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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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12-Channel RGB-LED Driver Targets Wearables

by Circuit Cellar Staff time to read: 1 min