Since I 2C is an open-drain/open-collector communication, appropriate pullup resistors are crucial to pull the communication lines HIGH when they are not driven LOW by the open-drain interface ( ). The clock line is used to synchronize data transfer to and from the device between the microcontroller and the EEPROM chip whereas the data line is used to transfer data bidirectionally between the microcontroller and the EEPROM chip. ![]() Likewise, the SCL pin is the serial clock line and the SDA pin is the serial data line. The first jumper (J1) is for write protection (WP) which can enable or disable the microcontroller writing data to the EEPROM chip, while the next three jumpers (J2-J3-J4) are address input pins (A0-A1-A2) for multiple device operation. Note that when a jumper is placed over the jumper pins, an electrical connection is made between them to activate certain settings accordingly ( (computing).
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