Overview
The PCA9955TW, produced by NXP USA Inc., is a 16-channel Fm+ I2C-bus constant current LED driver. This device is optimized for dimming and blinking applications, making it suitable for a wide range of lighting control systems. It features advanced programmability and control over LED brightness and blinking patterns, enhancing its versatility in various lighting solutions.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Channels | 16 |
| Constant Current per Channel | 57 mA |
| Brightness Control | 256-step (8-bit) linear programmable brightness per LED output |
| Group Brightness Control | 256-step group brightness control using a 122 Hz PWM signal |
| Blinking Control | 256-step group blinking with frequency programmable from 15 Hz to 16.8 s and duty cycle from 0% to 99.6% |
| Output Enable | Active LOW Output Enable (OE) input pin (not available on PCA9955TW, but mentioned for comparison with PCA9952) |
| Addressing | Four hardware address pins and four software programmable I2C-bus addresses |
| Power Supply Voltage | 3 V to 5.5 V |
| Input Tolerance | 5.5 V tolerant inputs on non-LED pins |
| Internal Oscillator | 8 MHz internal oscillator |
| Standby Current | Low standby current |
| Package Type | HTSSOP28 |
Key Features
- Advanced 256-step (8-bit) linear programmable brightness control per LED output and group brightness control using a 122 Hz PWM signal.
- 256-step group blinking with programmable frequency and duty cycle.
- Output state change programmable on the Acknowledge or the STOP Command.
- Four hardware address pins and four software programmable I2C-bus addresses for flexible addressing.
- Software Reset feature (SWRST Call) for resetting the device through the I2C-bus.
- No glitch on LED on power-up and low standby current.
- Internal power-on reset and noise filter on SDA/SCL inputs.
Applications
The PCA9955TW is suitable for various lighting applications, including:
- Automotive lighting systems.
- Industrial lighting control systems.
- Consumer electronics with advanced lighting features.
- Signage and display lighting.
- Smart home lighting solutions.
Q & A
- What is the PCA9955TW used for?
The PCA9955TW is a 16-channel constant current LED driver used for dimming and blinking applications in various lighting systems.
- How many channels does the PCA9955TW have?
The PCA9955TW has 16 channels.
- What is the constant current per channel?
The constant current per channel is 57 mA.
- How is the brightness controlled?
Brightness is controlled through 256-step (8-bit) linear programmable brightness per LED output and group brightness control using a 122 Hz PWM signal.
- Can the blinking frequency be programmed?
- What is the power supply voltage range?
The power supply voltage range is 3 V to 5.5 V.
- Does the PCA9955TW have hardware address pins?
- Is there an internal oscillator?
- What is the package type of the PCA9955TW?
The package type is HTSSOP28.
- Can the device be reset through the I2C-bus?
