SIM5218E Hardware Design
Table 15
: USIM interface
Pin
SIM5218E_ Hardware Design_V1.06
2012.09.21
37
Table 16: Signal of USIM interface (board-to-board connector)
Following is the reference circuit about USIM interface. We recommend to use an Electro-Static
discharge device ST (
) SMF05C
for “ESD ANTI”. If user remove ESD components, please replace them with 33pF and 10pF
capacitors, it’s good for EMI performance. Note that the USIM peripheral circuit close to the
USIM card socket.
User can select the 6 pins USIM card. The reference circuit about 6 pins USIM card illustrates as
in the following figure..
Figure 20: USIM interface reference circuit with 6 pins USIM card
*Note:
USIM_DATA has been pulled up with a 22kR resistor to V_USIM in module. So
please do not pull up or pull down in user’s application circuit. As shown in above figure,
SMF05C is used for ESD protection for SIM interface. And 220nF capacitor on V_USIM is
used to reduce interference
.
Signal
Description
57
V_USIM
USIM Card Power output depends automatically on USIM mode
，
one is 3.0V±10%, another is 1.8V±10%. Current is about 10mA.
56
USIM_DATA
USIM Card data I/O, which has been pulled up with a 22kR
resistor to V_USIM in module. So please don’t pull up or pull
down in userr application circuit.
12
USIM_CLK
USIM Card Clock
13
USIM_RESET
USIM Card Reset
Содержание SimCom SIM5218E
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