...........continued
Function
Pin
PIO
Signal Description
3.3V SD Card supply
4
–
VDD_SDCARD (3.3V)
SD Card clock line
5
PB30
SDMMC1_CK_PB30
Ground
6
–
Ground
SD Card data line 0
7
PB31
SDMMC1_DAT0_PB31
SD Card data line 1
8
PC0
SDMMC1_DAT1_PC0
SD Card data line 1
9
PC1
SDMMC1_DAT2_PC1
SD Card card detect
10
PC4
SDMMC1_CD_PC4
SD Card write protect
11
PC3
SDMMC1_WP_PC3
Ground
12
–
Ground
SDMMC data and control lines can be 3.3V or 1.8V, depending on the SD Card speed. A power voltage selector is
implemented and controlled by pin PC5 of the MPU. The voltage selected by default is 3.3V.
Figure 3-49. SD Card Power Selector Schematic
IN
1
VDD
2
GND 3
S1
4
D 5
S2
6
ADG849
U8
4.7uF
10V
0402
C130
GND
0.1uF
10V
0402
C131
GND
VDD_3V3
VDD_3V3
VLDO1
GND
10k
0402
1%
R120
SDMMC1_1V8SEL_PC5
VDDSDMMC1
10k
0402
1%
R118
VDD_3V3
0R
0603
R117
4.7uF
10V
0402
C128
4.7uF
10V
0402
C127
GND
GND
IN=0: S1 Closed
IN=1: S2 Closed
The user can perform a hard reset of the SD Card by forcing the PB28 PIO of the SAMA7G5 device or by using the
processor reset line (R262 must be populated) "NRST_OUT" signal.
This action disables the MIC94085YFT power switch and VDD_SDCARD is forced to ground. For more details about
the MIC94085YFT power switch, refer to the product
.
SAMA7G54-EK
Function Blocks
©
2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003273A-page 57
