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PCA9674ATS Datasheet(PDF) 18 Page - NXP Semiconductors

Part # PCA9674ATS
Description  Remote 8-bit I/O expander for Fm I2C-bus with interrupt
PDF  34 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9674ATS Datasheet(HTML) 18 Page - NXP Semiconductors

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PCA9674_PCA9674A_2
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2006
18 of 34
NXP Semiconductors
PCA9674/74A
Remote 8-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 21, P0 and P1 are inputs, and P2 to
P7 are outputs. When used in this configuration, during a write, the input (P0 and P1)
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 (P2 to P7). During a
read, the logic levels of the external devices driving the input ports (P0 and P1) and the
previous written logic level to the output ports (P2 to P7) 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 21. Bidirectional I/O expander application
002aac123
VDD
temperature sensor
battery status
control for latch
control for switch
control for audio
control for camera
control for MP3
P0
P1
P2
P3
P4
P5
P6
P7
VDD
SDA
SCL
INT
AD0
AD1
AD2
CORE
PROCESSOR
VDD
Fig 22. High current-drive load application
002aac124
VDD
P0
P1
P2
P3
P4
P5
P6
P7
VDD
SDA
SCL
INT
AD0
AD1
AD2
CORE
PROCESSOR
VDD
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