MAX9621AUB/V+

Sensor And Detector Interfaces Overview

The MAX9621AUB/V+ is a dual-channel interface for 2-wire Hall-effect sensors, designed to connect to low-voltage microprocessors. It operates on a BAT supply voltage ranging from 5.5V to 18V and withstands transients up to 60V. The device provides open-drain digital outputs (DOUT) and analog current outputs (AOUT) that mirror sensor currents with a nominal gain of 0.05mA/mA. It features a low-power shutdown mode consuming as little as 1µA and includes protection against short-to-ground faults. The component is housed in a 10-pin µMAX package and is qualified for automotive applications.

Sensor And Detector Interfaces Feature Summary

• Interfaces two independent 2-wire Hall-effect sensors with simultaneous digital and analog output channels
• Provides robust protection against supply transients up to 60V and short-to-ground fault conditions
• Features active-low sleep mode for significant power reduction during idle periods
• Immune to ground shifts between the sensor and the microprocessor

Sensor And Detector Interfaces Applications

• Window lifters
• Seat movers
• Electric sunroofs
• Seatbelt buckles
• Door power locks

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix '/V' indicates automotive qualification status. Confirm the '+ denotes lead-free compliance. Ensure the ordering code matches the required 10-pin µMAX package configuration. Check for any regional distribution restrictions or specific manufacturing lot requirements before finalizing procurement.

Sensor And Detector Interfaces Selection Notes

Select this part when interfacing dual 2-wire Hall sensors requiring both logic-level switching and analog monitoring. The '/V' suffix is necessary for automotive-grade reliability standards. Consider the 10-pin µMAX footprint constraints and verify that the operating temperature range meets the -40°C to +125°C requirement for the intended environment.

Sensor And Detector Interfaces Part Context

This component belongs to the Maxim Integrated family of Hall-effect sensor interfaces, continuing the lineage of devices like the MAX9921. It is specifically engineered for high-side current sensing applications where ground shift immunity is critical. The device simplifies system design by integrating sensor powering, protection, and signal conditioning into a single compact package.

Sensor And Detector Interfaces Replacement Considerations

The MAX9621AUB+ serves as the standard commercial version without the automotive qualification suffix. Designers should verify if the '/V' automotive rating is strictly required for their application before substituting with the non-qualified variant.

Sensor And Detector Interfaces FAQ

How does the MAX9621 handle short-to-ground faults at the Hall inputs?

Upon detecting a short-to-ground, the device shuts off current to the affected Hall input and sets the analog output to zero current. The digital output goes high-impedance. The input can be restarted by cycling the SLEEP pin low for 10µs to 20µs.

What is the function of the ISET pin?

The ISET pin allows adjustment of the input current thresholds for the digital outputs. Connecting a resistor (RSET) between BAT and ISET sets the desired threshold range, which also inversely affects parameters like hysteresis, blanking time, and maximum frequency.

Can the MAX9621 operate with 3-wire Hall-effect sensors?

Yes, it can interface with 3-wire Hall switches configured as 2-wire devices. A resistor is typically added to ensure the sensor current crosses the MAX9621's current threshold when the magnetic field exceeds the sensor's limit.