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I work on student project - UICC terminal on DE1. Simple sim cards have several operation mode - class c (1.8v) and class b (3.3), but specification says that 3.3V is maximum, so I think I must lower voltage to, say, 3.2V for better compatibility with 3.3V sim cards. It would be easier, than implement level translator for class c operation mode.
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There are dual-power-rail level translators from Texas Instruments and others. On one side you power it at 3.3V from the DE1 expansion header, and interface at 3.3V, and then on the other side, you power it from 1.8V or 3.2V for interfacing to the sim card. You're going to need a socket anyway, so you may as well put the buffer in there too. You might even find a sim card PCB assembly with the connector and the level translators. Take a look on the web and see if you can find something.
Cheers,
Dave
Honored Contributor
