Very new to electronics outside base knowledge.
This board is from a small smartphone toy, where pressing and holding the button displays 1 color on an attached RGB LED and quickly double tapping the same button changes it to another fixed color. There's no way (on board) to cycle through the various color values, it's just a hard change between different values.
I'm trying to build my own circuit that does the same thing, but I'm not sure what that IC is below the push button. There's no text on it or even an image, so I can't look up the data sheet. Searching the silkscreened "TLBZ-039-V2.0" also yielded no results. My first thought was that it was a generic 555 chip because all it has to do is change the voltage going to the different pads, but all the datasheets I've found for a 555 chip show pin 1 is GND and on this board, it has pin 1 being VCC.
Without taking the IC off the board it also looks like pins 2 and 3 just aren't used, or they disappear somewhere beneath the chip. I can post more pictures of the bare board with the traces once I get the button/IC off.
Best Answer
A 555 can't simply do what that chip does, so it's not a 555.
It is most likely a cheap microcontroller that runs a button-reading LED-blinking program to make it work. Or a specific chip made for these kind of products, but a microcontroller allows to just use one chip for all kinds of different products.