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- Manufacturer: NXP Semiconductors - Model: PCAL6408AHKX - Interface: I2C-bus/SMBus - Number of I/O Pins: 8 - Features: Quasi-bidirectional I/O, Output Polarity Inversion, Active-High Interrupt Output Functions: - I/O expansion for microcontroller systems - Quasi-bidirectional data I/O pins - Support for hardware interrupt Applications: - Control and monitoring systems - Industrial automation - IoT devices - Consumer electronics Alternative Components: 1. Microchip MCP23008: 8-bit I/O expander with I2C interface 2. Texas Instruments TCA9554: 8-bit I2C and SMBus I/O expander 3. Maxim MAX7313: 16-bit I/O expander with I2C interface Embedded Modules: - I2C/SMBus Interface: for communication with a host microcontroller - Interrupt Logic: for generating hardware interrupts based on predefined conditions - Configurable I/O Pins: for flexible use as inputs or outputs Related Q&A: 1. Can the PCAL6408AHKX work with both 3.3V and 5V microcontrollers? - Yes, the PCAL6408AHKX supports a wide voltage range and can be used with both 3.3V and 5V microcontrollers. 2. How many PCAL6408AHKX devices can be connected on the same I2C bus? - You can connect multiple PCAL6408AHKX devices on the same I2C bus as long as each one has a unique I2C address. 3. Does the PCAL6408AHKX support internal pull-up resistors on its I/O pins? - Yes, the PCAL6408AHKX has internal pull-up resistors that can be enabled programmatically. 4. What is the maximum output drive capability of the PCAL6408AHKX? - The PCAL6408AHKX can drive up to 25mA per I/O pin, making it suitable for driving LEDs and other low-power loads. 5. Is it possible to cascade multiple PCAL6408AHKX devices for expanding the number of I/O pins further? - Yes, you can cascade multiple PCAL6408AHKX devices by assigning them unique I2C addresses and connecting them in series on the same I2C bus for expanding the number of available I/O pins.