Overview
The PCF8575CDWE4 is a 16-bit I2C/SMBus I/O expander produced by Texas Instruments. This device is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface. It operates within a voltage range of 2.5 to 5.5 volts, making it versatile for various applications. The PCF8575CDWE4 is particularly useful in scenarios where additional I/O ports are needed without the need for additional microcontroller pins.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC Supply Voltage Range | 2.5 | 5.5 | V |
| Input Voltage Range | -0.5 | VCC + 0.5 | V |
| Output Voltage Range | -0.5 | VCC + 0.5 | V |
| Continuous Output Low Current | 50 | mA | |
| Continuous Output High Current | -4 | mA | |
| Storage Temperature Range | -65 | 150 | °C |
| I2C Bus Speed | 400 | kHz | |
| Interrupt Valid Time | 4 | μs | |
| Input Data Setup Time | 0 | μs | |
| Input Data Hold Time | 4 | μs |
Key Features
- 16-bit Quasi-Bidirectional I/O Port: The device includes a 16-bit quasi-bidirectional port, allowing each I/O to be used as either an input or an output without the need for a data-direction control signal.
- Low Current Consumption: The PCF8575CDWE4 has low standby current consumption, making it suitable for power-sensitive applications.
- Latched Outputs with High-Current Drive Capability: The device features latched outputs with high-current drive capability, enabling it to directly drive LEDs.
- Interrupt Line: An interrupt line (INT) allows the remote I/O to inform the microcontroller of incoming data on its ports without continuous communication via the I2C-bus.
- Addressing Capability: The device can be addressed using three hardware address pins, allowing up to eight devices to be connected on the same I2C-bus.
- ESD Protection: The device exceeds JESD 22 standards for ESD protection, ensuring robustness against electrostatic discharge.
Applications
- Microcontroller Expansion: The PCF8575CDWE4 is ideal for expanding the I/O capabilities of microcontrollers in various applications.
- Industrial Automation: It can be used in industrial automation systems where additional I/O ports are required for controlling and monitoring devices.
- Consumer Electronics: Suitable for use in consumer electronics such as home appliances, gaming consoles, and other devices that require additional I/O ports.
- Automotive Systems: Can be integrated into automotive systems for controlling various functions and monitoring sensors.
- Medical Devices: Used in medical devices where reliable and low-power I/O expansion is necessary.
Q & A
- What is the voltage range of the PCF8575CDWE4?
The PCF8575CDWE4 operates within a voltage range of 2.5 to 5.5 volts.
- How many I/O ports does the PCF8575CDWE4 have?
The device features a 16-bit quasi-bidirectional I/O port.
- What is the maximum I2C bus speed of the PCF8575CDWE4?
The maximum I2C bus speed is 400 kHz.
- Does the PCF8575CDWE4 have an interrupt feature?
Yes, it includes an interrupt line (INT) to inform the microcontroller of incoming data.
- How many devices can be addressed on the same I2C-bus?
Up to eight devices can be addressed using three hardware address pins.
- What is the standby current consumption of the PCF8575CDWE4?
The device has a low standby current consumption of up to 10 μA.
- Can the PCF8575CDWE4 directly drive LEDs?
Yes, it features latched outputs with high-current drive capability for directly driving LEDs.
- What is the storage temperature range of the PCF8575CDWE4?
The storage temperature range is from -65°C to 150°C.
- Does the PCF8575CDWE4 have ESD protection?
Yes, it exceeds JESD 22 standards for ESD protection.
- What are some common applications of the PCF8575CDWE4?
Common applications include microcontroller expansion, industrial automation, consumer electronics, automotive systems, and medical devices.
