Overview
The PCA9531PW118, manufactured by NXP USA Inc., is an 8-bit I2C-bus and SMBus I/O expander specifically optimized for dimming LEDs in various applications. This component is designed to provide precise control over LED brightness and color mixing, making it ideal for RGB color and backlight applications.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | HVQFN16 |
| Number of Bits | 8-bit |
| Bus Interface | I2C-bus and SMBus |
| LED Control | 256 discrete steps for RGB color mixing |
| Blink Rates | Two user-programmable blink rates and duty cycles |
| Output Current | Maximum output sink current of 25 mA per bit, 100 mA per package |
| Addressing | Three hardware address pins allowing eight devices on the same bus |
| Reset | Active LOW hardware reset pin (RESET) and Power-On Reset (POR) |
| GPIO Capability | Pins not used for LEDs can be used as General Purpose I/Os (GPIOs) |
Key Features
- Eight LED drivers with programmable on, off, and flashing rates
- Two selectable, fully programmable blink rates (frequency and duty cycle)
- Internal oscillator for PWM control
- GPIO expansion capability for additional I/O needs
- Active LOW hardware reset and Power-On Reset (POR) for initialization
- Three hardware address pins for multiple device operation on the same bus
- High-impedance output state for LED off condition
Applications
- LED dimming and color mixing in RGB and backlight applications
- ACPI power switches, sensors, push-buttons, alarm monitoring, and fan control
- General Purpose parallel Input/Output (GPIO) expansion in various electronic systems
- Automotive, industrial, and consumer electronics where precise LED control is required
Q & A
- What is the PCA9531PW118 used for?
The PCA9531PW118 is used for dimming LEDs in 256 discrete steps, particularly in RGB color and backlight applications.
- What type of bus interface does the PCA9531PW118 support?
The PCA9531PW118 supports I2C-bus and SMBus interfaces.
- How many blink rates can be programmed on the PCA9531PW118?
The PCA9531PW118 allows for two user-programmable blink rates and duty cycles.
- What is the maximum output current per bit and per package?
The maximum output sink current is 25 mA per bit and 100 mA per package.
- Can the PCA9531PW118 be used as a GPIO expander?
- How many devices can operate on the same bus using the PCA9531PW118?
Up to eight devices can operate on the same bus due to the three hardware address pins.
- What is the purpose of the active LOW hardware reset pin and Power-On Reset (POR)?
The active LOW hardware reset pin and Power-On Reset (POR) are used to initialize the device to its default state.
- What package type is the PCA9531PW118 available in?
The PCA9531PW118 is available in an HVQFN16 package.
- How does the PCA9531PW118 control LED brightness?
The LED brightness is controlled by setting the blink rate high enough and then using the duty cycle to vary the amount of time the LED is on.
- What are some common applications of the PCA9531PW118?
Common applications include LED dimming in RGB and backlight applications, ACPI power switches, sensors, and other electronic systems requiring precise LED control.
