PCA9670

PCA9670 Remote 8-bit I/O expander for Fm+ I2C-bus with reset Rev. 3 — 30 May 2013 Product data sheet 1. General description The PCA9670 provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus (serial clock (SCL), serial data (SDA)). The devices consist of eight quasi-bidirectional ports, 1 MHz 30 mA drive I2C-bus interface, three hardware address inputs and a reset input operating between 2.3 V and 5.5 V. 1 MHz I2C-bus Fast-mode Plus (Fm+) can support PWM dimming of LEDs, and higher I2C-bus drive 30 mA allows more devices to be on the bus without the need for bus buffers. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs. The system master can read from the input port or write to the output port through a single register. The low current consumption of 2.5 A (typical, static) is great for mobile applications and the latched output ports have 25 mA high current sink drive capability for directly driving LEDs. The PCA9670 has three hardware address pins and allows up to 64 of these PCA9670 I/O expanders on the same I2C-bus without the need for bus buffers, supporting up to 512 I/Os (for example, 512 LEDs). The internal Power-On Reset (POR) and active LOW hardware reset pin (RESET) initialize the I/Os as inputs with a weak internal pull-up 100 A current source. 2. Features and benefits  I2C-bus to parallel port expander  1 M...