Overview
The PCF8575CDW, produced by Texas Instruments, is a 16-bit I2C and SMBus I/O expander designed to provide general-purpose remote I/O expansion for most microcontroller families. This device operates within a supply voltage range of 2.5 to 5.5 volts and is compatible with a wide range of microcontrollers through the I2C interface.
The PCF8575CDW features a quasi-bidirectional 16-bit input/output port, allowing each I/O to be used as either an input or an output without the need for a data-direction control signal. The device includes latched outputs with high-current drive capability, making it suitable for directly driving LEDs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.5 to 5.5 | V |
| Input Voltage Range | -0.5 to VCC + 0.5 | V |
| Output Voltage Range | -0.5 to VCC + 0.5 | V |
| Continuous Output Low Current | 50 | mA |
| Continuous Output High Current | -4 | mA |
| Storage Temperature Range | -65 to 150 | °C |
| I2C Bus Frequency | Up to 400 kHz | |
| Standby Current Consumption | 10 μA (maximum) |
Key Features
- I2C to parallel-port expander with a 16-bit quasi-bidirectional input/output port (P07–P00, P17–P10).
- Latched outputs with high-current drive capability for directly driving LEDs.
- Open-drain interrupt output.
- Low standby-current consumption of 10 μA maximum.
- Addressing by three hardware address pins, allowing up to eight devices to be connected on the same bus.
- ESD protection exceeds JESD 22 standards.
- Compatible with most microcontroller families.
Applications
- Telecom shelters and filter units.
- Servers and routers (telecom switching equipment).
- Personal computers and personal electronics.
- Industrial automation products.
- Products with GPIO-limited processors.
Q & A
- What is the PCF8575CDW used for?
The PCF8575CDW is used for providing general-purpose remote I/O expansion for most microcontroller families through the I2C interface.
- What is the supply voltage range of the PCF8575CDW?
The supply voltage range is from 2.5 to 5.5 volts.
- How many devices can be connected on the same I2C bus?
Up to eight devices can be connected on the same bus using three hardware address pins.
- What is the maximum I2C bus frequency supported by the PCF8575CDW?
The device supports I2C bus frequencies up to 400 kHz.
- What is the standby current consumption of the PCF8575CDW?
The standby current consumption is 10 μA maximum.
- Can the PCF8575CDW drive LEDs directly?
Yes, the device has latched outputs with high-current drive capability for directly driving LEDs.
- What type of interrupt output does the PCF8575CDW have?
The device features an open-drain interrupt output.
- What are some common applications of the PCF8575CDW?
Common applications include telecom shelters, servers, routers, personal computers, personal electronics, and industrial automation products.
- Does the PCF8575CDW have ESD protection?
Yes, the device has ESD protection that exceeds JESD 22 standards.
- How do you configure the address of the PCF8575CDW?
The address is configured using three hardware address pins (A0, A1, A2).
