Smart Machine Smart Decision
SIM521x EVB User Guide
11.04.2011
11
4.3 SIM card interface
Figure 5: SIM card socket
Table 5: SIM card socket
Pin
Signal
Input/Output
Description
1
V_USIM
O
USIM Card Power output automatic
output on USIM mode
，
one is
3.0V±10%, another is 1.8V±10%.
Current is about 10mA.
2
USIM_RESET
O
USIM Card Reset
3
USIM_CLK
O
USIM Card Clock
4 GND
Ground
5 SIM_VPP O
V_USIM
6
USIM_DATA
I/O
USIM Card data I/O
