MAX9621

PRODUCTION

Dual, 2-Wire Hall-Effect Sensor Interface with Analog and Digital Outputs

Provides Flexibility and Saves Cost in Automotive Applications

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • Provides Supply Current and Interfaces to Two 2-Wire Hall-Effect Sensors
  • 5.5V to 18V Operating Voltage Range
  • Protects Hall Sensors Against Up to 60V Supply Transients
  • Low-Power Shutdown for Power Saving
  • Filtered Digital Outputs
  • Analog Output Mirrors the Hall Sensor Current
  • Hall Inputs Protected from Short to Ground
  • Hall Sensor Blanking Following Power-Up and Restart from Shutdown and Short to Ground
  • Operates with ±3V Ground Shift Between the Hall Sensor and the MAX9621
  • ±2kV Human Body Model ESD and ±200V Machine Model ESD at All Pins
  • 3mm x 5mm, 10-Pin µMAX Package

The MAX9621 is a continuation of the Maxim family of Hall-effect sensor interfaces that already includes the MAX9921. The MAX9621 provides a single-chip solution to interface two 2-wire Hall-effect sensors to low voltage microprocessors (µP) through either a digital output for Hall-effect switches or an analog output for linear information or both.

The MAX9621 protects the Hall sensors from supply transients up to 60V at the BAT supply. Normal operating supply voltage ranges from 5.5V to 18V. If the BAT supply rises above 18V, the MAX9621 shuts off the current to the Hall sensors. When a short-to-ground fault condition is detected, the current to the Hall input is shut off and the condition is indicated at the analog output by a zero-current level and a high digital output.

The MAX9621 provides a minimum of 50µs blanking time following Hall sensor power-up or restart. The open-drain digital outputs are compatible with logic levels up to 5.5V.

The MAX9621 is available in a 3mm x 5mm, 10-pin µMAX® package and is rated for operation in the -40°C to +125°C temperature range.

Applications

  • Door Power Locks
  • Electric Sunroofs
  • Ignition Key
  • Seat Movers
  • Seatbelt Buckles
  • Speed Sensing
  • Steering Column
  • Window Lifters
MAX9621
Dual, 2-Wire Hall-Effect Sensor Interface with Analog and Digital Outputs
MAX9621: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Amplifier-Based Front Ends 1
MAX9921
PRODUCTION Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics
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Tools & Simulations

SPICE Model 2

Evaluation Kits

MAX9621EVKIT

Evaluation Kit for the MAX9621

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Features and Benefits

  • 5.5V to 18V Operating Voltage Range
  • Up to 60V Fault Protection
  • Features Two On-Board 2-Wire Hall-Effect Sensors
  • Evaluates Sensor Short-to-Ground Fault Conditions
  • Demonstrates Adjustable Input Current Threshold
  • Demonstrates Analog Output Feature
  • Two Digital Output Status LED Indicators
  • Demonstrates Reverse-Supply Protection
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX9621 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the MAX9621 dual, 2-wire Hall-effect sensor interface with analog and digital outputs in a 10-pin µMAX® surface-mount package. The EV kit features two on-board analog Hall-effect sensors, demonstrates BAT supply pin isolation, and digital logic for driving status LEDs. Input power to the EV kit circuit can be supplied by a 5.5V to 18V DC source.

The MAX9621 EV kit circuit can be configured to demonstrate the MAX9621's Hall input short-to-ground and 60V fault-protection feature. The EV kit also demonstrates the MAX9621's analog output and filtered digital output features for each sensor input. The EV kit's PCB features an 8-pin, dual-row header to facilitate interfacing with a user's external system.

Applications

  • Door Power Locks
  • Electric Sunroofs
  • Ignition Key
  • Seat Movers
  • Seatbelt Buckles
  • Speed Sensing
  • Steering Column
  • Window Lifters
MAX9621EVKIT
Evaluation Kit for the MAX9621

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