A1367: Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC with Regulated Supply, Advanced Temperature Compensation, and High-Bandwidth (240 kHz) Analog Output

The Allegro™ A1367 programmable linear Hall-effect current sensor IC has been designed to achieve high accuracy and resolution without compromising bandwidth. This goal is achieved through new proprietary linearly interpolated temperature compensation technology that is programmed at the Allegro factory and provides sensitivity and offset that are virtually flat across the full operating temperature range.

Temperature compensation is performed in the digital domain with integrated EEPROM technology while maintaining a 240 kHz bandwidth analog signal path, making this device ideal for HEV inverter, DC-to-DC converter, and electric power steering (EPS) applications.

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 0.6 to 6.4 mV/G.

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 also are built into this device for high reliability in automotive applications.

Device parameters are specified across an extended ambient temperature range: –40°C to 150°C. The A1367 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.

• 240 kHz nominal bandwidth achieved via proprietary packaging and chopper stabilization techniques
• On-board supply regulator with reverse-battery protection
• Proprietary segmented linear temperature compensation (TC) technology provides a typical accuracy of 1% over the full operating temperature range
• Customer-programmable, high-resolution offset and sensitivity trim
• Factory-programmed sensitivity and quiescent output voltage TC with extremely stable temperature performance
• High-sensitivity Hall element for maximum accuracy
• 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
• Open circuit detection on ground pin (broken wire)
• Selectable sensitivity range between 0.6 and 6.4 mV/G through use of coarse sensitivity program bits
• 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
• 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
• AEC-Q100 automotive qualified