SIM card 1.8V / 3V sensing

[Mike Perkins]

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

 

[Mike Perkins]

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

 

[Brian Drummond]

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