Rainbow-electronics MAX9921 Bedienungsanleitung PDF herunterladen

General Description

The MAX9921 provides a single chip solution to interface

two 2-wire Hall-effect sensors to a low-voltage micro-

processor (µP). This device supplies and monitors the cur-

rent drawn by two Hall-effect sensors, filters the sensed

current level, and outputs the corresponding logic level.

The MAX9921 includes input diagnostics and fault pro-

tection. These features allow the device to determine fault

conditions such as open inputs, inputs shorted to the bat-

tery, and inputs shorted to ground. If the MAX9921

detects any of these conditions at either IN1 or IN2, the

device shuts off the current to the corresponding input.

The MAX9921 protects the Hall sensors from supply tran-

sients up to 60V at the BAT supply. Normal operating

supply voltage ranges from 6V to 18V. If the battery volt-

age is out of range, the MAX9921 shuts off the current to

the Hall sensors.

The MAX9921 provides an 80µs blanking time following

Hall sensor power-up or restart. The open-drain logic

outputs are compatible with logic levels up to 5.5V.

The MAX9921 is available in a small 10-pin µMAX

package and is specified over the -40°C to +125°C

automotive temperature range.

Applications

Features

♦ Withstands 60V at BAT Supply and Hall Inputs

♦ 6V to 18V Operating Voltage Range

♦ Provides Supply Current and Interfaces to Two

2-Wire Hall Sensors

♦ Error Output with Diagnostics of Hall Inputs and

BAT Voltage

♦ Protects Hall Sensors from Overvoltage by

Isolating them from Supply Transients

♦ Hall Inputs Protected from Short to Ground

♦ Ramps Current to Hall Sensors at 4mA/µs

♦ Output Enable Input Allows Multiplexing of

Outputs from Multiple MAX9921s

♦ Hall Output Filtering

♦ Hall Sensor Blanking Following Hall Sensor

Power-Up and Restart

♦ Low-Power Shutdown, Controlled with OE and

DIAG Inputs

♦ Operates with ±2V Ground Shifts Between Hall

Sensor and MAX9921

MAX9921

Dual, 2-Wire Hall-Effect Sensor Interface

with Diagnostics

________________________________________________________________

Maxim Integrated Products

PART TEMP RANGE PIN-PACKAGE

MAX9921AUB+T -40°C to +125°C 10 µMAX

Ordering Information

REMOTE

GROUND

ISET

BATTERY

ERR

DIAG

OUT1

OUT2

BAT

ISET

= 63.4kΩ, 1%

BAT

: 6V TO 18V OPERATING,

WITHSTANDS 60V

3.3V TO 5V

IN1

0.1μF

10kΩ

IN2

REF

GENERATION,

DIAGNOSTICS

AND

OVERVOLTAGE

DETECT

REMOTE

GROUND

0.01μF

CONTROL

FILTER

μP/LOGIC

CIRCUIT

GND

0.01μF

GND

MAX9921

Typical Application Circuit

19-4119; Rev 0; 6/08

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.

Denotes a lead-free package.

T = Tape and reel.

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

Pin Configuration appears at end of data sheet.

Door Modules

Window Lifters

Seat Movers

Electric Sunroofs

Powered Lift Gate

Controllers

Powered Running Boards

Seatbelt Buckles

1 2 3 4 5 6 ... 14 15

Inhaltsverzeichnis

Seite 1 - Typical Application Circuit

General DescriptionThe MAX9921 provides a single chip solution to interfacetwo 2-wire Hall-effect sensors to a low-voltage micro-processor (µP). This

Seite 2 - DC ELECTRICAL CHARACTERISTICS

Detailed DescriptionThe MAX9921 connects two 2-wire Hall-effect sensors toa low-voltage µP. This device supplies current throughIN1 and IN2 to Hall se

Seite 3 - AC TIMING CHARACTERISTICS

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics_____________________________________________________________________________________

Seite 4 - Timing Diagrams

MAX9921Hall Input Short-to-GroundThe Hall input shorted-to-ground fault is effectively alatched condition if the input remains loaded by the Hallswitc

Seite 5 - Timing Diagrams (continued)

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics_____________________________________________________________________________________

Seite 6 - = 14V, T

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics14 __________________________________________________________________________________

Seite 7

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with DiagnosticsMaxim cannot assume responsibility for use of any circuitry other than circuitry enti

Seite 8

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics2 ___________________________________________________________________________________

Seite 9 - Pin Description

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics_____________________________________________________________________________________

Seite 10 - Functional Diagram

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics4 ___________________________________________________________________________________

Seite 11 - Hall Input Shorted to Battery

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics_____________________________________________________________________________________

Seite 12 - Hall Sensor Connection

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics6 ___________________________________________________________________________________

Seite 13

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics_____________________________________________________________________________________

Seite 14 - Applications Information

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics8 ___________________________________________________________________________________

Seite 15 - Package Information

MAX9921Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics_____________________________________________________________________________________

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Inhaltsverzeichnis

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