Functional description
FRDM-K32L3A6 Freedom Development Board, User’s Guide, Rev. B0, 09/2019
NXP Semiconductors
9
3.4 Secure Digital Host Controller (SDHC)
A micro secure digital (SD) card slot is supported on the FRDM-K32L3A6. The SD card detect pin is an
open switch that shorts with VDD when the card is inserted. The SD card VDD is supplied by VDDI01
and it must be configured to be at least 2.7V. The SD card connections are shown in
Figure 7
.
Figure 7. Micro SD card connector circuit
The SDHC interface lines are directly connected to the SDHC connector with the exception of four
SDHC lines. These lines are multiplexed with the FlexIO connector via zero ohm resistors. These
multiplexed connections are shown in the following figure.
Figure 8. Micro SD card connector circuit
3.5 Serial flash memory
Component U15 is the MX25R3235FZNIL0 32-Mbit (4 MB) serial flash memory with SPI interface. It
is intended for storing the non-volatile system data, or parameters.
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