While we are on this topic, how about MSP430F147?

You can do eight 16-bit PWMs using the built-in peripherals - Timer_A
with 3 capture/compare modules, and Timer_B with 7 capture/compare
modules. The period is programmable and would be synchronous for all
modules of each timer. Max timer clock frequency is 10 MHz at 3 V, but
maybe it can go up to 20 MHz at 3.6 V...

There are also two UART/SPI modules in this chip. Leaves nothing to do
in software :)

As an alternative, there is Ubicom SX52BD which can do two 16-bit PWMs
at 100 MHz. This way a 12 bit resolution, 20 kHz period is possible.
One chip for two channels though.


 Nikolai

---- Original Message ----
From: Edson Brusque <ebrusque@TERRA.COM.BR>
Sent: Saturday, May 12, 2001 20:00:49
  To: PICLIST@MITVMA.MIT.EDU
Subj: [PIC]: MSP430 (now what about a real world application?)  :^)

> Hello DSP guys, :)

>     we are working on an application for some time now, and I'm wanting to
> contract someone to help me in one of the hard parts of the project.

>     I need a microcontroller, DSP, something that can generate 12 PWM's
> simultaneously. Each PWM must have frequency above 20kHz and duty cycle with
> minimum 10bits resolution. 12 or 16 bits of resolution if possible would be
> kickass.

>     I know this is a very dificult thing to do.
>         20,000 (Hz) * 1024 (duty) = 2,048,000 "steps" by second
>         2,048,000 * 12(channels) = 24,576,000 "steps" by second
>         24,576,000 * 12 (instructions for each step, for example) =
>             = 294,912,000 instructions!

>     That would need a lot of processing power. Maybe some 16bit DSP at
> 400MIPS could do it?

>     The unit must receive the instructions (mainly duty cycles values) via a
> serial interface.

>     If someone is interested, please email me and we can talk about
> development costs, royalties, etc.

>     Best regards,

>     Brusque

> -----------------------------------
> Edson Brusque
> Research and Development
> C.I.Tronics Lighting Designers Ltda
> (47) 323-2138  /  (47) 9993-6453
> Blumenau  -  SC  -  Brazil
> www.citronics.com.br
> -----------------------------------

> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics