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Figure 21. Level Shifter Direction for I2S and UART Interfaces
NOTE: Due to different IO voltage between the LaunchPad (3.3 V) and C5545 BoosterPack (1.8 V),
level shifters are present at the LaunchPad headers. These level shifters require a VCC
supply from the LaunchPad to operate. When no LaunchPad is attached, or VCC is not
supplied, the level shifted signals have no voltage reference and are not available at the
headers. To work-around this issue (whenever no LaunchPad is connected), VCC3V3 can
be wired from TP3 on the C5545 BoosterPack to J7 pin 1 (LaunchPad J1 pin 1).
SPRUI90 – September 2016
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Introduction to C5545 BoosterPack Board
TMS320C5545 BoosterPack Hardware
23
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