PCA9670 Remote 8-bit I/O Expander For Fm I²C-bus With Reset

The PCA9670 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 PCA9670 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 25 mA LEDs on at the same time and more device addresses (64 versus 8) are available to allow many more devices on the bus without address conflicts. The difference between the PCA9670 and the PCF8574 is that the interrupt output on the PCF8574 is replaced by a RESET input on the PCA9670. The devices consist of an 8-bit quasi-bidirectional port and an I2C-bus Interface The PCA9670 have low current consumption and include latched outputs with 25 mA high current drive capability for directly driving LEDs The internal Power-On Reset (POR), hardware reset pin (RESET), or software reset sequence initializes the I/Os as inputs.
By NXP Semiconductors