Table 7. Digital audio amplifier port connections (continued)
Circuit reference Port
I2S BLCK P0_7
I2S DAI P0_9
I2S DAO P0_23
I2S WS P0_8
7.3 SD/eMMC card slot
The SD card (J32) included in the MIMXRT685-EVK board provides a 4-bit SDIO interface to support memory cards, plug-in WiFi
modules, etc. Power enable to the socket is provided via P2_4.
Software drivers and related examples for the SD card are provided as part of the MCUXpresso SDK.
Table 8. Micro SD card connections
SDIO interface signals Circuit reference Port Notes
SDIO Clock SD_CLK P1_30 ICON function 2
SDIO Command SD_CMD P1_31 ICON function 2
D0 SD_DAT0 P2_0 ICON function 2
D1 SD_DAT1 P2_1 ICON function 2
D2 SD_DAT2 P2_2 ICON function 2
D3 SD_DAT3 P2_3 ICON function 2
Card detect SD_CD P2_9 ICON function 2
Power enable SD_WR_PRT P2_4 ICON function 2
For further details, please refer to the boards schematics and SD/MMC chapter on the User Manual.
7.4 Accelerometer
The board includes an NXP FXOS8700CQ accelerometer, interfaced to port 0 (P0_17 and P0_18) with its interrupt output
connected to P1_5 (JP30 has to be populated). The accelerometer has an I
2
C address of 0b00011110 (0x1E). See schematic for
further information. JP15 must be installed to provide voltage supply to the accelerometer.
I
2
C software drivers are provided as part of the MCUXpresso SDK, and example code is provided to illustrate how to read values
from the accelerometer.
7.5 User LEDS
Three user LEDs are provided on the board. The LEDs in this device are controlled by MIMXRT685 ports P0_26 (Blue), P0_31
(Red), P0_14 (Green) with the LEDs being illuminated when the respective led is pulled low.
7.6 Buttons
Four buttons are provided on the MIMXRT685-EVK, as described in this section.
7.6.1 User buttons (SW1 and SW2)
SW1 (P1_1) and SW2 (P0_10) buttons are intended for user application use. These buttons pull ports low when the button is
pressed. 100 kΩ resistors are used to pull these two ports to VDDIO1 when the buttons are not pressed.
NXP Semiconductors
On-board peripherals
i.MX RT685 Evaluation Board, Rev. 0, March 20 2020
User's Guide 23 / 31
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