Overview
The PCF8575CDBR, produced by Texas Instruments, is a 16-bit I/O expander designed for use with the two-line bidirectional I2C bus. This device provides general-purpose remote I/O expansion for most microcontroller families, operating within a voltage range of 2.5V to 5.5V VCC. It is particularly useful in applications where additional I/O ports are needed, and it integrates seamlessly with various microcontrollers via the I2C interface.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| VCC Operating Voltage | Supply voltage range | 2.5V to 5.5V |
| Standby Current Consumption | Maximum standby current | 10 μA |
| I2C Bus Speed | Fast I2C bus speed | 400 kHz |
| Addressing | Number of hardware address pins | Three (allowing up to eight devices) |
| I/O Port Configuration | Number and type of I/O ports | 16-bit quasi-bidirectional (P07–P00, P17–P10) |
| Output Drive Capability | High-current drive capability | Latched outputs for directly driving LEDs |
| Latch-Up Performance | Latch-up performance | Exceeds 100 mA per JESD 78, Class II |
| ESD Protection | ESD protection levels | 2000V Human-body model, 200V Machine model, 1000V Charged-device model |
| Operating Temperature Range | Temperature range for operation | -40°C to 85°C |
Key Features
- I2C to Parallel-Port Expander: Converts I2C bus signals to parallel-port signals.
- Open-Drain Interrupt Output: Provides an interrupt signal to the microcontroller.
- Low Standby-Current Consumption: Maximum of 10 μA in standby mode.
- Compatibility with Microcontrollers: Compatible with most microcontroller families.
- Fast I2C Bus: Supports 400 kHz I2C bus speed.
- Addressing Capability: Addressed by three hardware address pins, allowing up to eight devices.
- Latched Outputs with High-Current Drive: Capable of directly driving LEDs.
- Current Source to VCC: Actively drives a high at the output.
- ESD Protection: Exceeds JESD 22 standards for ESD protection.
Applications
- Telecom Shelters and Equipment: Filter units, telecom switching equipment.
- Servers and Routers: Expanding I/O capabilities in server and router systems.
- Personal Computers and Electronics: Enhancing I/O in personal computing and electronic devices.
- Industrial Automation: Used in industrial automation systems where additional I/O is required.
- Products with GPIO-Limited Processors: Ideal for devices with limited GPIO pins on the processor.
Q & A
- What is the PCF8575CDBR used for?
The PCF8575CDBR is used as a 16-bit I/O expander for microcontrollers, providing additional I/O ports via the I2C interface.
- What is the operating voltage range of the PCF8575CDBR?
The operating voltage range is 2.5V to 5.5V VCC.
- What is the maximum standby current consumption of the PCF8575CDBR?
The maximum standby current consumption is 10 μA.
- What is the speed of the I2C bus supported by the PCF8575CDBR?
The device supports a 400 kHz fast I2C bus.
- How many devices can be addressed using the PCF8575CDBR?
Up to eight devices can be addressed using the three hardware address pins.
- What type of outputs does the PCF8575CDBR have?
The device has latched outputs with high-current drive capability, suitable for directly driving LEDs.
- What kind of ESD protection does the PCF8575CDBR offer?
The device exceeds JESD 22 standards for ESD protection, including 2000V Human-body model, 200V Machine model, and 1000V Charged-device model.
- What is the operating temperature range of the PCF8575CDBR?
The operating temperature range is -40°C to 85°C.
- Can the PCF8575CDBR be used as both an input and an output?
Yes, each quasi-bidirectional I/O can be used as either an input or an output without the need for a data-direction control signal.
- How does the interrupt feature work on the PCF8575CDBR?
The device has an open-drain interrupt output that can inform the microcontroller of incoming data on its ports without needing to communicate via the I2C bus.
