Microchip MIC74 Bedienungsanleitung

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August 20001MIC74

MIC74 Evaluation Board

SMBus™ I/O Expander and Fan Controller Evaluation Board

General Description

This evaluation board demonstrates use of the MIC74 Serial

I/O expander and fan controller. It is designed to support rapid

prototyping of circuits employing the MIC74 as an I/O ex-

pander and/or a fan speed controller. Support is included for

dual power supplies in order to demonstrate the 5V-tolerant

I/O capabilities of the MIC74. An MIC5205 150mA LDO

regulator can be congured to supply 3.3V to the MIC74 while

the other circuitry is supplied from a single external 5V supply.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

SMBus™ is a trademark of Intel Corporation.

I2C™ is a trademark of Philips Electronics, N.V.

IPort™ and Message Manager™ are trademarks of Microcomputer Control Corporation.

User congurable jumpers allow each of the MIC74’s I/O lines

to be used as an input or output, or the high-order lines can

be congured for fan speed control. An MIC29152, a high-

current low-dropout regulator, is included to drive common

12V brushless DC fans.

A 4-pin connector is provided to interface the evaluation

board with a serial bus host such as the IPort™, an I2C™ Host

Adapter from MCC Corp. This connector is commonly used

for interoperability testing among SMBus™ or ACCESS.bus

hosts and peripherals. For more information regarding the

IPort™ I2C™ Host Adapter and the I2C™ Message Man-

ager™ Software, see Appendix A.

J5

GND

J1

5V

A0

A1

A2

I0

I1

I2

I3

I4

I5

I6

I7

JP21

J6

GND

JP22

TP1TP2 TP3

/SHDN

/FS0

/FS1

/FS2

J2

VDD

LED0

LED7

U1

J3

12V

J4

VOUT

JP20

MIC74BSM-16

Ground Host connections

Slave address

jumpers

JP17 - JP19

Input jumpers

JP1 - JP8

+

Fan

terminals

-

Fan

supply

terminal

+5V

Input

+2.7 - 3.3V

Input

Output

jumpers

JP9 - JP16

& LEDs

07

Fan mode

jumpers

JP23 - JP26

JP20

JP21

Ground

MIC

29152BU

0000 X

TP1

(DATA)

TP2

(CLOCK)

TP3

(/ALERT)

CON1 JP22

MIC74 Evaluation Board Jumper and Connector Layout

Produktspezifikationen