pca9673 NXP Semiconductors, pca9673 Datasheet - Page 17

• Manufacturer Part Number: pca9673
• Description: Remote 16-bit I/o Expander For Fm+ I2c-bus With Interrupt And Reset
• Manufacturer: NXP Semiconductors

NXP Semiconductors
10. Application design-in information
PCA9673_1
Product data sheet
10.1 Bidirectional I/O expander applications
10.2 High current-drive load applications
In the 8-bit I/O expander application shown in
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 I
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
Fig 25. High current-drive load application
PROCESSOR
Remote 16-bit I/O expander for Fm+ I
CORE
PROCESSOR
Rev. 01 — 1 February 2007
CORE
2
C-bus.
V
DD
V
DD
SDA
SCL
INT
RESET
AD0
AD1
V
SDA
SCL
INT
RESET
AD0
AD1
DD
Figure
P00
P01
P02
P03
P04
P05
P06
P07
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DD
P00
P01
P02
P03
P04
P05
P06
P07
24, P00 and P01 are inputs, and P02
temperature sensor
battery status
control for latch
control for switch
control for audio
control for camera
control for MP3
2
C-bus with interrupt and reset
002aac311
LOAD
V
DD
002aac310
PCA9673
© NXP B.V. 2007. All rights reserved.
V
DD
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