PCA9672 Remote 8-bit I/O Expander For Fm I²C-bus With Interrupt And Reset

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.
By NXP Semiconductors