I2C controlled simple PWM chip

[Gokhan OZCAN ZORBeY^]

hi everyone,
Do you know any I2C controlled Pulse width modulator chip? I am
looking for an alternative to DS1050 .
Best Regards
Gokhan

[Rich Webb]

On Mon, 21 Nov 2011 23:17:05 -0800 (PST), "Gokhan OZCAN ZORBeY^"
<gokha...@gmail.com> wrote:

>hi everyone,
>Do you know any I2C controlled Pulse width modulator chip? I am
>looking for an alternative to DS1050 .

Perhaps something like an ATtiny20, which implements I2C slave and has
several PWM channels and an internal oscillator? Obviously it is not a
direct replacement but in place of a single 5-bit PWM there is a 16-bit
counter with two PWM channels and an 8-bit timer also with two PWM
channels plus the additional I/O and "smarts" of a microcontroller.

--
Rich Webb Norfolk, VA

[petrus bitbyter]

"Rich Webb" <bbe...@mapson.nozirev.ten> schreef in bericht
news:1s6nc758r2krb4hvg...@4ax.com...

That DS1050 is a (relative) simple 8-pins thing that can emulated by an
equally simple 8-pins micro. I'd use a PIC12F629 as I'm familiar with it but
no doubt you can use a similar Atmel chip as well. The PIC's I2C-slave code
is available on the net and the 5-bits PWM can be written quite easily. The
only drawback may be the pinning as you cannot make it pin-compatible.

petrus bitbyter

[Jamie]

ah but!, to be used as a replacement part, as I have done with a few
things in the past, you make a daughter board with equal pins on the
bottom to mount in existing place with the programmable chip on top! :)

This was one of my favorite things to do years ago when over riding
forked PLL chips for extra band space! :)

Jamie

[Gokhan OZCAN ZORBeY^]

On Nov 23, 2:06 am, Jamie

<jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote:
> petrus bitbyter wrote:

> > "Rich Webb" <bbew...@mapson.nozirev.ten> schreef in bericht

I was looking for something non-programmable to save from the
production programming cost.
Pin-to-pin compatibility is not a must have because re-design is
already planned.

I am familiar with PIC too. I guess an PIC12F1822 can be a good
alternative with I2C module and CCP unit. Internal oscillator makes it
more attractive.
I may re-map the CCP (PWM) to RA5 so that I can use both I2C and CCP
units. For the programming, I can program it (ICSP) with my bigger CPU
to save from production cost. There is no high voltage on the board
therefore I can only use Low voltage programming.

In any case if you know a non-programable option, I would like to hear
it too.
Thanks for the answers
Gokhan