> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Keith Howell
> Sent: Monday, March 30, 1998 3:31 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: I2C Emulation and control
>
>
> Norman Gillaspie wrote:
> >
> > I need to have a pic emulate and communicate with an I2C bus.
> > The PIC would then talk to two RF Synthesizer chips and an 8
> bit DAC.<snip>
> I'm not too clear about your app.
>
> I interpret that you want your PIC to run an application,
> and to control the other devices via I2Cbus and a three-wire bus
> (presumably SPI).


I need to talk to the PIC with an I2C bus and set the frequencies
on the synthesizers. The synthesizers have a three wire bus.

I do not have choice on the synthesizers. I am using synthesizer now
that uses an I2C bus. I wish to go to an improved part that does not have
I2C.


I also wish to store the frequncy setting in eeprom.


I already have all of the RF and PLL design done. I was wondering if
anyone has has experience emulating an I2C bus with the 16f84 for instance?

Norman

>
> This does not sound too difficult.
> You can use the I2Cbus to control serial EEPROMs like the 24C02,
> DACs, ADCs, parallel I/O, etc.
>
> If you make it all-I2C you can avoid writing SPI code, and vice versa.
>
> What kind of RF synth chips have you got, and what for?
>
> Philips make digitally-programmable PLLs, which they use in their
> TV tuner modules. These go through VHF/UHF/Cable/Satellite bands.
> Circuit design at these frequencies is a bit of a black art, since
> it is heavily dependent on physical layout.
>
> I just got hold of their FQ916 VHF/UHF tuner module,
> and fairly easily got it to scan these bands.
>
> Tell us more about your app, and we may be able to be more helpful.
>
> KH
>