Overview
The PCA9626B,118, produced by NXP USA Inc., is an I²C-bus controlled 24-bit LED driver designed for optimizing voltage switch dimming and blinking of 100 mA Red/Green/Blue/Amber (RGBA) LEDs. This device is part of the Fast-mode Plus (Fm+) family, offering higher frequency operation (up to 1 MHz) and more densely populated bus operation (up to 4000 pF).
Key Specifications
| Parameter | Value |
|---|---|
| Number of LED Outputs | 24 |
| Individual PWM Controller Resolution | 8-bit (256 steps) |
| Individual PWM Controller Frequency | 97 kHz |
| Group PWM Controller Frequency | Fixed: 190 Hz, Adjustable: 24 Hz to once every 10.73 seconds |
| PWM Duty Cycle Range | 0% to 99.6% |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Output Current per LED | 100 mA |
| Maximum Output Voltage | 40 V |
| I²C-Bus Frequency | Up to 1 MHz |
| Hardware Address Pins | 7 (allowing up to 126 devices on the same bus) |
| Package Type | LQFP48 |
Key Features
- Individual and group PWM control for each LED output, allowing for precise brightness and blinking control.
- Active LOW Output Enable (OE) input pin for hardware blinking and dimming of LEDs without software control.
- Software programmable LED Group and three Sub Call I²C-bus addresses, enabling addressing of all or defined groups of devices.
- Seven hardware address pins allowing up to 126 devices on the same I²C-bus.
- Software Reset (SWRST) Call for resetting the device through the I²C-bus, similar to Power-On Reset (POR).
- A new ‘Chase Byte’ feature for enabling or disabling selective LED outputs, useful for creating marquee chasing effects.
Applications
- LED lighting systems in consumer electronics, such as backlighting for displays and indicators.
- Automotive lighting systems, including dashboard and ambient lighting.
- Industrial automation and control panels requiring customizable LED displays.
- Signage and advertising displays where dynamic LED patterns are needed.
Q & A
- What is the PCA9626B,118 used for?
The PCA9626B,118 is used for controlling and dimming 100 mA Red/Green/Blue/Amber (RGBA) LEDs through an I²C-bus interface.
- What is the resolution of the individual PWM controllers?
The individual PWM controllers have an 8-bit resolution, allowing for 256 steps of brightness control.
- What is the frequency range of the group PWM controller?
The group PWM controller has a fixed frequency of 190 Hz and an adjustable frequency between 24 Hz to once every 10.73 seconds.
- What is the maximum output voltage per LED?
The maximum output voltage per LED is 40 V.
- How many devices can be connected to the same I²C-bus?
Up to 126 devices can be connected to the same I²C-bus using the seven hardware address pins.
- What is the purpose of the ‘Chase Byte’ feature?
The ‘Chase Byte’ feature allows for enabling or disabling selective LED outputs, which is useful for creating repetitive patterns like marquee chasing effects.
- How can multiple devices be dimmed or blinked together without software control?
Multiple devices can be dimmed or blinked together using the active LOW Output Enable (OE) input pin.
- What is the supply voltage range for the PCA9626B,118?
The supply voltage range is from 2.3 V to 5.5 V.
- Can the PCA9626B,118 be reset through the I²C-bus?
- What package type is the PCA9626B,118 available in?
The PCA9626B,118 is available in an LQFP48 package.
