Overview
The PCF8575DGVR, 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. It features a quasi-bidirectional input/output port, allowing each I/O to be used as either an input or output without the need for a data-direction control signal. At power-on, all I/Os are set high, and they can be used as inputs immediately. The device is particularly useful for expanding the I/O capabilities of microcontrollers in various applications.
Key Specifications
| Specification | Value |
|---|---|
| Package | TVSOP (24 pins) |
| Operating Temperature Range | -40°C to 85°C |
| VCC Operating Range | 2.5V to 5.5V |
| I2C Bus Frequency | Up to 400kHz |
| Number of I/O Ports | 16 (P07–P00, P17–P10) |
| Addressing | Three hardware address pins (A0, A1, A2) for up to eight devices |
| Interrupt Output | Open-drain interrupt output |
| Standby Current Consumption | 10µA maximum |
| ESD Protection | 2000V Human-body model, 200V Machine model, 1000V Charged-device model |
Key Features
- I2C to parallel-port expander
- Open-drain interrupt output
- Low standby-current consumption of 10µA maximum
- Compatible with most microcontrollers
- 400kHz Fast I2C bus
- Addressing by three hardware address pins for use of up to eight devices
- Latched outputs with high-current drive capability for directly driving LEDs
- Current source to VCC for actively driving a high at the output
- ESD Protection exceeds JESD 22 standards
Applications
- Telecom Shelters: Filter Units
- Servers and Routers (Telecom Switching Equipment)
- Personal Computers
- Personal Electronics
- Industrial Automation
- Products with GPIO-Limited Processors
Q & A
- What is the PCF8575DGVR used for?
The PCF8575DGVR 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 PCF8575DGVR?
The operating voltage range is 2.5V to 5.5V. - How many I/O ports does the PCF8575DGVR have?
The device has 16 quasi-bidirectional I/O ports (P07–P00, P17–P10). - What is the maximum I2C bus frequency supported by the PCF8575DGVR?
The maximum I2C bus frequency is up to 400kHz. - How many devices can be addressed using the PCF8575DGVR?
Up to eight devices can be addressed using the three hardware address pins (A0, A1, A2). - What type of interrupt output does the PCF8575DGVR have?
The device has an open-drain interrupt output. - What is the standby current consumption of the PCF8575DGVR?
The standby current consumption is 10µA maximum. - Does the PCF8575DGVR have ESD protection?
Yes, it exceeds JESD 22 standards with 2000V Human-body model, 200V Machine model, and 1000V Charged-device model. - Can the PCF8575DGVR drive LEDs directly?
Yes, it has latched outputs with high-current drive capability for directly driving LEDs. - How are the I/O ports configured at power-on?
At power-on, all I/Os are set high and can be used as inputs immediately.
