Datasheet

SLDU010
TI CONFIDENTIAL – NDA Restrictions
Page 35 of 50
Figure 27. OWI GUI Tab
7.6.1 Activate OWI with Over-Voltage Drive
The “Activate OWI with Over-Voltage Drive” button on the GUI initializes the OWI activation
circuit by controlling the signal that drives the “Q4” BJT. Pressing the button will disable the
PGA400-Q1 Output MUX, activate the +7.5V pull-up, wait roughly 200ms, then release the OWI
pull-up. The 8051 must be running have code loaded into it that will send the signals to activate
the OWI transceiver.
7.6.2 Activate OWI with ESFRs
The “Activate OWI with ESFRs” button will activate the OWI transceiver by directly writing to
ESFR 0xD4. After this button is pressed, the PGA400-Q1 will be in “OWI” mode and SPI
commands will no longer work.
7.6.3 Activate TI-GER UART
The “Activate TI-GER UART” button will initialize the UART hardware module in the TI-GER in
preparation for OWI communication.