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When the user disables the target, another prompt will provide notification to enable the target again
as shown in Figure 22. When the unit is enabled, the output voltage will remain low as if the PI33xx‑xx
was still disabled. This is normal. The Buck GUI will next write “01h” into the SYN[3:0] register.
The next step prompts the user to disable the target again. After clicking “OK”, Buck GUI will reset
from test mode 5 and then clear the other user registers as shown in Figure 23. Buck GUI will display a
dialog box to inform the user of the successful burn completion. When the user enables the PI33xx‑xx, it
should power up normally and the burned in changes shall take effect.
The user may read the register that was just programmed by clicking on the “SYNC” button. Buck GUI
should show the new burned in values read back from the SYN[3:0] register as shown in Figure 24. If
an error message occurs or the incorrect results are obtained, refer to the section titled “PI33xx‑xx Error
Messages” for more information.
It is important to note that the data sent here is the value shown in the dialog window. The actual
read is the burned in value of the register. Sending “4Ch 21h FFh” or “4Ch 21h 00h” would
also work properly.
Figure 22
SYNC “0001” burn phase 2
unit must be enabled
Figure 23
SYNC “0001” burn phase 3
unit must be disabled
Figure 24
Read SYN[3:0]
after burning “0001”
Summary of Contents for PI33 EVAL1 Series
Page 13: ...UG 309 Page 13 Figure 14 PI33xx xx SYNC 1000 timing Figure 15 PI33xx xx SYNC 1111 1 4MP ...
Page 14: ...UG 309 Page 14 Figure 16 PI33xx xx SYNC 1110 1 3MP Figure 17 PI33xx xx SYNC 1101 1 2MP ...
Page 15: ...UG 309 Page 15 Figure 18 PI33xx xx SYNC 1100 2 3MP Figure 19 PI33xx xx SYNC 1001 3 4MP ...
