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PCF8584

I2C-bus controller

NXP Semiconductors. 

Philips Semiconductors

I2C-bus controller

Product specification

PCF8584

8 I2C-BUS TIMING DIAGRAMS

The diagrams (Figs 10 to 13) illustrate typical timing diagrams for the PCF8584 in master/slave functions. For detailed

description of the I2C-bus protocol, please refer to “The I2C-bus and how to use it”; Philips document

ordering number 9398 393 40011.

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SCL

INT

7-bit address (76H)

interrupt

START

condition

R/W = 0

ACK

from slave receiver

first-byte (E4H)

interrupt

ACK

nbyte

ACK

interrupt

STOP

condition

MBE709

Master PCF8584 writes data to slave transmitter.

Fig.10 Bus timing diagram; master transmitter mode.

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SCL

INT

7-bit address (76H)

interrupt

first-byte (discard)

START

condition

R/W = 1

ACK

'DUMMY READ'

must be executed here

from slave

interrupt

ACK

nbyte

from master

receiver

no ACK

Master PCF8584 reads data from slave transmitter.

Fig.11 Bus timing diagram; master receiver mode.

1997 Oct 21

20

STOP

condition

MBE710

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