Description
PCA8574PW,118 NXP Semiconductors Interface Remote 8-bit I/O expander for I2C-bus with interrupt 400kHz 16-TSSOP RoHS
The PCA8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional IC-bus (serial clock (SCL), serial data (SDA)). The devices consist of eight quasi-bidirectional ports, 400 kHz IC-bus interface, three hardware address inputs and interrupt output operating between 2.3 V and 5.5 V. 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 4.5 uA (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 PCA8574 and PCA8574A are identical, except for the different fixed portion of the slave address. The three hardware address pins allow eight of each device to be on the same IC-bus, so there can be up to 16 of these I/O expanders PCA8574/74A together on the same IC-bus, supporting up to 128 I/Os (for example, 128 LEDs). The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state. It is used to indicate to the microcontroller that an input state has changed and the device needs to be interrogated without the microcontroller continuously polling the input register via the IC-bus. The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal pull-up 100 A current source.
Specifications
Category: Interface ICs/Interface – I/O Expanders
Package: TSSOP-16
Manufacturer: NXP Semicon
Brand Category: International Brands
Packaging: Tape & Reel (TR) ?
Number of I/O: 8
Interface: I2C
Interrupt Output: Yes
Features: POR
Output Type: Push-pull
Current – Output Source/Sink: 100uA, 25mA
Voltage – Supply: 2.3V ~ 5.5V
Clock Frequency: 400kHz
Operating Temperature: -40C to 85C
Mounting Type: Surface MountType
Manufacturer:Electronic Components
Datasheet:PCA8574PW118.pdf
