User's Manual Part 1

MC75 Hardware Interface Description
Strictly confidential / Draft
s
MC75_V00.190a Page 48 of 91 15.02.2005
SD_CLK
SD_CMD
SD_WP
SD_D0
SD_D1
SD_D2
SD_D3
VEXT
8
7
6
5
4
3
2
1
9
DAT1
DAT0
GND
CLK
VDD
GND
CMD
CD/DAT3
DAT2
lock
unlock
Write
protect
slide
Card
detect
SD card holder
SD card
50k
1)
1) Internal switch is closed after power-up and
open during regular data transfer. Used for
card detection.
SD_DET
47k
GSM module
80 pole board-to-board connector
Baseband
controller
Analog
controller
Figure 17: SD card interface (example with power supply from module’s VEXT line)