Usim Card Interface; Usim Card Application - SimCom SIM5218E Hardware Design

SIM5218E Hardware Design

3.9 USIM card interface

3.9.1 USIM card application

You can use AT Command to get information in USIM card. For more information, please refer to
document [1].
The universal subscriber identification module (USIM) is a smart card for UMTS/GSM cellular
applications. The USIM provides the required subscription information to allow the mobile
equipment to attach to a GSM or UMTS network. The USIM also provides the subscriber's
verification procedures as well as authentication methods for network authentication during the
attach procedures. The USIM card can be inserted into any UMTS/GSM USIM equipped handset,
allowing the user to receive or make calls, and receive other subscribed services from any USIM
equipped handset, thus enabling more handset independence for the user.
Both 1.8V and 3.0V SIM Cards are supported.
The SIM interface is powered from an internal regulator in the module having nominal voltage
2.8V. All pins reset as outputs driving low. Logic levels are as described in below table.
Table 17 : USIM interface
Pin Signal
57 V_USIM
56 USIM_DATA
12 USIM_CLK
13 USIM_RESET
Table 18: Signal of USIM interface (board‐to‐board connector)
Following is the reference circuit about USIM interface. We recommend an Electro-Static
discharge device ST ( www.st.com ) ESDA6V1W5 or ON SEMI ( www.onsemi.com ) SMF05C
for "ESD ANTI". If you 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.
You can select the 6 pins USIM card. The reference circuit about 6 pins USIM card illustrates as
following figure.
SIM5218E_HD_V1.03
Description
USIM Card Power output automatic output on USIM mode，one is
3.0V±10%, another is 1.8V±10%. Current is about 10mA.
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 your application circuit.
USIM Card Clock
USIM Card Reset
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11.06.2009