Product Overview
PCAL6524HEAZ from NXP is a 24-bit I2C GPIO expander with programmable pull-up/pull-down, interrupt, latch. HVQFN-28.
Working Principle
Advanced I2C GPIO expander with 24 quasi-bidirectional I/O pins. Programmable pull-up/pull-down resistors. Input latch for stable reads. Interrupt output on input change. Software reset. 400kHz I2C. 1.65-5.5V I/O with level translation.
Pin Description
| Pin Group | Function | Count |
|---|---|---|
| P0-P2 | GPIO ports | 24 |
| I2C | SDA/SCL | 2 |
| INT | Interrupt | 1 |
Applications
- GPIO expansion
- LED control
- Keyboard scanning
- Industrial I/O
Alternative Models
| Mfr | Part | Notes |
|---|---|---|
| NXP | PCAL6416AHEAZ | 16-bit version |