The IS31FL3732 and IS31FL3732C drivers support two arrays of 72 LEDs, for a total of 144 LEDs, which can be individually dimmed in 256 steps (8-bit) with 1/9 cycle rate. The signals to drive all 144 LEDs are multiplexed to a reduced count of 18 that requires fewer traces and optimizes PCB space. The IS31FL3732 / IS31FL3732C drivers integrate 8 frames of memory, which can be displayed with programmable time delays to create LED matrix animations. For an extra dimension of animation, analog inputs such as audio signals can be used to modulate the LED display intensity.
IS31FL3732 / IS31FL3732C drivers also allow multiple ICs to be synchronized without additional external components for applications such as Bluetooth® speakers, internet gaming peripheral devices, white good appliances, toys, and personal electronics. The device’s operating voltage of 2.7V to 5.5V over the industrial temperature range of -40°C to +85°C offers individual blink, on/off control, 256 step global current control, and auto intensity breathing during the switching of different frames. ISSI IS31FL3731 and IS31FL3731C LED Drivers are available in QFN-28 (4mm × 4mm) and SSOP-28 packages.