| History
|
| Issue Date
|
Notes
|
| 2026/03/27
|
First documentation release
|
J21 is a microSD memory card connector. It is connected to the ONDA SOM through a bidirectional 1.8V/3.3V voltage-level translator mounted on the ONDA Evaluation Kit. Level shifter is required because MIO signals are 1.8V. The following table reports the pinout of the connector:
| Pin#
|
Pin name
|
Function
|
Notes
|
| 1 |
PS_SD0_DAT2 |
- |
-
|
| 2 |
PS_SD0_DAT3 |
- |
-
|
| 3 |
PS_SD0_CMD |
- |
-
|
| 4 |
3.3V |
- |
-
|
| 5 |
PS_SD0_CLK |
- |
-
|
| 6, 9, 10, 11, 12 |
DGND |
- |
-
|
| 7 |
PS_SD0_DAT0 |
- |
-
|
| 8 |
PS_SD0_DAT1 |
- |
-
|
| 3.3V |
- |
|
Pull up to 3V3 with 10K Ohm
|
ONDA Evaluation Kit micro SD card slot
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