The PCU9955A 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 LED 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 100 % to allow the LED to be set to a specific brightness value. An additional 8-bit resolution (256 steps) group PWM controller has both a fixed frequency of 122 Hz and an adjustable frequency between 15 Hz to once every 16.8 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all LEDs with the same value.
Each LED output can be off, on (no PWM control), set at its individual PWM controller value or at both individual and group PWM controller values. The PCU9955A operates with a supply voltage range of 3 V to 5.5 V and the constant current sink LED outputs allow up to 20 V for the LED supply. The output peak current is adjustable with an 8-bit linear DAC from 225 μA to 57 mA.
Gradation control for all current sources is achieved via the I²C-bus serial interface and allows user to ramp current automatically without MCU intervention. 8-bit DACs are available to adjust brightness levels for each LED current source. There are four selectable gradation control groups and each group has independently four registers to control ramp-up and ramp-down rate, step time, hold ON/OFF time and final hold ON output current. Two gradation operation modes are available for each group, one is single shot mode (output pattern once) and the other is continuous mode (output pattern repeat). Each channel can be set to either gradation mode or normal mode and assigned to any one of these four gradation control groups.
This device has built-in overtemperature detection circuitry. A thermal shutdown feature protects the device when internal junction temperature exceeds the limit allowed for the process.
The PCU9955A 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 the PCU9955A are supported. As such, there are no status registers in PCU9955A. The PCU9955A allows significantly higher data transfer rate compared to the Fast-mode Plus version (PCA9955A).
The active LOW output enable input pin (OE) blinks all the LED outputs and can be used to externally PWM the outputs, which is useful when multiple devices must be dimmed or blinked together without using software control.
Software programmable LED Group and three Sub Call I²C-bus addresses allow all or defined groups of PCU9955A devices to respond to a common I²C-bus address, allowing for example, all red LEDs to be turned on or off at the same time or marquee chasing effect, thus minimizing I²C-bus commands. On power-up, PCU9955A has a unique Sub Call address to identify it as a 16-channel LED driver. This allows mixing of devices with different channel widths. Three hardware address pins on PCU9955A allow up to 125 devices on the same bus.
The Software Reset (SWRST) function allows the master to perform a reset of the PCU9955A through the I²C-bus, identical to the Power-On Reset (POR) that initializes the registers to their default state causing the output current switches to be OFF (LED off). This allows an easy and quick way to reconfigure all device registers to the same condition.