Omron has launched a new LED matrix control chip aimed at LED arrays in signage, backlights and other applications. The new 7mm x 7mm chip can control the brightness of up to 128 individual LEDs with just one IC.
The firm claims that the new Omron W2RG012RN supports a smooth fade-in and fade-out of LED brightness with PWM gradation control, so that the transition is undetectable to the human eye at any point.
Key feature of the chip is that it controls brightness using a PWM function, increasing the brightness gradually, and increasing the rate of change exponentially as the light output increases.
Since the human eye is more sensitive to dimmer light, the use of PWM function gives the impression of a completely smooth and even change in brightness, with no perceptible steps or flickering. In contrast, conventional luminance control is in even steps which appear uneven to the eye due to its variable response to brightness.
The new chip can be controlled through a serial bus connection, which allows up to 15 ICs to be connected on the same communication line.
The 24 constant current outputs deliver a maximum current of 80mA per pin. They can be configured to support arrays of 16 x 8, 24 x 4, 24 x 2 or 24 x 1 LEDs. The brightness of each individual LED can be greater with the smaller arrays.
The device is just 7mm x 7mm in size and features a built-in thermal shut-down.