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NOTE: A power sequence for the C5545 USB peripheral is only required in designs when the USB
interface is used. During the power sequence, the internal USB LDO is turned on to supply
1.3 V to the USB core. After the USB LDO is turned on, it is used to enable a load switch
that supplies 3.3 V for the USB PHY. Once the 3.3 V supply for the USB PHY is enabled,
another load switch links 5 V USB to the C5545 VBUS input. On 1.8 V designs, which do not
use the USB peripheral, the 3.3 V DC-DC and two load switches can be eliminated. For
more information, see the TMS320C5545 Fixed-Point Digital Signal Processor Data Sheet
(SPRS853).
SPRUI90 – September 2016
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System Power Requirements
TMS320C5545 BoosterPack Hardware
41
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