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12-Channel RGB-LED Driver Targets Wearables

STMicroelectronics’ LED1202 12-channel LED driver enables smoother and more natural interactions with smart-home devices, wearable electronics and small appliances. It provides patented features to prevent distracting artefacts in “color-chasing” or “deep breathing” LED animation effects.

The LED1202 can store eight programmable patterns and sequences and operate independently of the main controller, enabling the host system to save power while sophisticated lighting effects run continuously. 12-bit internal PWM dimming enables precision control of programmed sequences and the main controller can set 8-bit values for analog dimming via the driver’s I2C interface. Minimal external components are required to complete the driver circuit.

With 12 output channels, a single LED1202 can drive four RGB LEDs at up to 20mA per channel. An innovative synchronization feature allows connecting up to eight LED1202 drivers to control larger LED arrays. In addition, superior low-current channel matching, within 2% (typical) at 2.5mA, enhances color consistency. Phase shifting between channels minimizes current ripple and prevents excessive peak demand. Built-in safety features include open-LED detection, over-temperature protection, and a fault-flag pin.

Available now, the LED1202JR in 1.71mm x 2.16mm WLCSP-20 flip-chip is $0.90 and the LED1202QTR in 3mm x 3mm VFQFPN-20 is $1.15 for orders of 1,000 pieces.

The STEVAL-LLL007V1 evaluation kit is available to support evaluation of the LED1202 and aids development of new products and lighting sequences.

STMicroelectronics | www.st.com

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