Ian,

Scott Dattalo has nice 8 pwm routine I do not think you need any other 
hardware.
His routine can control 8 pwm simultaneously.
http://www.dattalo.com/technical/software/pic/pwm8.asm

Andre




ianlesnet@cwazy.co.uk wrote:

>Hello,
>
>I'm not sure if this is OT, so I put it here to be sure.
>
>I am looking for an IC with 3 or 4 hardware pulse width modulators, with
>any kind of interface (I2C, SPI, etc).  My current project is to make
>accent lights for my apartment using red/blue/green + white LEDs.  I
>didn't see any PICs with 4 PWMs, but I have found some almost suitable
>solutions:
>
>Phillips makes the PCA 9530/1/2/3, an I2C LED dimmer with 2 to 16 bit I/O
>- though each model has only two PWMs total.  Also, the SO form parts
>don't seem to actually be purchasable.
>
>The MAX 7313/4/5/6 are similar, though they have PWM on each I/O bit. 
>This IC, however, has only 16 preset PWM steps, and comes only in QFN/QSOP
>packages.
>
>Is anyone familiar with an IC that might work? Something with 3 or 4 PWMs
>in SO/DIP would be ideal, it doesn't need to drive the LEDs directly like
>the chips above.
>
>Thank you,
>
>Ian
>
>
>
>
>  
>

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