Datasheet

PGA400 EVM User Guide
TI CONFIDENTIAL – NDA Restrictions
Page 18 of 50
Figure 13. OWI Transceiver
5 PGA400-Q1 Communication Interfaces
The PGA400-Q1 has several communication options including: SPI, I2C, OWI, and UART. All
of these communication interfaces and related circuitry are present on the PGA400-Q1 EVM.
5.1 SPI
SPI is the main communication method on the PGA400-Q1 and must be used to initially select
one of the other communication methods (with the exception of the OWI activation pulse). Since
the SPI and I2C pins are shared on the TI-GER communication board, a communication MUX is
used to differentiate between the SPI and I2C functions on the EVM. By default the EVM
powers up with the SPI communication interface selected and the user must change the setting
on the communication MUX to change to I2C. The SPI signals can be monitored on the “H1”
header on the EVM. Shown below is the SPI/I2C communication MUX.