Female goldpin connector allows easy access to different signals. Might me useful during analysis of the board.

  • GPI38 - general purpose input pin, connected directly to the MCU (might work only as an input pin)

  • 3V3 - 3,3V voltage

  • I2C_SCL and I2C_SDA - main lines of I2C interface

  • GND - ground

  • NC - not connected

  • FGC - frame ground connection

  • BUT_EXT - switch test line ('1' is set by default)

  • Q2 - Q2 pin of shift register

  • STCP - storage register clock input

  • SHCP - shift register clock input

  • Q7S - Serial data output pin of shift register

  • CHIP_PU - Chip power up signal ('1' - enables the chip)