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Comp.Arch.FPGA | SIM card 1.8V / 3V sensing
There are 3 messages in this thread.
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SIM card 1.8V / 3V sensing - Mike Perkins - 2011-09-19 13:14:00
Can anyone steer me in the right direction of an article how one is meant to determine if a SIM card is of the 1.8V, or the 3V variety? Many thanks in advance. -- Mike Perkins Video Solutions Ltd www.videosolutions.ltd.uk______________________________
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Re: SIM card 1.8V / 3V sensing - Brian Drummond - 2011-09-20 05:26:00
On Mon, 19 Sep 2011 18:14:22 +0100, Mike Perkins wrote: > Can anyone steer me in the right direction of an article how one is > meant to determine if a SIM card is of the 1.8V, or the 3V variety? > > Many thanks in advance. A few minutes search found this datasheet... http://www.ti.com/lit/ds/symlink/txs02326.pdf which says... "Configure the SIM1 regulator to 1.8V" ... "If there is lack of communication ... the SIM1 interface must be powered- down and then ... configuring it to 2.95V" I suppose it works. - Brian
Re: SIM card 1.8V / 3V sensing - Mike Perkins - 2011-09-20 05:32:00
On 20/09/2011 10:26, Brian Drummond wrote: > On Mon, 19 Sep 2011 18:14:22 +0100, Mike Perkins wrote: > >> Can anyone steer me in the right direction of an article how one is >> meant to determine if a SIM card is of the 1.8V, or the 3V variety? >> >> Many thanks in advance. > > A few minutes search found this datasheet... > http://www.ti.com/lit/ds/symlink/txs02326.pdf > which says... > > "Configure the SIM1 regulator to 1.8V" ... > "If there is lack of communication ... the SIM1 interface must be powered- > down and then ... configuring it to 2.95V" > > I suppose it works. > > - Brian > Many thanks. I had already spend far more than a few minutes searching and believed there might have been a more subtle way of finding out, rather than a "does it work at 1.8V, and if not, let's try at 3V"!! -- Mike Perkins Video Solutions Ltd www.videosolutions.ltd.uk