AS1119 144channel LED driver

Description

The AS1119 is a compact LED driver for 144 (90) single LEDs. The devices can be programmed via an I²C compatible interface.

The AS1119 offers two blocks driving each 72 LEDs (3 blocks each 30LEDs) with 1/9 (1/6) cycle rate. The required lines to drive all 144 (90 )LEDs are reduced to 18 by using the cross-plexing feature optimizing space on the PCB. Every block driving 72(30) LEDs can be analog dimmed from 1 to 30mA in 1mA steps.

Additionally each of the 144 (90) LEDs can be dimmed individually with 8-bit allowing 256 steps of linear dimming. To reduce CPU usage up to 6 frames can be stored with individual time delays between frames to play small animations automatically.

The AS1119 operates from 2.7V to 5.5V and includes a 320mA charge-pump to drive also white LEDs. The charge-pump operates in 2:3 and 1:2 mode.

The AS1119 features very low shutdown and operational current.

The device is available in a ultrasmall 36-pin WL-CSP.

Key Features

• 1MHz I²C-Compatible Interface
• Open and Shorted LED Error Detection
  - Global Detection of Shorts
  - Global Detections of Open
• 144 - LEDs in Dot Matrix
• Low-Power Shutdown Current
• Individual 8-bit LED PWM Control
• 8-bit Analog Brightness Control
• (1:1), 2:3, 1:2 320mA Charge Pump
• 6 Frames Memory for Animations
• Supply Voltage Range: 2.7V to 5.5V
• Minimum PCB space required
• 36-pin WL-CSP package

Applications

The AS1119 is ideal for dot matrix displays in mobile phones, personal electronic and toys.

Block diagram for AS1119 144channel LED driver