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PCF8584

I2C-bus controller

NXP Semiconductors. 

Philips Semiconductors

I2C-bus controller

Product specification

PCF8584

4 BLOCK DIAGRAM

handbook, full pagewidth

SDA/

2

SDA OUT (3)

DIGITAL

FILTER

DATA CONTROL

PCF8584

SCL/

SCL IN

(3)

3

DIGITAL

FILTER

SCL CONTROL

PARALLEL BUS

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

15 14 13 12 11 9

8

7

MSB

READ BUFFER

DATA SHIFT REGISTER S0 AND READ BUFFER

SHIFT REGISTER

V DD V SS

20 10

read

only

write

only

8

COMPARATOR S0, S0'

MSB

(1) X

8

OWN ADDRESS S0'

8

(1)

X

LSB

INTERRUPT VECTOR S3

8

CLOCK REGISTER S2

default: 00H 80XX

0FH 68XXX

0

0

0 S24 S23 S22 S21 S20

CLOCK REGISTER S2

8

CONTROL STATUS REGISTER S1

PIN ES0 ES1 ES2 ENI STA STO ACK

CONTROL STATUS REGISTER S1

AD0/

PIN 0 STS BER LRB AAS LAB BB

write only

read only

CLOCK PRESCALER

SCL MULTIPLEXER

BUS BUSY LOGIC

ARBITRATION LOGIC

PARALLEL BUS CONTROL

REGISTER ACCESS CONTROL

BUS BUFFER CONTROL

INTERRUPT CONTROL

RESET/STROBE CONTROL

19

17

6

RESET/ CS

A0

STROBE

(O.C.)

18

16

WR (R/W) (2) RD (DTACK)(2)

5

4

1

INT

IACK

CLK

SCL OUT (3) SDA IN(3)

MBD908 - 1

(1) X = don’t care.

(2) Pin mnemonics between parenthesis indicate the 68000 mode pin designations.

(3) These pin mnemonics represent the long-distance mode pin designations.

Fig.1 Block diagram.

1997 Oct 21

4

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