PCA9672 Datasheet, PDF (1/27 Pages) NXP Semiconductors – Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt and reset

PCA9672
Remote 8-bit I/O expander for Fm+ I²C-bus with interrupt and
reset
Rev. 02 — 6 July 2007
Product data sheet
1. General description
The PCA9672 provides general purpose remote I/O expansion for most microcontroller
families via the two-line bidirectional bus (I²C-bus) and is a part of the Fast-mode Plus
family.
The PCA9672 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus
(Fm+) I²C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWM
dimming of LEDs, higher I²C-bus drive (30 mA versus 3 mA) so that many more devices
can be on the bus without the need for bus buffers, higher total package sink capacity
(200 mA versus 100 mA) that supports having all LEDs on at the same time and more
device addresses (16 versus 8) are available to allow many more devices on the bus
without address conflicts.
The difference between the PCA9672 and the PCF8574 is that the A2 address pin is
replaced by the RESET input on the PCA9672.
The device consists of an 8-bit quasi-bidirectional port and an I²C-bus interface. The
PCA9672 has low current consumption and include latched outputs with 25 mA high
current drive capability for directly driving LEDs.
The PCA9672 possesses an interrupt line (INT) that can be connected to the interrupt
logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can
inform the microcontroller if there is incoming data on its ports without having to
communicate via the I²C-bus.
The internal Power-On Reset (POR), hardware reset pin (RESET), or Software Reset
sequence initializes the I/Os as inputs.
2. Features
I 1 MHz I²C-bus interface
I Compliant with the I²C-bus Fast and Standard modes
I SDA with 30 mA sink capability for 4000 pF buses
I 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
I 8-bit remote I/O pins that default to inputs at power-up
I Latched outputs with 25 mA sink capability for directly driving LEDs
I Total package sink capability of 200 mA
I Active LOW open-drain interrupt output
I 16 programmable slave addresses using 2 address pins
I Readable device ID (manufacturer, device type, and revision)