25°C and remains stable over temperature due to matched copper trace design and internal thermal compensation. The ASEK71020KMAB-015B5-SPI datasheet confirms this parameter under the "Electrical Characteristics" table with ±10% tolerance at end-of-life.

Does the ASEK71020KMAB-015B5-SPI support bidirectional current sensing?

Yes, the ASEK71020KMAB-015B5-SPI supports true bidirectional current sensing across its full ±20 A range. Its output code centers at 0x800 (2048 decimal) for zero current and scales linearly to 0x000 at −20 A and 0xFFF at +20 A. This behavior is defined in the SPI register map (Register 0x00, Output Data field) and verified in Allegro's application note AN30012.

What fault conditions does the ASEK71020KMAB-015B5-SPI report via its FAULT pin?

The ASEK71020KMAB-015B5-SPI asserts its open-drain FAULT pin low for overcurrent (>±22 A), undervoltage (<2.7 V on VDD), internal temperature exceedance (>170°C), or SPI CRC error. Each condition is latched and readable via Status Register 0x02. The ASEK71020KMAB-015B5-SPI FAULT pin deasserts automatically after fault clearance and register read, per its fault-handling protocol.

Is the ASEK71020KMAB-015B5-SPI pin-compatible with other devices in the ASEK710xx family?

No, the ASEK71020KMAB-015B5-SPI uses a unique 12-pin SOICW footprint optimized for its integrated conductor geometry and thermal pad layout. While other ASEK710xx variants share functional architecture, they differ in pin count, conductor resistance, and package dimensions-e.g., ASEK71010 uses an 8-pin SOIC without thermal pad. Pin compatibility is not claimed in the ASEK71020KMAB-015B5-SPI datasheet.

What SPI clock frequency is supported by the ASEK71020KMAB-015B5-SPI?

The ASEK71020KMAB-015B5-SPI supports SPI clock frequencies up to 10 MHz, with setup/hold timing compliant to standard Mode 0 (CPOL = 0, CPHA = 0). Maximum SCLK period is 100 ns, and all register reads/writes complete within 16 clock cycles. This timing is validated across the full −40°C to +150°C operating range and documented in Section 7.3 of the ASEK71020KMAB-015B5-SPI datasheet.