NXP USA Inc. PCA6408ABSHP

The PCA6408ABSHP, manufactured by NXP USA Inc., is an 8-bit general-purpose I/O expander designed to provide remote I/O expansion for most microcontroller families via the I2C-bus interface. This component is particularly useful in applications where additional I/Os are required without increasing the complexity of interconnections. It is especially beneficial in battery-powered mobile applications for interfacing with sensors, push buttons, and keypads. The PCA6408ABSHP features bidirectional voltage level translation, making it highly flexible in mixed signal environments where communication between incompatible I/O voltages is necessary.

• Bidirectional Voltage Level Translation: Allows communication between different voltage levels, enhancing flexibility in mixed signal environments.
• Agile I/O Features: Includes programmable output drive strength, latchable inputs, programmable pull-up/pull-down resistors, maskable interrupt, and interrupt status register.
• Configuration Registers: Includes 8-bit Configuration, Input, Output, and Polarity Inversion registers, allowing for flexible configuration of I/Os.
• Interrupt Output: Open-drain interrupt output that indicates changes in input state, useful for notifying the microcontroller without continuous I2C-bus communication.
• ESD Protection: Exceeds JESD 22 standards with 2000 V Human-Body Model and 1000 V Charged-Device Model.
• Power-On Reset: Initializes the I2C-bus/SMBus state machine and sets registers to their default state.

• Battery-Powered Mobile Applications: Ideal for interfacing with sensors, push buttons, and keypads in mobile devices.
• Mixed Signal Environments: Suitable for applications requiring communication between different voltage levels.
• Industrial Automation: Can be used in various industrial automation scenarios where additional I/Os are needed without increasing complexity.
• Consumer Electronics: Useful in consumer electronics for expanding I/O capabilities of microcontrollers.

1. What is the primary function of the PCA6408ABSHP?

   The PCA6408ABSHP is an 8-bit general-purpose I/O expander that provides remote I/O expansion for most microcontroller families via the I2C-bus interface.

2. What is the supply voltage for the PCA6408ABSHP?

   The supply voltage for the PCA6408ABSHP is 1.8 V.

3. What package type is the PCA6408ABSHP available in?

   The PCA6408ABSHP is available in a 16-VFQFN Exposed Pad package.

4. What are the key features of the Agile I/O in the PCA6408ABSHP?

   The Agile I/O features include programmable output drive strength, latchable inputs, programmable pull-up/pull-down resistors, maskable interrupt, and interrupt status register.

5. How does the PCA6408ABSHP handle voltage level translation?

   The PCA6408ABSHP provides bidirectional voltage level translation, allowing communication between different voltage levels.

6. What is the purpose of the interrupt output in the PCA6408ABSHP?

   The interrupt output is used to indicate changes in input state to the system master without continuous I2C-bus communication.

7. What is the operating temperature range for the PCA6408ABSHP?

   The operating temperature range is -40°C to +85°C.

8. Does the PCA6408ABSHP have ESD protection?

   Yes, the PCA6408ABSHP exceeds JESD 22 standards with 2000 V Human-Body Model and 1000 V Charged-Device Model.

9. How are the I/Os configured at power-on?

   At power-on, the I/Os are configured as inputs, but the system master can enable them as either inputs or outputs by writing to the I/O configuration bits.

10. What is the significance of the Polarity Inversion register in the PCA6408ABSHP?

    The Polarity Inversion register allows the polarity of the Input Port register to be inverted, saving external logic gates.