PCF8584 datasheet(5/40 Pages) PHILIPS

5 / 40 page

1997 Oct 21

Philips Semiconductors

Product speciﬁcation

I2C-bus controller

PCF8584

PINNING

SYMBOL

I/O

DESCRIPTION

CLK

clock input from microcontroller clock generator (internal pull-up)

SDA or

SDA OUT

I/O

I2C-bus serial data input/output (open-drain). Serial data output in long-distance

mode.

SCL or SCL IN

I/O

I2C-serial clock input/output (open-drain). Serial clock input in long-distance mode.

IACK or

SDA IN

Interrupt acknowledge input (internal pull-up); when this signal is asserted the

interrupt vector in register S3 will be available at the bus Port if the ENI ﬂag is set.

Serial data input in long-distance mode.

INT or

SCL OUT

Interrupt output (open-drain); this signal is enabled by the ENI ﬂag in register S1.

It is asserted when the PIN ﬂag is reset. (PIN is reset after 1 byte is transmitted or

received over the I2C-bus). Serial clock output in long-distance mode.

the other registers depending on bits loaded in ESO, ES1 and ES2 of register S1.

DB0

I/O

bidirectional 8-bit bus Port 0

DB1

I/O

bidirectional 8-bit bus Port 1

DB2

I/O

bidirectional 8-bit bus Port 2

VSS

−

ground

DB3

I/O

bidirectional 8-bit bus Port 3

DB4

I/O

bidirectional 8-bit bus Port 4

DB5

I/O

bidirectional 8-bit bus Port 5

DB6

I/O

bidirectional 8-bit bus Port 6

DB7

I/O

bidirectional 8-bit bus Port 7

RD (DTACK)

I/(O)

RD is the read control input for MAB8049, MAB8051 or Z80-types. DTACK is the

data transfer control output for 68000-types (open-drain).

chip select input (internal pull-up)

WR (R/W)

WR is the write control input for MAB8048, MAB8051, or Z80-types

(internal pull-up). R/W control input for 68000-types.

RESET/

STROBE

I/O

Reset input (open-drain); this input forces the I2C-bus controller into a predeﬁned

state; all ﬂags are reset, except PIN, which is set. Also functions as strobe output.

VDD

−

supply voltage

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