iMX RT1062 OEM Developer’s Kit - User’s Guide
Page 27
Copyright 2019 © Embedded Artists AB
4.10
SP9: SDIO Bus and SD Memory Card Interface
There is a SD memory card interface with SD card connector J15. The associated power switch is
controlled by GPIO_AD_B0_05. By default this signal is active high (high = power to SD card) but can
optionally be changed to active low SJ3 in 2-3 position. Additionally, signal POR_B will power cycle the
SD memory card. There is visual indication via LED9 that the memory card is powered.
Note that the SD memory card connector, J15, and the M.2 connector; J38, both are
connected to the SDIO bus.
Only one interface at a time can be used.
It is possible to disconnect the SD memory card connector, J15, from the SDIO bus by
removing isolation resistors R86-R91. This is typically not needed except when running the
M.2 interface at very high SDIO bus frequencies. R86-R91 are found on the bottom side
under the LCD. Due to their location they are not easy to remove.
The SDIO bus interface I/O voltage can be either 3.3V or 1.8V. Jumper J16 controls this:
J16, pos 1-2 shorted (
default
)
SDIO bus interface I/O voltage is controlled by GPIO_B1_14 (high = 1.8V and low = 3.3V),
but is forced to 1.8V if an M.2 Module is inserted in J38.
J16, pos 2-3 shorted
SDIO bus interface I/O voltage is forced to 1.8V.
J16, open
SDIO bus interface I/O voltage is forced to 3.3V.
Figure 22 – SD Memory Card Interface
SD Connector
J15
Power LED
LED9
SD_VSEL Ctrl
J16
1-2 (lower pos):
Controlled by GPIO_B1_14 but forced to
1.8V VDDIO for SDIO when M.2 module inserted (default)
2-3 (upper pos):
Forced 1.8V VDDIO for SDIO
Open:
Forced 3.3V VDDIO for SDIO
SDIO Bus Isolation Resistors
R86-R91 on bottom side
SDIO Bus Isolation Resistors
R150-R152 on bottom side
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