Overview
The PCA6408AHKX, produced 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 device is particularly useful in scenarios where additional I/Os are needed while minimizing interconnections, especially in battery-powered mobile applications. It offers a flexible set of GPIOs and includes built-in level shifting, making it highly versatile in mixed signal environments where communication between incompatible I/O voltages is required.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | XQFN16 (extremely thin quad flat package, no leads, 16 terminals) |
| Operating Power Supply Voltage Range | 1.65 V to 5.5 V |
| I²C-bus Interface Speeds | 100 kHz and 400 kHz |
| Number of GPIOs | 8-bit |
| Output Drive Capability | 25 mA sink capability for directly driving LEDs |
| Interrupt Output | Open-drain active LOW interrupt output (INT) |
| ESD Protection | 2000 V Human-Body Model, 1000 V Charged-Device Model |
| Addressing | One hardware pin (ADDR) for programming and varying the fixed I²C-bus address |
Key Features
- I²C-bus to parallel port expander
- Bidirectional voltage-level translation and GPIO expansion between different voltage levels (e.g., 1.8 V, 2.5 V, 3.3 V, 5 V)
- Input/Output Configuration register and Polarity Inversion register
- Internal power-on reset and power-up with all channels configured as inputs
- No glitch on power-up and noise filter on SCL/SDA inputs
- Latched outputs with 25 mA drive maximum capability for directly driving LEDs
- Latch-up performance exceeds 100 mA per JESD 78, Class II
Applications
The PCA6408AHKX is suitable for various applications, including battery-powered mobile devices, sensors, push buttons, keypads, and any scenario where additional I/Os are required without increasing the complexity of the system. It is particularly useful in mixed signal environments where communication between different voltage levels is necessary. This device is also ideal for expanding the I/O capabilities of microcontrollers in a wide range of electronic systems.
Q & A
- What is the PCA6408AHKX?
The PCA6408AHKX is an 8-bit general purpose I/O expander with an I²C-bus interface, designed to provide remote I/O expansion for most microcontroller families. - What are the operating voltage ranges of the PCA6408AHKX?
The device operates between 1.65 V and 5.5 V. - What are the I²C-bus interface speeds supported by the PCA6408AHKX?
The device supports I²C-bus interface speeds of 100 kHz and 400 kHz. - What is the output drive capability of the PCA6408AHKX?
The device has a 25 mA sink capability for directly driving LEDs. - Does the PCA6408AHKX have built-in level shifting?
Yes, the PCA6408AHKX includes built-in level shifting, allowing for bidirectional voltage-level translation. - What type of package does the PCA6408AHKX come in?
The PCA6408AHKX comes in an XQFN16 package. - How many GPIOs does the PCA6408AHKX provide?
The PCA6408AHKX provides 8-bit GPIOs. - What kind of ESD protection does the PCA6408AHKX offer?
The device offers ESD protection exceeding 2000 V Human-Body Model and 1000 V Charged-Device Model. - Can multiple PCA6408AHKX devices share the same I²C-bus?
Yes, up to two devices can share the same I²C-bus or SMBus using the ADDR pin for address programming. - What is the purpose of the internal power-on reset in the PCA6408AHKX?
The internal power-on reset ensures that the device starts in a defined state with all channels configured as inputs and no glitches on power-up.
