Overview
The PCA9531PW,112 is an 8-bit I²C-bus and SMBus I/O expander optimized for dimming LEDs, produced by NXP USA Inc. This component is designed to provide flexible control over LED lighting, including RGB color mixing and backlight applications. It features an internal oscillator with programmable blink rates and duty cycles, allowing for precise control over LED brightness and blinking patterns.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TSSOP-16 |
| Number of Bits | 8-bit |
| Interface | I²C-bus, SMBus |
| Maximum I²C Speed | 400 kHz |
| Output Type | Open-drain |
| Maximum Output Sink Current per Bit | 25 mA |
| Maximum Output Sink Current per Package | 100 mA |
| Address Pins | 3 (allowing 8 devices on the same bus) |
| Reset Type | Active LOW hardware reset, Power-On Reset (POR) |
Key Features
- Eight LED drivers with programmable on, off, and blinking at two selectable rates
- Internal oscillator with two user-programmable blink rates and duty cycles
- PWM control for LED brightness adjustment
- General Purpose parallel Input/Output (GPIO) expansion for unused LED pins
- Three hardware address pins allowing up to eight devices on the same bus
- Active LOW hardware reset and Power-On Reset (POR) for initialization
Applications
The PCA9531PW,112 is suitable for various applications including LED lighting systems, backlight control, RGB color mixing, and general-purpose I/O expansion. It is particularly useful in scenarios where additional I/O is needed for controlling devices such as ACPI power switches, sensors, push-buttons, and alarm monitoring systems.
Q & A
- What is the primary function of the PCA9531PW,112? The primary function is to provide 8-bit I²C-bus and SMBus I/O expansion optimized for dimming LEDs.
- What is the maximum I²C speed supported by the PCA9531PW,112? The maximum I²C speed is 400 kHz.
- How many devices can be connected on the same bus using the PCA9531PW,112? Up to eight devices can be connected on the same bus due to the three hardware address pins.
- What is the maximum output sink current per bit and per package? The maximum output sink current per bit is 25 mA, and per package is 100 mA.
- Can the PCA9531PW,112 be used for general-purpose I/O expansion? Yes, unused LED pins can be used as General Purpose parallel Input/Output (GPIO).
- How does the PCA9531PW,112 control LED brightness? The component controls LED brightness using PWM with programmable blink rates and duty cycles.
- What type of reset does the PCA9531PW,112 have? It has an active LOW hardware reset and a Power-On Reset (POR).
- What package type is the PCA9531PW,112 available in? It is available in a TSSOP-16 package.
- Is the PCA9531PW,112 suitable for RGB color mixing? Yes, it is optimized for RGB color mixing and backlight applications.
- Can the PCA9531PW,112 be used in applications other than LED control? Yes, it can be used for controlling other devices such as ACPI power switches, sensors, and push-buttons.
