Philips Semiconductors

Product specification

PTN3500

Maintenance and control device

2001 Jan 17

6

Quasi-bidirectional I/Os (see Figure 11)

A quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. At power-on the I/Os are HIGH.

These devices turn on when an output is written HIGH, and are switched off by the negative edge of SCL. The I/Os should be HIGH before

being used as inputs.

S

0

1

0

0

A2

A1

A0

0

A

A

A

SDA

SCL

12

34

5

6

7

8

SW00757

ACKNOWLEDGE

FROM SLAVE

R/W

START CONDITION

ACKNOWLEDGE

FROM SLAVE

SLAVE ADDRESS (PTN3500)

DATA TO PORT

DATA TO PORT

1

P3

0

P3

P

P3

OUTPUT

VOLTAGE

P3

PULL-UP

OUTPUT

CURRENT

SYMBOL

PARAMETER

MIN

TYP

MAX

UNIT

4

µs

0

µs

4

µs