Choosing new controller

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Silver Markadmin
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Posted by admin: Mon. Jul 23, 2001 - 10:42 AM
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Hi all (and Atmel technical sales in particular :-)

I've been using the Tiny12 for a while now and am quite satisfied with it. But now there is a call for more functionality, and that translates into one or two more IO pins. Do you have any suggestions for a device that would do that?

The features I really need (and have on the Tiny12) are:

No forgetting with reset (as the 90S1200 does)

Easy distinguishing of reset source (watchdog, external, power, brown out)

Crystal driving (there has to be a crystal here)

Low power (battery driven, I need to disable the crystal from time to time)

Little area (SOIC-8 or SSOP-20 are fine until die mounting becomes an issue)

I'd also like to know if there are up-and-coming controllers that will do this. The perfect thing would be to put a Tiny12 in an SSOP-12 can with more IO.

--
Børge

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Tags:

AVR Microcontrollers, megaAVR and tinyAVR, AT90S1200
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danni
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Posted by danni: Mon. Jul 23, 2001 - 06:55 PM
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Hi Børge,

I'm also searching for somethink like you in a 20 pin case.
I need zero external components operation (selectable internal clock, right internal reset) so the 1200 or 2313 can't do the job today. But I'm not unhappy, if I can get a 20 pin device with 4kB code Flash.

It should work as intelligent supervisor circuit to provide power on reset, watchdog function and in application programming of a bigger micro. Thus why I need 100% reliability without depending from any external component. E.g. also if the crystal of the main processor was damaged, it can still send a service request on the bus.

It's a main issue, that we can make maintenance far from the gadgets allover the world and can then tell the customer: "please change module xxx".

If I can get it, I want it to place on every pcb, e.g. 12 pieces on our new gadgets.

Børge, have you made always good experience, that the tiny12 works reliable ?
I meant, if it was working really every time also, if the power raises slow, fast, often or not from zero ?

Peter

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Silver Markadmin
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Posted by admin: Mon. Jul 23, 2001 - 08:50 PM
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Looking at the matrix of AVR processors, it becomes pretty obvious that the more FLASH you get, the more "everything else" you get. This is a problem Microchip has solved quite nicely. You can pretty much pick any part with any peripherial combination, and only pay for what you're going to use.

Hopefully, Atmel will more fully populate a similar matrix. The Mega series are very nice, but I could use something like a 4433, with 8K FLASH, 1K RAM, and no SPI. I don't want/need to pay for PWM, self-programming, and other peripherials I'm not going to use.

Another variant I'd with for is the 4433 with the 8K FLASH, 1K RAM, and DUAL UARTs. Tiny processors with dual UARTS make for killer protocol conversion engines. Like Conexant binary in, NMEA out. Or serial in, MIDI out.

Something with an integrated USB core would be nice, too. And not in a high end Mega part. I'd like to be able to have something akin to the '232 and '245 USB chips, integrated on the die. In fact, have you considered purchasing that technology, Atmel?

That would be just too sweeeet.

--John

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