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'[OT] (?) 3 or 4 PWM IC'
2005\08\07@110639 by ianlesnet

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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




2005\08\07@115921 by Andre Abelian

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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




spam_OUTianlesnetTakeThisOuTspamcwazy.co.uk wrote:

{Quote hidden}

2005\08\07@120647 by Herbert Graf

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On Sun, 2005-08-07 at 16:05 +0100, .....ianlesnetKILLspamspam@spam@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:

I'm not sure where you were looking, but several of the dsPICs have 4
PWM outputs. Check any of the motor control family dsPICs. The 3011,
4011 and 4013 all have 4 PWM channels.

If you need more then 4 the 5011, 5013, 6010, 6011, 6012, 6013 and 6014
all have 8 outputs, however they are not available in DIP.

TTYL


-----------------------------
Herbert's PIC Stuff:
http://repatch.dyndns.org:8383/pic_stuff/

2005\08\07@121610 by John J. McDonough

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For something that slow, maybe banging it out in firmware is a better
approach.  But another option is something like 2 - 16F737's.  You get 3
PWM's each and I2C.  Of if you're really hung up about real estate, there
are a couple of TQFP's with 5 PWMs.  Another apporach would be to go to
something like the 30F2010 with 6.

--McD

{Original Message removed}

2005\08\07@132003 by Marcel Duchamp
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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
>
> 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.

Checkout TLC5940 from TI, available from Digikey.

 16 pwm outputs, 12 bit resolution, serial data stream input, cascadable.

2005\08\07@233926 by Charles Linquist

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I use the 18F8722.  It has 5 *hardware* PWM channels.

Charles Linquist


Marcel Duchamp wrote:
{Quote hidden}

2005\08\08@062443 by Russell McMahon

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> I'm not sure if this is OT, so I put it here to be sure.

Definitely [EE] !

> 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:

You've had lots of suggestions, but here's a few comments.

You could definitely use software PWM for LEDs (probably with
interrupt drive) on many processors. 8 channels would be easy.
The only limitation would be if you wanted a very large number of
steps - but this is unlikely for LEDs. Maybe if you needed a large
combined colour space. With say 4 channels and 64 steps, to get say 1
kHz frame rate you need 64 kHz bit rate or about 60 uS interrupt rate.
If you used a PIC at 20 MHz that would give around 300 instructions
per cycle. Ample room with time to do lots else as well.

Many AVRs have 4 PWM or more.
eg ATMega44 family have 4 (or is it 6).
A capable device with many other hardware features (UART, IIC, A2D,
...) and a free (gulp) BASIC compiler (BASCOM) available for it.

I think one of the Philip's LPC family has 8 x hardware PWM.
(8051 based processor).



           RM

2005\08\09@063405 by ianlesnet

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Thank you all for the great suggestions.  I ordered a few TLC5490s to play
with, I think this is the chip I was looking for.  Serial interface, 16
PWMs, and available in DIP.

I would love to try the 18f8722, but I'm not yet able to work with such
small components.  I will definitely keep it in mind though.

Cheers,

Ian




Russell McMahon wrote:

{Quote hidden}

drive) on many processors. 8 channels would be easy.
> The only limitation would be if you wanted a very large number of steps
- but this is unlikely for LEDs. Maybe if you needed a large combined
colour space. With say 4 channels and 64 steps, to get say 1 kHz frame
rate you need 64 kHz bit rate or about 60 uS interrupt rate. If you used
a PIC at 20 MHz that would give around 300 instructions per cycle. Ample
room with time to do lots else as well.
>
> Many AVRs have 4 PWM or more.
> eg ATMega44 family have 4 (or is it 6).
> A capable device with many other hardware features (UART, IIC, A2D, ...)
and a free (gulp) BASIC compiler (BASCOM) available for it.
>
> I think one of the Philip's LPC family has 8 x hardware PWM.
> (8051 based processor).
>
>
>
>            RM



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