Overview
The PCA9539APW118, produced by NXP USA Inc., is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander designed for I²C-bus/SMBus applications. This device provides a simple solution for expanding the I/O capabilities of microprocessors and microcontrollers, particularly in scenarios where additional I/Os are required without increasing the interconnections. It is part of the PCA9539A series, which is known for its flexibility and low power consumption.
Key Specifications
| Specification | Value |
|---|---|
| Number of GPIOs | 16 bits |
| Operating Power Supply Voltage | 1.65 V to 5.5 V |
| Standby Current Consumption | 1.5 μA (typical at 5 V VDD), 1.0 μA (typical at 3.3 V VDD) |
| I²C-bus Speed | 400 kHz Fast-mode |
| Interrupt Output | Open-drain active LOW |
| Reset Input | Active LOW reset input |
| ESD Protection | 2000 V Human Body Model, 1000 V Charged-Device Model |
| Package Types | TSSOP24, HWQFN24 |
| I/O Drive Capability | 25 mA maximum for directly driving LEDs |
Key Features
- I²C-bus to parallel port expander
- Pin and function compatible with PCA9539
- Schmitt-trigger action on SCL and SDA inputs for better noise immunity
- 5 V tolerant I/Os
- Internal power-on reset
- Power-up with all channels configured as inputs, no glitch on power-up
- Latched outputs with 25 mA drive capability for directly driving LEDs
- ESD protection exceeds JESD22 standards
Applications
The PCA9539APW118 is suitable for a variety of applications, including ACPI power switches, sensors, push buttons, LEDs, fan control, and other scenarios where additional I/O expansion is needed. It is particularly useful in automotive, consumer electronics, and industrial control systems where low power consumption and flexible I/O configuration are essential.
Q & A
- What is the PCA9539APW118 used for? The PCA9539APW118 is a 16-bit GPIO expander used to expand the I/O capabilities of microprocessors and microcontrollers.
- What is the operating voltage range of the PCA9539APW118? The operating voltage range is from 1.65 V to 5.5 V.
- What is the standby current consumption of the PCA9539APW118? The standby current consumption is typically 1.5 μA at 5 V VDD and 1.0 μA at 3.3 V VDD.
- What is the I²C-bus speed of the PCA9539APW118? The I²C-bus speed is up to 400 kHz Fast-mode.
- Does the PCA9539APW118 have ESD protection? Yes, it has ESD protection exceeding JESD22 standards (2000 V Human Body Model, 1000 V Charged-Device Model).
- What are the package types available for the PCA9539APW118? The device is available in TSSOP24 and HWQFN24 packages.
- Can the PCA9539APW118 drive LEDs directly? Yes, it can drive LEDs directly with a maximum drive capability of 25 mA.
- How are the I/Os configured at power-up? At power-up, all I/Os are configured as high-impedance inputs.
- Does the PCA9539APW118 have an internal power-on reset? Yes, it has an internal power-on reset.
- What is the purpose of the interrupt output on the PCA9539APW118? The interrupt output is an open-drain active LOW output used to signal events to the microcontroller.
