General Description
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 (FP) 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.

FEATUREs
✦ 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
✦ensor and the MAX9621
✦ ±2kV Human Body Model ESD and ±200V Machine
   Model ESD at All Pins
✦ 3mm x 5mm, 10-Pin µMAX Package

APPLICATIONs
   Window Lifters
   Seat Movers
   Electric Sunroofs
   Seatbelt Buckles
   Door Power Locks
   Ignition Key
   Steering Column
   Speed Sensing