Rainbow Electronics MAX9621 User Manual

General description, Applications, Features

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Dual, 2-Wire Hall-Effect Sensor Interface with

Analog and Digital Outputs

MAX9621

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 infor-
mation 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 sup-
ply 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 50Fs 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
F

MAX

package and is rated for operation in the -40NC

to +125NC 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

19-5024; Rev 0; 11/09

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.

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

Functional Diagram

Typical Application Circuit appears at end of data sheet.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX9621AUB+T

-40NC to +125NC

10 FMAX

BAT

REFERENCE

SLEEP-MODE

CONTROL

FILTER

AOUT1

10k

AOUT2

DOUT1

INPUT

SHORT

DETECTION

ISET

IN1

REF

BAT

MAX9621

SLEEP

FILTER

DOUT2

IN2

REF

GND