BS2 IC resets/reboots by itself

Archiver

I have a timer circuit that uses a BS2-IC that semingly resets itself
without warning.

The supply to the BS2 is a reliable 12V Gel Battery via a 7805
voltage regulator.

The program has a main loop that:

Gets data from a serial timer chip
Calculates current time
Outputs multiplexed BCD data to external TTL circuit
Hits bottom of loop & repeats from top of loop

There is no reset in software or via the reset pin
Reset is via a simple power off then power on ...

The timer is expected to run for up to 40 hours and the software has
tested OK for this duration. However, resets have occurred at
unscheduled points from 1/2 hour to 20 hours

I have replaced the BS2 with a new one and the bug is still there.
Can anyone with any experience of this problem please help?

Keith

Archiver

I have a timer circuit that uses a BS2-IC that seemingly resets
itself without warning.

The supply to the BS2 is a reliable 12V Gel Battery via a 7805
voltage regulator.

The program has a main loop that:

Gets data frem a serial timer chip
Calculates current time
Outputs multiplexed BCD data to external TTL circuit
Hits bottom of loop & repeats from top of loop

There is no reset in software or via the reset pin
Reset is via a simple power off then power on ...

The timer is expected to run for up to 40 hours and the software has
tested OK for this duration. However, resets have occurred at
unscheduled points from 1/2 to 20 hours.

I have replaced the BS2 with a new one and the bug is still there.
Can anyone with any experience of this problem please help?

Keith

Archiver

At 08:06 PM 9/13/2000 +0000, you wrote:
>I have a timer circuit that uses a BS2-IC that seemingly resets
>itself without warning.
>
>The supply to the BS2 is a reliable 12V Gel Battery via a 7805
>voltage regulator.
>
>The program has a main loop that:
>
>Gets data frem a serial timer chip
>Calculates current time
>Outputs multiplexed BCD data to external TTL circuit
>Hits bottom of loop & repeats from top of loop
>
>There is no reset in software or via the reset pin
>Reset is via a simple power off then power on ...
>
>The timer is expected to run for up to 40 hours and the software has
>tested OK for this duration. However, resets have occurred at
>unscheduled points from 1/2 to 20 hours.
>
>I have replaced the BS2 with a new one and the bug is still there.
>Can anyone with any experience of this problem please help?


Hi Keith -

Are there extremes of temperature ?

Bruce


>Keith

Archiver

Check out Al Williams "Stamp FAQ" [noparse][[/noparse]this is a great resource, by the way, for
both the beginner and the expert].

Look at FAQ #2.14 (Stamp Resets)

http://www.al-williams.com/wd5gnr/stampfaq.htm

>

---

> From: Keith Ledgard
> Reply To: basicstamps@egroups.com
> Sent: Wednesday, September 13, 2000 1:06 pm
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] BS2 IC resets/reboots by itself
>
> I have a timer circuit that uses a BS2-IC that seemingly resets
> itself without warning.
>
> The supply to the BS2 is a reliable 12V Gel Battery via a 7805
> voltage regulator.
>
> The program has a main loop that:
>
> Gets data frem a serial timer chip
> Calculates current time
> Outputs multiplexed BCD data to external TTL circuit
> Hits bottom of loop & repeats from top of loop
>
> There is no reset in software or via the reset pin
> Reset is via a simple power off then power on ...
>
> The timer is expected to run for up to 40 hours and the software has
> tested OK for this duration. However, resets have occurred at
> unscheduled points from 1/2 to 20 hours.
>
> I have replaced the BS2 with a new one and the bug is still there.
> Can anyone with any experience of this problem please help?
>
> Keith
>
>
>
>