2 Sharing the Control Bus

The PCM6xx0 devices are controlled through an I²C bus operating in standard mode, fast mode, and fast mode plus. This I²C control bus requires a 7-bit slave address whose two least significant bits are programmable by pulling the ADDR0_SCLK and ADDR1_MISO pins to VSS or IOVDD. By programming different I²C slave addresses through these pins, several PCM6xx0 devices can share a single I²C control bus. Moreover, a programmable broadcast enable feature allows you to temporarily change the I²C slave address to 1001000 for PCM6xx0. This temporary slave address allows for simultaneous broadcasting I²C communication to all PCM6xx0 devices in the system. Table 1 lists the four possible PCM6xx0 device addresses resulting from these pin and broadcast configuration options. In these table entries for ADDR1_MISO and ADDR0_SCLK, the notation '0' refers to pulling the pin to VSS, while notation '1' refers to pulling the pin to IOVDD. The notation 'X' refers to pulling the pin to either VSS or IOVDD.