Overview
The PCF8574ATS/3,118, produced by NXP USA Inc., is a remote 8-bit I/O expander designed for use with the two-wire bidirectional I²C-bus. This device provides general-purpose remote I/O expansion, making it suitable for a variety of applications requiring additional I/O ports. The PCF8574ATS/3,118 operates over a voltage range of 2.5 V to 6 V and features low current consumption, making it ideal for mobile and battery-powered applications.
Key Specifications
| Parameter | Description |
|---|---|
| Number of I/O Ports | 8 quasi-bidirectional ports |
| I²C-Bus Interface | 100 kHz |
| Hardware Address Inputs | 3 inputs allowing up to 16 devices on the same I²C-bus |
| Interrupt Output | Active LOW open-drain interrupt output (INT) |
| Operating Voltage | 2.5 V to 6 V |
| Current Consumption | Typical static current: 2.5 µA |
| Temperature Range | -40°C to +85°C |
| Package | SSOP20 |
| Packing Method | Reel 13” Q1/T1, SMD 2500 |
Key Features
- Eight quasi-bidirectional I/O ports that can be independently assigned as inputs or outputs.
- 100 kHz I²C-bus interface for communication.
- Three hardware address inputs allowing up to 16 devices on the same I²C-bus, supporting up to 128 I/Os.
- Active LOW open-drain interrupt output (INT) to indicate input state changes.
- Low current consumption (typical static current: 2.5 µA) suitable for mobile and battery-powered applications.
- Latched output ports that directly drive LEDs.
- Internal Power-On Reset (POR) initializes I/Os as inputs with a weak internal pull-up current source.
Applications
- Mobile and battery-powered devices due to low current consumption.
- Industrial control systems requiring additional I/O ports.
- Automotive systems for expanding I/O capabilities.
- Consumer electronics needing flexible I/O expansion.
- Medical devices requiring reliable and low-power I/O expansion.
Q & A
- What is the primary function of the PCF8574ATS/3,118?
The primary function is to provide general-purpose remote I/O expansion via the two-wire bidirectional I²C-bus.
- How many I/O ports does the PCF8574ATS/3,118 have?
The device has 8 quasi-bidirectional I/O ports.
- What is the operating voltage range of the PCF8574ATS/3,118?
The operating voltage range is from 2.5 V to 6 V.
- How many devices of this type can be connected on the same I²C-bus?
Up to 16 devices can be connected on the same I²C-bus, supporting up to 128 I/Os.
- What is the purpose of the interrupt output (INT) on the PCF8574ATS/3,118?
The interrupt output (INT) is used to indicate to the microcontroller that an input state has changed, eliminating the need for continuous polling.
- What is the typical static current consumption of the PCF8574ATS/3,118?
The typical static current consumption is 2.5 µA.
- What is the temperature range for the PCF8574ATS/3,118?
The temperature range is from -40°C to +85°C.
- What package type is the PCF8574ATS/3,118 available in?
The device is available in an SSOP20 package.
- How are the I/O ports initialized after power-on?
The I/O ports are initialized as inputs with a weak internal pull-up current source by the internal Power-On Reset (POR).
- Can the PCF8574ATS/3,118 directly drive LEDs?
