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 (µP) through either a digital output for

Hall-effect switches or an analog output for linear informa-

tion 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 -40ºC to

+125ºC temperature range.

Applications

● Window Lifters

● Seat Movers

● Electric Sunroofs

● Seatbelt Buckles

● Door Power Locks

● Ignition Key

● Steering Column

● Speed Sensing

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

Sensor and the MAX9621

● ±2kV Human Body Model ESD and ±200V Machine

Model ESD at All Pins

● 3mm x 5mm, 10-Pin μMAX Package

Typical Application Circuit appears at end of data sheet.

μMAX is a registered trademark of Maxim Integrated Products, Inc.

19-5024; Rev 2; 2/20

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

/V denotes an automotive qualified part.

PART

TEMP RANGE

PIN-PACKAGE

MAX9621AUB+T

-40ºC to +125ºC

10 µMAX

MAX9621AUB/V+

-40ºC to +125ºC

10 µMAX

BAT

REFERENCE

SLEEP-MODE

CONTROL

FILTER

AOUT1

10kΩ

AOUT2

DOUT1

INPUT

SHORT

DETECTION

ISET

IN1

REF

REF

BAT

BAT

MAX9621

SLEEP

FILTER

DOUT2

IN2

REF

GND

MAX9621

Dual, 2-Wire Hall-Effect Sensor Interface

with Analog and Digital Outputs

Functional Diagram

Ordering Information

EVALUATION KIT AVAILABLE

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here for production status of specific part numbers.