ACS70310: Highest Accuracy Programmable Linear Hall-Effect Sensor IC with Reverse Battery Protection and 240 kHz Bandwidth Output for Core-Based Current Sensing

The ACS70310 provides the highest accuracy current sensor IC for core-based current sensing ever offered from Allegro. This sensor is a programmable linear Hall-effect current sensor IC that has been designed to achieve industry leading accuracy and resolution without compromising bandwidth. Allegro programming provides a sensitivity of +/-1.2% and zero-amp output voltage offset of only +/-5mV over the operating temperature range of -40C to 150C. Temperature compensation is performed in the digital domain with integrated EEPROM technology which allows the sensor to maintain a 2uS response time and 240 kHz bandwidth analog signal path, making this device ideal for HEV inverter, DC-to-DC converter, and electric power steering (EPS) applications.

The on-chip regulator provides reverse battery protection and high immunity to electrical overstress on the supply voltage line. This ratiometric Hall-effect sensor IC provides a voltage output that is proportional to the applied magnetic field. The customer can configure the sensitivity and quiescent (zero field) output voltage through programming on the VCC and output pins to optimize performance in the end application. The quiescent output voltage is user-adjustable, around 50% (bidirectional configuration) or 10% (unidirectional configuration) of the supply voltage, VCC, and the output sensitivity is adjustable within the range of 0.5 to 11.5 mV/G. Ratiometry of the output is also programmable and can be disabled.

The sensor IC incorporates a highly sensitive Hall element with a BiCMOS interface integrated circuit that employs a low-noise, small-signal, high-gain amplifier, a clamped low-impedance output stage, and a proprietary, high-bandwidth dynamic offset cancellation technique. These advances in Hall-effect technology work together to provide an industry-leading sensing resolution at the full 240 kHz bandwidth. Broken ground wire detection as well as user-selectable output voltage clamps enhance reliability in safety critical automotive applications.

Device parameters are specified across an extended ambient temperature range: –40°C to 150°C. The ACS70310 sensor IC is provided in an extremely thin case (1 mm thick), 4-pin SIP (single in-line package, suffix KT) that is lead (Pb) free, with 100% matte-tin leadframe plating.

• Factory-programmed segmented linear temperature compensation (TC) provides ultralow thermal drift
  • Sensitivity ±1%
  • Offset ±5 mV
• On-board supply regulator with reverse-battery protection provides high immunity to Electrical Overstress (EOS)
• Very fast response time (2 μs)
• High operating bandwidth: DC to 240 kHz
• AEC-Q100 Grade 0, automotive qualified
• Customer-programmable, high-resolution offset, and sensitivity trim
• Extremely low noise and high resolution achieved via proprietary Hall element and low-noise amplifier circuits
• Patented circuits suppress IC output spiking during fast current step inputs
• Wide selectable sensitivity range between 0.5 and 11.5 mV/G
• User-selectable ratiometric behavior of sensitivity, quiescent voltage, and clamps (ratiometry can be disabled), for simple interface with application A-to-D converter (ADC)
• Precise recoverability after temperature cycling
• Open circuit detection on ground pin (broken wire)
• Customer programmable Output Voltage Clamps provide short-circuit diagnostic capabilities
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Extremely thin package: 1 mm case thickness