I have used the voltage divider option in the past to make a 5V pic talk to=
 an Analog Devices DSP running at 3.3V.  We thought it might be iffy as wel=
l but found it worked well and avoided us needing to add another chip.  Hav=
ing said that I tried to do the same with a Xilinx fpga and found it wouldn=
't work so it's not a perfect solution.

If you want to be certain and use a level converter start with your usual s=
upplier (Digikey, Farnell, Newark, etc.) and see what they offer.  They can=
 be a great place to find what's available for different functions.

Regards,
Andy

> Date: Mon, 28 Sep 2009 21:39:15 -0400
> From: kben@dca.net
> To: piclist@mit.edu
> Subject: [PIC] PIC SPI level conversion
> =

> =

> 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
> -- =

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> http://mailman.mit.edu/mailman/listinfo/piclist
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