PCF8575T in PCF8574 / MCP23017 I/O Expanders Family
The PCF8575T is a 16-bit I/O expander designed for I2C-bus applications, manufactured primarily by NXP Semiconductors and Texas Instruments. It provides remote I/O expansion for most microcontroller families via a two-line bidirectional bus. Each of the 16 ports can be independently configured as an input or an output. The device consists of a 16-bit quasi-bidirectional port and an I2C-bus interface, featuring a low current consumption and a high-current drive capability for directly powering LEDs.
Variants within the PCF8575 family typically differ by packaging options, such as SO24 (T suffix), SSOP24, or HVQFN24, and temperature ratings. While the core 16-bit quasi-bidirectional logic remains consistent, different manufacturers may offer slight variations in the maximum I2C clock frequency or voltage thresholds. Some specific part numbers like PCF8575TS indicate a shrink small outline package, whereas the standard T variant denotes the standard small outline package.
