EMIF06-MSD02N16 데이터 시트보기 (PDF) - STMicroelectronics
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EMIF06-MSD02N16 Datasheet PDF : 14 Pages
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EMIF06-MSD02N16
Application information
2
Application information
The EMIF06-mSD02N16 is a dedicated interface device for micro SD card/T-Flash card in mobile phones. The
device provides:
• ESD protection
• EMI filterering
• Pull-up resistors
• Card detection circuit
2.1
ESD protection
Each pin is connected to a TVS diode able to withstand 12 kV on all pins except on DATx_In, CMD_In and
CLK_In.
2.2
EMI filtering
DATx, CMD and CLK lines are immunized against EMI radiations thanks to pi-filters. To avoid any degradation of
the signal integrity at high frequency, the total line capacitance stays lower than 20 pF making the device
compatible with a clock frequency up to 52 MHz.
2.3
Pull-up resistors
As recommended by the SD Specifications (Part 1 Physical Layer Version 2.00), all the data lines DATx and the
CMD line must be pulled-up with resistors of 10 to 100 kΩ to avoid bus floating not only in SD 4-bit mode but also
in SD 1-bit and SPI mode.
For the EMIF06-MSD02N16 device the pull-up resistor value has been fixed at 90 kΩ. This value makes the
EMIF06-MSD02N16 compatible with most of the level shifters that may be used in the circuit including auto
direction-sensing translators known to exhibit a weak current output.
2.4
Card detection circuit
The EMIF06-mSD02N16 provides the flexibility to use either mechanical card detection with a dedicated pin
connected to the memory card slot or the electrical card detection using the internal pull resistor of DAT3 of the
micro SD card/T-Flash card.
In case of mechanical card detection, the user must add a pull-up on the circuit connected to the CD (Card
Detect) of the micro-SD/T-Flash slot as shown in Figure 8.
Figure 8. Mechanical card detection
Host
controller
VDD
rPeuslils-utopr
GND
WP/CD
GND
Contact when
insertingthe card
SD card
A pull-up of 90 kΩ is embedded into the EMIF06-MSD02N16. The routing corresponding to the mechanical card
detection configuration is shown in Figure 9.
DS5979 - Rev 2
page 5/14
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