I2C controlled simple PWM chip

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" schreef in bericht news: snipped-for-privacy@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

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

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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