Datasheet

SLDU010
TI CONFIDENTIAL – NDA Restrictions
Page 19 of 50
Figure 14. SPI/I2C Communication MUX
5.2 I2C
I2C is the second most common protocol for communicating with the PGA400-Q1 device. The
I2C communication method must be selected in the PGA400-Q1 by sending the appropriate SPI
commands before the communication will work. If the GUI is used to change from SPI to I2C
mode, the GUI will configure the SPI/I2C MUX to send the I2C signals to the PGA400-Q1. I2C
is also used as the main communication method for the DAC and ADC peripherals on the EVM.
To avoid any conflicts between I2C signals meant for the PGA400-Q1 and I2C signals meant for
the EVM peripherals, there is a second MUX installed that splits the I2C signals between the
PGA400-Q1 and the rest of the EVM. The circuit of this MUX is shown below.