PCA9675DB datasheet(19/34 Pages) PHILIPS

19 / 34 page

PCA9675_1

Product data sheet

Rev. 01 — 1 February 2007

19 of 34

NXP Semiconductors

PCA9675

Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt

10. Application design-in information

10.1 Bidirectional I/O expander applications

In the 8-bit I/O expander application shown in Figure 24, P00 and P01 are inputs, and P02

to P07 are outputs. When used in this conﬁguration, during a write, the input (P00 and

P01) must be written as HIGH so the external devices fully control the input ports. The

desired HIGH or LOW logic levels may be written to the I/Os used as outputs (P02 to

P07). During a read, the logic levels of the external devices driving the input ports (P00

and P01) and the previous written logic level to the output ports (P02 to P07) will be read.

The GPIO also has an interrupt line (INT) that can be connected to the interrupt logic of

the microprocessor. By sending an interrupt signal on this line, the remote I/O informs the

microprocessor that there is incoming data or a change of data on its ports without having

to communicate via the I2C-bus.

10.2 High current-drive load applications

The GPIO has a maximum sinking current of 25 mA per bit. In applications requiring

additional drive, two port pins in the same octal may be connected together to sink up to

50 mA current. Both bits must then always be turned on or off together. Up to 8 pins (one

octal) can be connected together to drive 200 mA.

Fig 24. Bidirectional I/O expander application

002aab812

VDD

temperature sensor

battery status

control for latch

control for switch

control for audio

control for camera

control for MP3

P00

P01

P02

P03

P04

P05

P06

P07

VDD

SDA

SCL

INT

AD0

AD1

AD2

CORE

PROCESSOR

VDD

Fig 25. High current-drive load application

002aab813

VDD

P00

P01

P02

P03

P04

P05

P06

P07

VDD

SDA

SCL

INT

AD0

AD1

AD2

CORE

PROCESSOR

VDD

LOAD

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