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Kevin wrote:
> Hi,
> 
> I use a home grown proto board (5V) with a PIC16F88 
> w/bootloader and a Max232 chip to load programs via the pc serial port.
> 
> I would like to communicate to a TI CC1101 chip via SPI. The 
> TI CC1101 radio chip has voltage range of 1.8V to 3.6V. Does 
> anybody have a simple level conversion circuit or a favorite 
> chip they use to convert the 5V to 3V and vice versus ?
> 
> 
> Thanks, 
> Kevin

The circuit in
http://www.nxp.com/acrobat_download/applicationnotes/AN97055.pdf
is what I normally use to convert between two voltage levels.

Many people will tell you that you can use a voltage divider for 5v -> 3v
and rely on the 5v logic's 2.5v threshold for 3v -> 5v conversion. This
may work but it is not bidirectional and sounds a bit iffy.

- --
Brendan Gillatt | GPG Key: 0xBF6A0D94
brendan {a} brendangillatt (dot) co (dot) uk
http://www.brendangillatt.co.uk
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