PCF8574PW
Product Overview
- Category: Integrated Circuit
- Use: I/O Expander
- Characteristics: Low power, 8-bit remote I/O expander for I2C-bus with interrupt
- Package: TSSOP (Thin Shrink Small Outline Package)
- Essence: Expand the I/O capabilities of microcontrollers through the I2C bus
- Packaging/Quantity: Available in reels of 2500 units
Specifications
- Supply Voltage: 2.5V to 6V
- I/O Voltage: 0V to VCC
- Operating Temperature Range: -40°C to +85°C
- I2C-bus Interface: Standard-mode, Fast-mode, and Fast-mode Plus
Detailed Pin Configuration
The PCF8574PW has a total of 16 pins, including power supply, ground, I2C-bus interface, and I/O ports.
Functional Features
- 8-bit remote I/O expander for the I2C-bus
- Interrupt output
- Low standby current consumption
Advantages
- Simplifies I/O expansion for microcontrollers
- Low power consumption
- Interrupt feature for efficient communication
Disadvantages
- Limited to 8-bit I/O expansion
- Requires understanding of I2C-bus protocol for effective use
Working Principles
The PCF8574PW acts as an I/O expander by providing additional digital input/output pins to a microcontroller through the I2C-bus. It communicates with the microcontroller using the I2C protocol and allows for easy expansion of I/O capabilities.
Detailed Application Field Plans
- Industrial automation
- Consumer electronics
- IoT devices
- Robotics
- Automotive applications
Detailed and Complete Alternative Models
- MCP23008
- MCP23S08
- MAX7311
In conclusion, the PCF8574PW is a versatile I/O expander that offers low power consumption and simplified I/O expansion for microcontrollers. Its integration into various applications such as industrial automation, consumer electronics, and IoT devices makes it a valuable component in modern electronic systems.
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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av PCF8574PW i tekniska lösningar
What is PCF8574PW?
- The PCF8574PW is an I/O expander that provides additional input/output ports for microcontrollers through the I2C interface.
How many I/O ports does PCF8574PW provide?
- The PCF8574PW provides 8 I/O ports, which can be used as either inputs or outputs.
What is the supply voltage range for PCF8574PW?
- The supply voltage range for PCF8574PW is typically between 2.5V and 6V.
Can PCF8574PW be used with 5V microcontrollers?
- Yes, PCF8574PW can be used with 5V microcontrollers as it is compatible with both 3.3V and 5V systems.
How do I address multiple PCF8574PW devices on the same I2C bus?
- Each PCF8574PW has a configurable address using its A0, A1, and A2 pins, allowing up to 8 devices to be addressed on the same I2C bus.
What are some common applications of PCF8574PW?
- PCF8574PW is commonly used for expanding the I/O capabilities of microcontrollers in applications such as keypad interfacing, LED control, and driving relays.
What is the maximum sink current per I/O port for PCF8574PW?
- The maximum sink current per I/O port for PCF8574PW is typically 20mA.
Can PCF8574PW be used for driving high-power loads directly?
- No, PCF8574PW is not designed to drive high-power loads directly and should be used with external drivers or buffers for such applications.
Does PCF8574PW have internal pull-up resistors?
- Yes, PCF8574PW has internal pull-up resistors that can be enabled for the I/O ports.
Is there a library available for interfacing PCF8574PW with popular microcontrollers?
- Yes, there are libraries available for interfacing PCF8574PW with popular microcontrollers such as Arduino and Raspberry Pi, making it easier to integrate into projects.