Overview
The PCF8575PWRE4, produced by Texas Instruments, is a 16-bit I2C and SMBus I/O expander designed for remote I/O expansion in various applications. This device operates within a voltage range of 2.5V to 5.5V and is compatible with most microcontroller families through the I2C interface. It features a quasi-bidirectional 16-bit input/output port, allowing each I/O pin to be used as either an input or an output without the need for a data-direction control signal. The PCF8575PWRE4 is available in several package types, including SSOP, QSOP, TVSOP, SOIC, TSSOP, and VQFN, making it versatile for different design requirements.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Voltage (VCC) | 2.5V to 5.5V |
| Number of I/O Bits | 16 bits (P07–P00, P17–P10) |
| Interface | I2C and SMBus |
| Interrupt Output | Open-drain interrupt output |
| Standby Current | Maximum 10μA |
| Package Types | SSOP, QSOP, TVSOP, SOIC, TSSOP, VQFN |
| Address Inputs | A0, A1, A2 (connect directly to VCC or ground) |
Key Features
- I2C to parallel-port expander
- Open-drain interrupt output
- Low standby-current consumption of maximum 10μA
- Quasi-bidirectional 16-bit input/output port (P07–P00, P17–P10)
- Latched outputs with high-current drive capability for directly driving LEDs
- No need for data-direction control signal for I/O pins
Applications
- Telecom Shelters: Filter Units
- Servers and Routers (Telecom Switching Equipment)
- Personal Computers and Personal Electronics
- Industrial Automation
- Products with GPIO-Limited Processors
Q & A
- What is the operating voltage range of the PCF8575PWRE4?
The operating voltage range is 2.5V to 5.5V.
- How many I/O bits does the PCF8575PWRE4 have?
The device has 16 I/O bits, divided into two 8-bit ports (P07–P00 and P17–P10).
- What type of interface does the PCF8575PWRE4 use?
The device uses the I2C and SMBus interfaces.
- What is the maximum standby current consumption of the PCF8575PWRE4?
The maximum standby current consumption is 10μA.
- What types of packages are available for the PCF8575PWRE4?
The device is available in SSOP, QSOP, TVSOP, SOIC, TSSOP, and VQFN packages.
- How are the address inputs (A0, A1, A2) connected?
The address inputs are connected directly to VCC or ground without the need for pull-up resistors.
- What is the purpose of the interrupt output on the PCF8575PWRE4?
The interrupt output is an open-drain output that requires a pull-up resistor to VCC.
- Can the I/O pins be used as both inputs and outputs?
- What kind of applications is the PCF8575PWRE4 suitable for?
The device is suitable for telecom shelters, servers, routers, personal computers, personal electronics, industrial automation, and products with GPIO-limited processors.
- How do you read data from the PCF8575PWRE4?
To read data from the ports, all desired input ports should be set to logic 1 before the read operation.
