MAX9921AUB+

Sensor And Detector Interfaces Overview

The MAX9921AUB+ is a dual, 2-wire Hall-effect sensor interface IC designed for automotive applications. It operates within a supply voltage range of 6V to 18V and withstands up to 60V transients at the BAT supply. The device supplies current to two Hall sensors, monitors their current levels, and provides logic outputs corresponding to the sensor states. It features comprehensive diagnostics for open inputs, battery shorts, and ground shorts, with an error output (ERR) indicating fault conditions. The IC includes input filtering, blanking times following power-up, and low-power shutdown capabilities controlled by OE and DIAG pins.

Sensor And Detector Interfaces Feature Summary

• Provides dual channel interface for 2-wire Hall-effect sensors with integrated current monitoring and logic translation.
• Includes robust diagnostic functions detecting open circuits, short-to-battery, and short-to-ground faults via ERR output.
• Offers protection against supply transients up to 60V and manages Hall sensor power-up sequences with configurable blanking.
• Supports multiplexing through Output Enable (OE) and allows diagnostic mode switching via the DIAG pin.

Sensor And Detector Interfaces Applications

• Door modules
• Window lifters
• Seat movers
• Electric sunroofs
• Powered lift gate controllers

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix to confirm package type and reel configuration. The 'A' indicates temperature grade, 'UB' denotes the 10-pin µMAX package, '+' signifies lead-free/RoHS compliance, and absence of 'T' implies tube packaging. Confirm availability status as distribution channels may vary. Ensure compatibility with automotive environmental requirements specified in the datasheet.

Sensor And Detector Interfaces Selection Notes

Select this component when interfacing dual 2-wire Hall-effect switches requiring integrated current sourcing and fault detection. Ensure the external ISET resistor value matches the desired current thresholds for the specific Hall sensors used. Verify that the application environment falls within the -40°C to +125°C operating temperature range. Consider the 10-pin µMAX package constraints for PCB layout and thermal dissipation.

Sensor And Detector Interfaces Part Context

The MAX9921 belongs to the Maxim Integrated (now Analog Devices) family of sensor interface devices. It is specifically engineered for automotive body electronics where reliable sensing of mechanical positions is critical. The device simplifies system design by integrating current regulation, filtering, and diagnostic logic into a single small footprint, reducing the need for external components typically required for sensor conditioning.

Sensor And Detector Interfaces Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Designers should evaluate other dual-channel Hall interfaces from Analog Devices or competitors based on pinout compatibility, current threshold specifications, and diagnostic feature sets if replacement is necessary.