AN4541 datasheet(18/21 Pages) STMICROELECTRONICS

부품명	AN4541

상세설명	high-speed SD card protection and filtering devices

PDF	21 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

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18 / 21 page

Card detection

AN4541

18/21

DocID026513 Rev 1

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).

AN4541 데이터시트(PDF) 18 Page - STMicroelectronics