AS1115 LED Driver IC

Description

The AS1115 is a compact LED driver for 64 single LEDs or 8 digits of 7-segments. The devices can be programmed via an I²C compatible 2-wire interface. Every segment can be individually addressed and updated separately. Only one external resistor (RSET) is required to set the current. LED brightness can be controlled by analog or digital means.

The devices include an integrated BCD code-B/HEX decoder, multiplex scan circuitry, segment and display drivers, and a 64-bit memory. Internal memory stores the shift register settings, eliminating the need for continuous device reprogramming.

All outputs of the AS1115 can be configured for key readback. Key-switch status is obtained by polling for up to 64 keys while 16 keys can be used to trigger an interrupt.

Additionally the AS1115 offers a diagnostic mode for easy and fast production testing. The AS1115 features a low shutdown current of typically 200nA, and an operational current of typically 350μA. The number of digits can be programmed, the devices can be reset by software, and an external clock is also supported.

The device is available in a QSOP-24 and the TQFN(4x4)-24 package.

Key Features

• 3.4MHz I²C-Compatible Interface
• Individual LED Segment Control
• Readback for 16 Keys plus Interrupt
• Open and Shorted LED Error Detection
  • Global or Individual Error Detection
• Hexadecimal- or BCD-Code for 7-Segment Displays
• 200nA Low-Power Shutdown Current (typ; data retained)
• Digital and Analog Brightness Control
• Display Blanked on Power-Up
• Drive Common-Cathode LED Displays
• Supply Voltage Range: 2.7V to 5.5V
• Software Reset
• Optional External Clock
• Package:
  • QSOP-24
  • TQFN(4x4)-24

Applications

The AS1115 is ideal for seven-segment or dot matrix user interface displays of set-top boxes, VCRs, DVD players, washing machines, microwave ovens, refrigerators and other white good or personal electronic applications.

Block Diagram