austriamicrosystems AS1116 64 路LED驱动方案

austriamicrosystems 公司的AS1116是带误差检测的 64 路LED驱动器，能驱动64个LED或8位7段LED，器件还可通过10MHz SPI兼容的3线接口进行编程。AS1116具有LED开路或短路检测，全部或单个误差检测，可进行单位亮度控制。工作电压为2.7V到5.5V，关断电流仅为200nA. AS1116可用作公共信息显示屏的点阵显示或7段显示如地铁，火车或公交站，机场以及手机，个人电子设备和玩具等。本文介绍了AS1116的主要特性以及典型应用方框图和LED点阵显示驱动案例。

austriamicrosystems AS1116 64 LED Driver with Detailed Error Detection
The AS1116 is a compact LED driver for 64 single LEDs or 8 digits of 7-segments. The devices can be programmed via an SPI compatible 3-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.
Additionally the AS1116 offers a diagnostic mode for easy and fast production testing and allows the use of the AS1116 for critical applications. The diagnostic allows to detect individual open or shorted LEDs.
The AS1116 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 TQFN(4x4)-24 package.

AS1116主要特性：
10MHz SPI-Compatible Interface
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)
Individual Digit Brightness Control
Digital and Analog Brightness Control
Display Blanked on Power-Up
Drive Common-Cathode LED Displays
Supply Voltage Range: 2.7 to 5.5V
Software Reset
Optional External Clock
Package:
QSOP-24 and TQFN(4x4)-24

AS1116应用：
The AS1116 is ideal for seven-segment or dot matrix displays in public information displays at subway, train or bus stations, at airports and also at displays in public
transportation like buses or trains mobile phones, personal electronic and toys.



图1。AS1116典型应用方框图



图2。AS1116 LED点阵驱动案例