NXP Semiconductors FRDM-MCXN947 - SD Card Interface

NXP Semiconductors
UM12018
FRDM-MCXN947 Board User Manual
2.7 SD card interface
The target MCU (MCX N94X) features one micro secure digital host controller (uSDHC) module.
On the FRDM-MCXN947 board, the uSDHC controller connects to the SD card connector (J12) (not populated
by default).
• The SD card detect pin is an open switch that shorts with GND when the card is inserted.
• The SD card VDD (P3V3_SDHC) is supplied by the P3V3 rail through a zero-ohm resistor R202.
• All SD card bus pins connect to Port P2_[7:1] pins. Therefore, the Port P2 voltage must be set according to
the type of card being used.
Figure 12 shows the SD card connections.
Figure 12. Micro SD card connector circuit
The Port P2_[7:2] lines that are used for the SDHC card slot are also shared with the PWM signals on the
Arduino compatible headers (J1, J2, and J3). The Port P2_[2] line is shared with the camera connector and
PWM signals on the Arduino compatible headers (J2 and J3). The zero-ohm onboard resistor (R168) is used
to allow the selection of signals between the SDHC card slot or the camera connector. The Arduino-compatible
header sockets are connected by default.
Figure 13 shows the zero-ohm resistors connection for uSDHC signals selection.
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User manual Rev. 1 — 20 January 2024
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