PCA9672BS118

The PCA9672BS,118 provides general-purpose remote I/O expansion via the two-wirebidirectional I²C‑bus (serial clock (SCL), serial data (SDA)).

The devices consist of eight quasi-bidirectional ports, 1 MHz 30 mA drive I²C‑businterface, three hardware address inputs and a reset input operating between 2.3 V and5.5 V. 1 MHz I²C‑bus Fast-mode Plus (Fm+) can support PWM dimming of LEDs, andhigher I²C‑bus drive 30 mA allows more devices to be on the bus without the need for busbuffers. The quasi-bidirectional port can be independently assigned as an input to monitorinterrupt 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 singleregister.

The low current consumption of 2.5 μA (typical, static) is great for mobile applications andthe latched output ports have 25 mA high current sink drive capability for directly drivingLEDs.

The PCA9672BS,118 has two hardware address pins, allowing sixteen of each device to be onthe same I²C‑bus without the need for bus buffers, so there can be supporting up to128 I/Os (for example, 128 LEDs).

The active LOW open-drain interrupt output (INT) can be connected to the interrupt logicof the microcontroller and is activated when any input state differs from its correspondinginput port register state. It is used to indicate to the microcontroller that an input state haschanged and the device needs to be interrogated without the microcontroller continuouslypolling the input register via the I²C‑bus.

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 μA current source.

Feature