The Inter-Integrated-Circuit protocol, more commonly known as I²C, was designed around daisy-chaining. With I²C, multiple “slave” devices can communicate with one or more “master” devices. The protocol uses two communication pins: a serial data line (SDA) which is shared by both the “master” and “slave” devices and a serial clock line (SCK) which the master controls. The I²C standard requires four signals, serial data (SDA), serial clock (SCK), ground (GND) and power (VCC).
Prior to 2018, our I²C Pmods were designed with a 2X4 male pin header for daisy chaining. As of Digilent Pmod Interface Specification 1.1.0, I²C Pmods are now designed with a 6-pin male header on one end and a 6-pin female header opposite. This allows for daisy chaining, through the use of an onboard jumper, and improves the mechanical compatibility within the Pmod ecosystem.
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