Overview
The PCF8575PW, 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 over a supply voltage range of 2.5 to 5.5 volts and is available in various package types, including TSSOP-24. It is particularly useful for expanding the I/O capabilities of microcontrollers with limited GPIO resources.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage | 2.5 to 5.5 | V |
| Standby Current Consumption | 10 μA (maximum) | μA |
| I2C Bus Speed | 400 kbits/s (FAST I2C-bus) | kbits/s |
| Number of I/O Ports | 16-bit quasi-bidirectional | - |
| Interrupt Output | Open-drain | - |
| Package Type | TSSOP-24, SSOP-24, QSOP-24, SOIC-24, VQFN-24 | - |
| Operating Temperature Range | -40°C to 85°C | °C |
Key Features
- I2C to parallel-port expander with 16-bit quasi-bidirectional I/O ports (P07–P00, P17–P10)
- Low standby current consumption of 10 μA maximum
- Open-drain interrupt output for notifying the microcontroller of changes on the I/O ports
- Latched outputs with high current drive capability for directly driving LEDs
- Addressable by 3 hardware address pins, allowing up to 8 devices on the same bus
- Compatible with most microcontroller families via the I2C interface
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 operating supply voltage range of the PCF8575PW?
The PCF8575PW operates over a supply voltage range of 2.5 to 5.5 volts.
- What is the maximum standby current consumption of the PCF8575PW?
The maximum standby current consumption is 10 μA.
- What is the speed of the I2C bus supported by the PCF8575PW?
The device supports up to 400 kbits/s (FAST I2C-bus).
- How many I/O ports does the PCF8575PW have?
The PCF8575PW has a 16-bit quasi-bidirectional I/O port.
- What type of interrupt output does the PCF8575PW have?
The PCF8575PW has an open-drain interrupt output.
- Can the PCF8575PW drive LEDs directly?
Yes, the latched outputs have high current drive capability for directly driving LEDs.
- How many devices can be addressed on the same I2C bus using the PCF8575PW?
Up to 8 devices can be addressed using the 3 hardware address pins.
- What is the operating temperature range of the PCF8575PW?
The operating temperature range is -40°C to 85°C.
- In what package types is the PCF8575PW available?
The PCF8575PW is available in TSSOP-24, SSOP-24, QSOP-24, SOIC-24, and VQFN-24 packages.
- Is the PCF8575PW compatible with most microcontroller families?
Yes, it is compatible with most microcontroller families via the I2C interface.
