UMTS/HSPA(+) Module Series
UC200T-EM Hardware Design
UC200T-EM_Hardware_Design 34 / 68
MCU/ARM
TXD
RXD
VDD_EXT
10K
VCC_MCU
4.7K
10K
VDD_EXT
TXD
RXD
RTS
CTS
DTR
RI
RTS
CTS
GND
GPIO
DCD
Module
GPIO
EINT
VDD_EXT
4.7K
GND
1nF
1nF
Figure 14: Reference Circuit with Transistor Circuit
1. Transistor circuit solution is not suitable for applications with high baud rates exceeding 460Kbps.
2.
“*” means under development.
3.11.
SD Card Interface*
The following table shows UC200T-EM pin definition of SD card interface.
Table 14: Pin Definition of SD Card Interface
Pin Name
Pin No. I/O
Description
Comment
SDC2_DATA3*
28
IO
SD card SDIO bus DATA3
1.8V/2.8V power domain.
If unused, keep it open.
SDC2_DATA2*
29
IO
SD card SDIO bus DATA2
1.8V/2.8V power domain.
If unused, keep it open.
SDC2_DATA1*
30
IO
SD card SDIO bus DATA1
1.8V/2.8V power domain.
If unused, keep it open.
SDC2_DATA0*
31
IO
SD card SDIO bus DATA0
1.8V/2.8V power domain.
If unused, keep it open.
SDC2_CLK*
32
DO
SD card SDIO bus clock
1.8V/2.8V power domain.
If unused, keep it open.
SDC2_CMD*
33
IO
SD card SDIO bus command
1.8V/2.8V power domain.
NOTES