AS1107 LED Driver IC

Description

The AS1106 and the AS1107 are compact display drivers for 7-segment numeric displays of up to 8 digits. The devices can be programmed via SPI, QSPI, and Microwire as well as a conventional 4-wire serial interface.

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 LED settings, eliminating the need for continuous device reprogramming.

Every segment can be individually addressed and updated separately. Only one external resistor (RSET) is required to set the current through the LED display. LED brightness can be controlled by analog or digital means. The devices can be programmed to use the internal code-B/HEX decoder to display numeric digits or to directly address each segment.

The AS1106 and the AS1107 feature an extremely low shutdown current of typically 3µA, and an operational current of less than 500µA. The number of digits can be programmed, the devices can be reset by software, and an external clock is also supported. Additionally, segment blinking can be synchronized across multiple drivers. Several test modes are available for easy application debugging.

The devices are available in 24-pin DIP and 24-pin SOIC packages.

Key Features

• 10MHz SPI-, QSPI-, Microwire-Compatible Serial I/O
• Individual LED Segment Control
• Segment Blinking Control (can be synchronized across multiple drivers)
• Hexadecimal- or BCD-Code/No-Decode Digit Selection
• 3µA Low-Power Shutdown Current (typ; data retained)
• Extremely Low Operating Current 0.5mA in Open-Loop
• Digital and Analog Brightness Control
• Display Blanked on Power-Up
• Drive Common-Cathode LED Displays
• Low-EMI Low Slew-Rate Limited Segment Drivers (AS1107)
• Supply Voltage Range: 2.7 to 5.5V
• Software Reset
• Optional External Clock
• Packages:
  • 24-pin DIP
  • 24-pin SOIC

Applications

The AS1106 and AS1107 are ideal for bar-graph displays, instrument-panel meters, LED matrix displays, dot matrix displays, set-top boxes, white goods, professional audio equipment, medical equipment, industrial controllers and panel meters.

Block Diagram