NXP Semiconductors MCX-N9 EVK Series - SD Card Interface

NXP Semiconductors
UM12036
MCX-N9XX-EVK Board User Manual
VBUS control
Figure 14. FS USB circuit diagram
HS USB interface
On the MCX-N9XX-EVK board, the USB1_DM and USB1_DP signals from the MCX N94X MCU connect to the
onboard USB connector (J27) directly through a common mode choke. The common mode choke is included
for noise suppression on the DM / DP signals, however, pads are included to install bypass resistors for testing
choke-less configurations.
Figure 15 shows the HS USB circuit diagram.
VBUS control
Figure 15. USB HS circuit diagram
2.4 SD card interface
The target MCU (MCX N94X) features one micro secure digital host controller (uSDHC) module.
On the MCX-N9XX-EVK board, the uSDHC controller connects to the SD card connector (J25).
• The SD card detect pin is an open switch that shorts with GND when the card is inserted.
• The SD card VDD (VDD_SD) is supplied by the P3V3 rail and is controlled by the protected power switch
(U56). The Port P0 pin 11 is used to control the ON/OFF of the U56 power switch depending upon the 3-pin
jumper (JP17) configuration. For the JP17 Jumper details, see Section 1.6.
• The SD card bus pins are Port P2_[7:1] pins. Therefore, the Port P2 voltage must be set according to the type
of card being used.
Figure 16 shows the SD card connections.
UM12036 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved.
User manual Rev. 1 — 20 January 2024
23 / 51