MicroSD Connector Pinout Details
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Here are the pin descriptions for J2 (TF-015 MicroSD/TF Card Connector):
Table
| Pin No. | Pin Name | Type | Function | I/O Characteristics | Special Considerations |
|---|---|---|---|---|---|
| 1 | DAT2 | I/O/PP | Data Line [Bit 2] | I/O, push-pull | Ensure correct signal level matching. |
| 2 | CD/DAT3 | I/O/PP | Card Detect / Data Line [Bit 3] | I/O, push-pull | Also used for card-detection in some systems. Pull-up may be needed. |
| 3 | CMD | PP | Command/Response | Push-pull | Specialized command channel. Use as per SDIO protocols. |
| 4 | VDD | S | Supply Voltage | Supply | Typically 2.7–3.6 V for MicroSD. |
| 5 | CLX | I | Clock | Input | Keep traces short and well-matched for signal integrity. |
| 6 | VSS | S | Supply Voltage Ground | Supply | Connect to system ground. |
| 7 | DAT0 | I/O/PP | Data Line [Bit 0] | I/O, push-pull | Main data channel. |
| 8 | DAT1 | I/O/PP | Data Line [Bit 1] | I/O, push-pull | Used for 4-bit mode. |
Legend:
- I/O/PP = Input/Output, Push-Pull
- PP = Push-Pull
- S = Supply
- I = Input
General Notes:
- All I/O pins are typically 3.3V logic (unless using lower-voltage cards—check card specs).
- CMD and CLK (CLX) lines should be routed carefully to prevent noise and maintain SD specification requirements.
- Some designs use DAT3/CD for card detect; otherwise, tie high with a pull-up if not used for detection.
- Pull-up resistors (10-50kΩ) are recommended on DAT[3:0], CMD for standard operation.
- Refer to the SD/MMC protocol requirements for proper card initialization and communication.
For more, see the full TF-015 MicroSD connector datasheet (PDF).
Find pull-ups
Route SD interface
Add decoupling cap
Card-detect resistor
Symbol for detect switch
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