MAX9921EVKIT [MAXIM]

Proven PCB Layout;


型号：	MAX9921EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Proven PCB Layout PC
文件：	总6页 (文件大小：167K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4165; Rev 0; 6/08

MAX9921 Evaluation Kit

Evluates:MAX921

General Description

Features

♦ 6V to 18V Operating Voltage Range, Survives 60V

♦ Two 2-Wire Hall-Effect Sensors on the Board

♦ Three Output Status LED Indicators

♦ Proven PCB Layout

The MAX9921 evaluation kit (EV kit) is a fully assembled

and tested PCB that demonstrates the capabilities of

the MAX9921 dual 2-wire Hall-effect sensor interface

with diagnostics capability. The EV kit comes with the

MAX9921AUB+ installed.

♦ Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX9921EVKIT+

EV Kit

+Denotes lead-free and RoHS compliant.

Component List

DESIGNATION

JU1, JU2

JU3–JU7

QTY

DESCRIPTION

DESIGNATION

C1, C3

QTY

DESCRIPTION

0.01µF 10%, 100V X7R ceramic

capacitors (0603)

TDK C1608X7R2A103K

5-pin, 4-way headers

2-pin headers

63.4kΩ 1% resistor (0603)

100kΩ 5% resistors (0603)

240Ω 5% resistors (0603)

C2, C4

Not installed, capacitors

R2–R5

0.1µF 10%, 100V X7R ceramic

capacitors (0805)

R6, R7, R8

C5, C6, C7

Hall-effect switches

Allegro A1140EUA

TDK C2012X7R2A104K

S1, S2

S3, S4

1µF 10%, 25V X5R ceramic

capacitor (0805)

Not installed, switches

TDK C2012X5R1E105K

Automotive Hall-effect interface

(10 µMAX )

Maxim MAX9921AUB+

2.2µF 10%, 100V X5R ceramic

capacitor (1812)

TDK C4532X7R2A225K

Automotive micropower linear

regulator (6 TDFN)

Maxim MAX6765TTLD2+

100V, 200mA diode (SOD123)

Central CMHD4448

—

Triple-buffer gate (8 TSSOP)

Shunts

D2, D3

Green LEDs (0603)

Red LED (0603)

Not installed

PCB: MAX9921 Evaluation Kit+

Component Suppliers

SUPPLIER

PHONE

WEBSITE

Central Semiconductor Corp.

TDK Corp.

631-435-1110

847-803-6100

www.centralsemi.com

www.component.tdk.com

Note: Indicate that you are using the MAX9921 when contacting these component suppliers.

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

________________________________________________________________ Maxim Integrated Products

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.

MAX9921 Evaluation Kit

Quick Start

Recommended Equipment

Before beginning, the following equipment is needed:

Table 1. MAX9921 EV KIT Jumper

Descriptions (JU1-JU7)

JUMPER POSITION

DESCRIPTION

•

MAX9921 EV kit

Emulates Hall input shorted to

battery

1-2

One 6V to 18V DC power supply

A magnet

Demonstrates normal operation

with on-board Hall sensor

1-3*

JU1, JU2

Procedure

1-4

1-5

Emulates Hall input shorted to GND

Evaluates other Hall sensors

Emulates the open-circuit failure

Outputs enabled

The MAX9921 EV kit is fully assembled and tested.

Follow the steps below to verify board operation.

Caution: Do not turn on the power supply until all

connections are made.

Open

1-2*

JU3

1) Verify that all jumpers are in the default positions, as

shown in Table 1.

Open

Outputs disabled

Outputs reflect diagnostic

information

2) Connect the DC power supply between the

MAX9921 EV kit’s VBAT and GND pads.

1-2

JU4

Outputs reflect Hall sensor

information

3) Turn on the DC power supply.

Open*

4) Move the magnet in front of S1 and S2. Observe the

light change of the OUT1 and OUT2 LEDs on the

EV kit board.

Evluates:MAX921

1-2*

JU5

OUT1 with 100kΩ pullup

OUT1 without pullup

OUT2 with 100kΩ pullup

OUT2 without pullup

ERR with 100kΩ pullup

ERR without pullup

Open

1-2*

JU6

Detailed Description of Hardware

Open

The MAX9921 EV kit board provides a proven layout for

evaluating the MAX9921. The EV kit comes with

MAX9921AUB+ installed.

1-2*

JU7

Open

*Default position.

External Power Supply

The MAX9921 is powered by a user-supplied 6V to

18V DC power supply connecting between VBAT and

GND. The MAX9921 EV kit board is not reverse-

battery protected.

DIAG and OE Configuration

The MAX9921 EV kit uses JU3 and JU4 to configure the

MAX9921 DIAG and OE inputs, as shown in Table 1.

Refer to the MAX9921 IC data sheet for a detailed

description of the MAX9921 diagnostic information.

During the emulation of the Hall input shorted to GND,

the MAX9921 will draw substantial shorting current until

the MAX9921 turns off the shorted input. The shorting

current can reach a peak of 60mA to 70mA and the

entire event may last 0.5µs. Many common regulated-

lab power supplies will overshoot in response to a

large, short-term current pulse. When evaluating the

short-to-GND fault, an unregulated supply is recom-

mended, such as a wet-cell battery.

Outputs, Related LEDs, and Jumpers

The MAX9921 EV kit has three outputs: OUT1, OUT2,

and ERR. Each output has an LED to indicate its cur-

rent status. All three outputs can be individually pulled

up with a 100kΩ resistor, as shown in Table 1. Refer to

the MAX9921 IC data sheet for a detailed description of

OUT1, OUT2, and ERR outputs.

Hall-Effect Sensors and Related Jumpers

The MAX9921 EV kit has two Hall-effect sensors

(A1140EUA). JU1 and JU2 provide a convenient way to

evaluate the MAX9921 with different Hall-effect sensors

and emulate different failure conditions, as shown in

Table 1.

_______________________________________________________________________________________

MAX9921 Evaluation Kit

Evluates:MAX921

Figure 1. MAX9921 EV Kit Schematic

_______________________________________________________________________________________

MAX9921 Evaluation Kit

Evluates:MAX921

Figure 2. MAX9921 EV Kit Component Placement Guide—Component Side

_______________________________________________________________________________________

MAX9921 Evaluation Kit

Evluates:MAX921

Figure 3. MAX9921 EV Kit PCB Layout—Component Side

_______________________________________________________________________________________

MAX9921 Evaluation Kit

Evluates:MAX921

Figure 4. MAX9921 EV Kit PCB Layout—Solder Side

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

6 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Maxim Integrated Products, Inc.

MAX9921EVKIT [MAXIM]

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