AS1117 LED Driver IC for mobile applications

Description

The AS1117 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.

The AS1117 offers a low voltage I/O stage compatible to low voltage/power µC in mobile applications as well as an hardware reset pin.

Additionally the AS1117 offers a detailed error diagnostic mode for easy and fast production testing in critical applications. The AS1117 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 TQFN(4x4)-24 package.

Key Features

• 3.4MHz I²C-Compatible Interface
• Individual LED Segment Control
• Readback for 8 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 & Hardware Reset
• Optional External Clock
• Package: TQFN(4x4)-24

Applications

The AS1117 is ideal for seven-segment or dot matrix user interface displays in mobile phones or other portable applications.

Block diagram for AS1117 LED Driver IC for mobile applications