TM1637 data transfer carries with answering signal ACK. For a right data transfer, an answering signal ACK is generated inside the chip to lower the DIO pin at the failing edge of the eighth clock.

If you’re dealing with RF, you’ll probably have the need to generate a variety of clock signals. Fortunately, [Jason] has applied his knowledge to build a SI5351 library for the Arduino and a ...

Instead, it transpired that this TM1637 module had huge (10nF) capacitors between 0V and the incoming clock and data, causing super-sluggish signal rise times (~100μs). Credit for this discovery goes ...