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AN4541 датащи(PDF) 18 Page - STMicroelectronics |
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AN4541 датащи(HTML) 18 Page - STMicroelectronics |
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18 / 21 page ![]() Card detection AN4541 18/21 DocID026513 Rev 1 6 Card detection Mechanical or electrical card detection can be implemented. The EMIF06-MSD03F3 device can be chosen for applications requiring electrical card detection. This filter has the same electrical characteristics as the EMIF06-MSD04F3, but the CD/Dat3 pin is disconnected from the VDD host side (Figure 5). After the power-up, this pin is connected to VDD through the internal 50 kΩ pull-up resistor of the SD card; the host can drive a pull-down resistor (typically 470 kΩ) connected to this pin and detect the logic level change, specifically, card insertion. After this sequence, the internal 50 kΩ resistor must be disconnected by the SET_CLR_CARD_DETECT command (ACMD42). |
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