Overview
The PCA9539PW,118, produced by NXP USA Inc., is a 24-pin CMOS device designed to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion. This device is part of the NXP Semiconductors family of I2C-bus I/O expanders, enhancing the capability to add additional I/Os for various applications such as ACPI power switches, sensors, push buttons, LEDs, and fans.
The PCA9539PW,118 is particularly useful in scenarios where more I/O lines are needed beyond what the primary microcontroller can provide. It operates on the I2C-bus/SMBus interface, allowing for easy integration into existing systems.
Key Specifications
| Attribute | Specification |
|---|---|
| Interface Type | I2C/SMBus |
| Clock Frequency (Max.) | 400 kHz |
| Number of I/O Lines | 16 |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Package Style | 24-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to 85°C |
| Interrupt Output | Yes, Active LOW |
| Reset Input | Active LOW |
| Output Type | Push-Pull |
| Output Current (Source/Sink) | 10 mA, 25 mA |
Key Features
- 16-bit I2C-bus GPIO with interrupt and reset capabilities
- Operating power supply voltage range of 2.3 V to 5.5 V
- 5 V tolerant I/Os
- Polarity inversion register for active HIGH or active LOW operation
- Active LOW interrupt output and reset input
- Low standby current and internal power-on reset
- No glitch on power-up and noise filter on SCL/SDA inputs
- 16 I/O pins that default to inputs
Applications
The PCA9539PW,118 is versatile and can be used in a variety of applications where additional I/O lines are required. Some common uses include:
- ACPI power switches
- Sensors and monitoring systems
- Push buttons and user interfaces
- LED indicators and lighting control
- Fan control and other peripheral devices
Q & A
- What is the PCA9539PW,118 used for?
The PCA9539PW,118 is used to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications.
- What is the operating voltage range of the PCA9539PW,118?
The operating voltage range is from 2.3 V to 5.5 V.
- What is the maximum clock frequency supported by the PCA9539PW,118?
The maximum clock frequency is 400 kHz.
- How many I/O lines does the PCA9539PW,118 provide?
The device provides 16 I/O lines.
- What type of package does the PCA9539PW,118 come in?
The device comes in a 24-TSSOP package.
- Is the PCA9539PW,118 5 V tolerant?
Yes, the I/Os are 5 V tolerant.
- Does the PCA9539PW,118 have an interrupt output?
Yes, it has an active LOW interrupt output.
- How does the reset function work on the PCA9539PW,118?
The reset input is active LOW and can reset the device to its default state without de-powering it.
- What is the purpose of the polarity inversion register?
The polarity inversion register allows for the polarity of the read register to be inverted, enabling active HIGH or active LOW operation.
- Can multiple PCA9539PW,118 devices share the same I2C-bus?
Yes, up to four devices can share the same I2C-bus/SMBus using different address configurations set by hardware pins A0 and A1.
