Figure 2-10. External PSRAM Board (Top View)
Figure 2-11. External PSRAM Board (Bottom View)
The xSPI signals from the CC35xxE are part of the VDDSF IO ring, and this voltage can be defined as
either 1.8V or 3.3V, depending on the external flash or PSRAM used. The default voltage of VDDSF on the
LP-EM-CC35X1 is 1.8V. This voltage provides the reference voltage for the xSPI lines from the CC35xxE and
supply voltage to the external flash and PSRAM.
If users want to use a flash or PSRAM which interfaces at 3.3V instead, then R42 can be assembled on the
right two solder pads instead of the left (left pads = 1.8V, right pads = 3.3V). The R42 is on the left solder pads,
therefore, the VDDSF voltage is 1.8V, as shown in Figure 2-10.
www.ti.com Hardware
SWRU629 – SEPTEMBER 2024
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