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'[EE]: 1 Minute (and over ) WDT'
2001\01\10@091325 by Simon-Thijs=20de=20Feber?=

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Hello All,


Can any one advise me on a circuit/device which can
generate pulses every minute or more (i am thinking of
1-5 minutes ).
The circuit needs to ,preferably, be on the I2C bus.

I have looked at the PCF8583 (8-pin device) but i need
to reset the Interrupt bij Software and that is not
what i want.

Intention is to make a battery charger with a 16F84
and checks the voltage every 1 to 5 minutes.
I do not want to use internal wdt's/counters or
anything else cause this 16F84 has to do more jobs.


grtz,


Simon




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2001\01\10@094008 by Simon Nield

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how about a 555 timer?
i would however be stunned if you can't find a few intruction cycles & program space to for example
increment a counter on a TMR0 generated interrupt, even if you are using TMR0 for something else too
- it's not like you are in need of precision timing by the sound of it.

Regards,
Simon

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2001\01\10@101125 by Simon-Thijs=20de=20Feber?=

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Hello,


Well the intention is that in the 16F84 will run :
1. Volume ctrl (with rotary encoder)
2. Channel ctrl (with rotary encoder)
3. LCD ctrl
4. battery charging


1 and 2 are done on 2 interupts (on change).
But all devices, so far, will work on the I2C bus.
for 1 ,2 and 3 i will use a PCF8574.

best regards,


Simon


--- Simon Nield <simon.nieldspamKILLspamQUANTEL.COM> wrote: > how
about a 555 timer?
{Quote hidden}

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2001\01\10@131500 by mike

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On Wed, 10 Jan 2001 14:13:05 +0000, you wrote:

>Hello All,
>
>
>Can any one advise me on a circuit/device which can
>generate pulses every minute or more (i am thinking of
>1-5 minutes ).
>The circuit needs to ,preferably, be on the I2C bus.
>
>I have looked at the PCF8583 (8-pin device) but i need
>to reset the Interrupt bij Software and that is not
>what i want.
>
>Intention is to make a battery charger with a 16F84
>and checks the voltage every 1 to 5 minutes.
>I do not want to use internal wdt's/counters or
>anything else cause this 16F84 has to do more jobs.
PIC12C508 - if power is an issue, calibrate the WDT off the INTRC osc.
I doubt you'll find anything cheaper, certainly nothing more flexible.
If you need accuracy, clock it from a 32K768 watch crystal.
Another possibility might be a CMOS 4060 osc/counter but the RC values
might be a bit big, and stability won't be good.
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