PCF8574RGYR - Brand New Texas Instruments I/O Expanders
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Description
The PCF8574RGYR is a silicon CMOS circuit that provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus). It consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. The PCF8574RGYR has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. It also has an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C-bus. This means that the PCF8574RGYR can remain a simple slave device. The PCF8574RGYR and PCF8574A versions differ only in their slave address as shown in Fig.10.
Specifications and Features
- Operating supply voltage: 2.5 to 6 V
- Low standby current consumption: 10 µA maximum
- I2C-bus to parallel port expander
- Open-drain interrupt output
- 8-bit remote I/O port for the I2C-bus
- Compatible with most microcontrollers
- Latched outputs with high current drive capability for directly driving LEDs
- Address by 3 hardware address pins for use of up to 8 devices (up to 16 with PCF8574A)
- Packages available in DIP16, SO16, or SSOP20
Application Scenarios
The PCF8574RGYR can be used in various applications such as:
- I/O expansion for microcontroller projects
- Controlling LEDs
- Interrupt-based communication between remote I/O and microcontrollers
Comparison
Advantages- Low standby current consumption
- High current drive capability for directly driving LEDs
- Compatible with most microcontrollers
- Addressing up to 8 devices (up to 16 with PCF8574A)
Disadvantages- Requires an I2C-bus interface
- Limited to 8-bit remote I/O port
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Datasheet
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- Datasheet: Download PCF8574RGYR
- Chipdatas Part: CD94-PCF8574RGYR
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- Last Updated: 2024/06/13 20:19 +0800
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