PCU9955 Overview
Key Specifications
Mount Type: Surface Mount
Pins: 28
Operating Voltage: 3.3 V
Max Voltage (typical range): 5.5 V
Description
The PCU9955 is an Ultra-Fast mode (UFm) I2C-bus controlled 16-channel constant current LED driver optimized for dimming and blinking 57 mA Red/Green/Blue/Amber (RGBA) LEDs in amusement products. Each LEDn output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that operates at 31.25 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value.
Key Features
- protects the device when internal junction temperature exceeds the limit allowed for the process
- The PCU9955 device is the first LED controller device in a new Ultra Fast-mode (UFm) I2C-bus family
- UFm I2C-bus devices offer higher frequency (up to 5 MHz)
- The UFm I2C-bus slave devices operate in receive-only mode
- That is, only I2C writes to PCU9955 are supported
- As such, there are no status registers in PCU9955
- The PCU9955 allows significantly higher data transfer rate compared to the Fast-mode Plus versions (PCA9952/55)
- Software programmable LED Group and three Sub Call I2C-bus addresses allow all or defined groups of PCU9955 devices
