MIC74(2000) データシートの表示（PDF） - Micrel

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MIC74
(Rev.:2000)

2-Wire Serial I/O Expander and Fan Controller

Micrel 

MIC74

Pin Configuration

A0 1

A1 2

A2 3

P0 4

P1 5

P2 6

P3 7

GND 8

16 VDD

15 DATA

14 CLK

13 /ALERT

12 P7 (/FS2)

11 P6 (/FS1)

10 P5 (/FS0)

9 P4 (/SHDN0)

16-Lead QSOP

Micrel

Pin Description

Pin Number

1–3

4–7

8

9–12

13

14

15

16

Pin Name

A0–A2

P0–P3

GND

P4–P7 (/SHDN, /FS0–/FS2)

/ALERT

CLK

DATA

VDD

Pin Function

Address (Input): Slave address selection inputs; sets the three least signifi-

cant bits of the MIC74’s slave address.

Parallel I/O (Input/Output): General-purpose I/O pin. Direction and output

type are user programmable.

Ground

Parallel I/O (Input/output): P4–P7 are general-purpose I/O pins. Direction

and output type are user programmable.

Shutdown (Output): When the FAN bit is set, pin 9 becomes SHDN.

Fan Speed (Output): When the FAN bit is set, pins 10 through 12 become /

FS0–/FS2 respectively, controlled by the FAN_SPEED register.

Interrupt (Output): Active-low, open-drain output signals input-change-

interrupts to the host on this pin. Signal is cleared when the bus master

(host) polls the ARA (alert response address = 0001 100) or reads status.

Serial Bus Clock (Input): The host provides the serial bit clock in this input.

Serial Data (Input/Output): Serial data input and open-drain serial data

output.

Power Supply (Input.)

MIC74

2

August 1, 2000

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