Overview
The PCA9745BTWJ, produced by NXP USA Inc., is a highly advanced 16-channel constant current LED driver. This device is optimized for controlling and dimming Red/Green/Blue/Amber (RGBA) LEDs, particularly in applications requiring precise brightness control and dynamic effects such as dimming and blinking. The PCA9745BTWJ is part of the PCA9745B family and is designed to operate via a daisy-chain SPI-compatible 4-wire serial bus interface, enabling efficient and flexible control over multiple LED channels.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Channels | 16 |
| Output Current per Channel | Up to 57 mA |
| Output Voltage Tolerance | Up to 20 V when OFF |
| PWM Frequency | 31.25 kHz (individual), 122 Hz (group), adjustable from 15 Hz to once every 16.8 seconds |
| PWM Resolution | 8-bit (256 steps) for both individual and group PWM controllers |
| Supply Voltage Range | 3 V to 5.5 V |
| Serial Bus Interface | 4-wire SPI-compatible, up to 25 MHz data clock rate |
| Package Type | 28-HTSSOP |
| Output Current Accuracy | ±4% between output channels, ±6% between devices |
Key Features
- Each LED output programmable to be off, fully on, or controlled by individual or group PWM controllers.
- Programmable LED brightness with 256-step (8-bit) resolution for both individual and group PWM controllers.
- Gradation control for all channels with programmable ramp-up and ramp-down times and rates.
- Output current adjustable through an external resistor (Rext input).
- Open/short load/overtemperature detection mode for individual LED error detection.
- Active LOW output enable input pin (OE) for external dimming/blinking control.
- Support for linear and exponential brightness adjustment curves.
Applications
The PCA9745BTWJ is particularly suited for applications requiring sophisticated LED control, such as:
- Amusement products and gaming machines.
- Automotive lighting systems.
- Industrial lighting and signage.
- Consumer electronics with dynamic LED displays.
- Any application needing precise and flexible LED dimming and blinking control.
Q & A
- What is the PCA9745BTWJ used for?
The PCA9745BTWJ is a 16-channel constant current LED driver used for controlling and dimming LEDs in various applications.
- How many channels does the PCA9745BTWJ have?
The PCA9745BTWJ has 16 LED driver channels.
- What is the maximum output current per channel?
The maximum output current per channel is up to 57 mA.
- What is the PWM frequency range for individual LED channels?
The PWM frequency for individual LED channels is 31.25 kHz.
- Can the PCA9745BTWJ be daisy-chained?
Yes, the PCA9745BTWJ supports daisy-chaining through its SPI-compatible 4-wire serial bus interface.
- What is the supply voltage range for the PCA9745BTWJ?
The supply voltage range is from 3 V to 5.5 V.
- How accurate is the output current between channels and devices?
The output current accuracy is ±4% between output channels and ±6% between devices.
- Does the PCA9745BTWJ support external dimming/blinking control?
Yes, it supports external dimming/blinking control through the active LOW output enable input pin (OE).
- What types of brightness adjustment curves are supported?
The PCA9745BTWJ supports both linear and exponential brightness adjustment curves.
- What package type is the PCA9745BTWJ available in?
The PCA9745BTWJ is available in a 28-HTSSOP package.
