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Hall effect chip integrates power, voltage, and current monitoring

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By Nick Flaherty





Allegro MicroSystems has launched a highly integrated Hall effect power monitoring chip for single-phase AC and DC systems.

The ACS37800 allows simultaneous measurement of power, voltage, and current for AC and DC signals with an isolation rating of up to 1480 Vpk in a small SOIC16W package, reducing the solution BOM size, cost, and complexity.

“Our newest power monitoring chip is a gamechanger for IoT devices, smart lighting, data centers, and telecom applications, in particular,” said Shaun Milano, Business Unit Director for Current Sensors at Allegro. “We’ve improved on our first-generation integrated solution by adding the ability to measure voltage, current and power in AC as well as DC at the same time – and with reinforced isolation, our customers can eliminate many expensive components on their PCBs. The ACS37800 dramatically simplifies measuring power in a unique single-chip solution.”

The ACS37800 uses the Hall effect to allow devices to easily track power consumption and to optimise energy use by detecting reduced power efficiency for predictive maintenance. This makes the ACS37800 suitable for motor control, building automation, and a variety of green industrial applications.

The SOIC16 footprint reduces PCB size and significantly reduces bill of materials (BOM) cost and complexity by eliminating the need for many components that competitive solutions require in similar conditions. For example, the integrated 517 Vrms reinforced isolation enables current sensing without expensive opto-isolators, Rogowski coils, oversized current transformers, isolated operational amplifiers, or shunt resistors.

The onboard regulator means the ACS37800 can be powered from the same voltage supply as the system microprocessor (5 V or 3.3 V).

The ACS37800 simplifies common power triangle measurements by calculating parameters such as the active, reactive, and apparent power as well as instantaneous and RMS values of the current, voltage, or power. It can average these parameters with many instantaneous measurements over a one minute period, avoiding inaccuracies when waveforms are asymmetric. These features reduce the reliance on microcontroller unit (MCU) resources for critical calculations.

The Hall effect monitor allows designers to choose from a factory-programmed I2C or SPI interface, depending on whether the user prefers low noise or multiple addressing. In I2C mode, it provides zero-crossing detection pinout, simplifying LED dimming control. Users can also program thresholds for under/overvoltage, current/voltage gain and offset, and overcurrent trip point via EEPROM, allowing them to optimise their system from ±30 A to ±180 A and from –40°C to 125°C.

Factory programming of sensitivity and offset with vast user programmability allows designers to balance between time-to-market and customisation in the increasingly competitive energy-efficient applications, such as smart lighting, smart appliances and smart plugs, industrial motor control and server and telecom power supplies.

allegromicro.com/currentsensors

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