说明：  TM1668 功能介绍，经典应用及时序控制。（TM1668 是一种带键盘扫描接口的LED（发光二极管显示器）驱动控制专用电路，内 部集成有MCU 数字接口、数据锁存器、LED 高压驱动、键盘扫描等电路。）
(TM1668 features of classic application and timing control. (TM1668 is a scanner with a keyboard interface, LED (light emitting diode display) dedicated drive control circuit within the integrated MCU digital interface, data latches, LED high voltage driver, the keyboard scanning circuit.))