Expander

ESP32 Open IoT and IIoT Gateways (P01 & P02) 

 

 The female goldpin connector allows easy access to different signals. It might be useful during analysis of the board.  

 

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

 3V3 - 3.3 V voltage 

 I2C_SCL and I2C_SDA - main lines of the 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 the 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)