This part is a kind of semiconductor called TM1803.

Function of this product has 3-bit LED drive control dedicated circuit.

Manufacturers : Titan Micro

Image and pinout :

Some of the text within the PDF file :

3bit LED drive control dedicated circuit TM1803 Summarize TM1803 is a 3 bits LED (light-emitting diode display) drive control circuit, internal integrated with MCU digital interface, latch, LED high voltage driver and so on .Through the external MCU control, the chip can achieve separate luminance, And through cascade control can achieve outdoor large-screen color dot-matrix light-emitting control. TM1803 have excellent performance and high reliability. Feature z z z z z Use high-voltage power CMOS process Output voltage is up to 24V Brightness adjustment circuit(256) Serial-shift and cascade Interface Oscillation mode：Built-in RC oscillator, signal clock synchronization. While accepting the completed data of this module, data can be auto-shaped and transmitted to next chip via data o [ ... ]

TM1803 PDF Datasheet Download