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Discussion Groups | AVRclub | AW: [AVR club] Re: Triggered Inputs?
Atmel AVR Microcontroller discussion group.
AW: [AVR club] Triggered Inputs? - Rompf Tobias ZFS MKK - Sep 15 10:29:00 2004
Hmmm, I thought it was an english word?!? In German we use "Trigger"
for:
For example a "trigger" gets an signal from 0 to 7 V,
if the Input-Signal is under (e.g.) 4V the Output-Signal stays at 0V,
if the Input-Signal is above 4V the Output-Voltage is 5V
What's the english word for that?
-----Ursprüngliche Nachricht-----
Von: Dave VanHorn [mailto:dvanhorn@dvan...]
Gesendet: Mittwoch, 15. September 2004 16:14
An: avrclub@avrc...; avrclub@avrc...
Betreff: Re: [AVR club] Triggered Inputs? At 06:10 AM 9/15/2004, Rompf Tobias ZFS MKK wrote:
>Hey Folks,
>
>are the Ports of the Atmega 128 triggered in any way? (sure they are,
>but how good)
What do you mean by "trigger"?
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For example a "trigger" gets an signal from 0 to 7 V,
if the Input-Signal is under (e.g.) 4V the Output-Signal stays at 0V,
if the Input-Signal is above 4V the Output-Voltage is 5V
What's the english word for that?
-----Ursprüngliche Nachricht-----
Von: Dave VanHorn [mailto:dvanhorn@dvan...]
Gesendet: Mittwoch, 15. September 2004 16:14
An: avrclub@avrc...; avrclub@avrc...
Betreff: Re: [AVR club] Triggered Inputs? At 06:10 AM 9/15/2004, Rompf Tobias ZFS MKK wrote:
>Hey Folks,
>
>are the Ports of the Atmega 128 triggered in any way? (sure they are,
>but how good)
What do you mean by "trigger"?
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<http://us.adserver.yahoo.com/l?M=295196.4901138.6071305.3001176/D=groups/S=:HM/A=2128215/rand=168804028 _____
> .
[Non-text portions of this message have been removed]
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Re: AW: [AVR club] Triggered Inputs? - Dave VanHorn - Sep 15 10:51:00 2004
At 09:29 AM 9/15/2004, Rompf Tobias ZFS MKK wrote:
>Hmmm, I thought it was an english word?!? In German we use "Trigger" for:
>
>For example a "trigger" gets an signal from 0 to 7 V,
>if the Input-Signal is under (e.g.) 4V the Output-Signal stays at 0V,
>if the Input-Signal is above 4V the Output-Voltage is 5V
>
>What's the english word for that? It's an english word, but not often used in this context.
The input pins are schmidt triggered but I don't think atmel gives much info other than the guaranteed thresholds in the data sheets.
I wasn't sure if you meant the input voltage threshold, or wether the pins could trigger an interrupt, or trigger a timer.. It's ambiguous.
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>Hmmm, I thought it was an english word?!? In German we use "Trigger" for:
>
>For example a "trigger" gets an signal from 0 to 7 V,
>if the Input-Signal is under (e.g.) 4V the Output-Signal stays at 0V,
>if the Input-Signal is above 4V the Output-Voltage is 5V
>
>What's the english word for that? It's an english word, but not often used in this context.
The input pins are schmidt triggered but I don't think atmel gives much info other than the guaranteed thresholds in the data sheets.
I wasn't sure if you meant the input voltage threshold, or wether the pins could trigger an interrupt, or trigger a timer.. It's ambiguous.
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Re: AW: [AVR club] Triggered Inputs? - Ralph Hilton - Sep 15 10:58:00 2004
On Wed, 15 Sep 2004 16:29:00 +0200 you wrote:
>Hmmm, I thought it was an english word?!? In German we use "Trigger" for:
>
>For example a "trigger" gets an signal from 0 to 7 V,
>if the Input-Signal is under (e.g.) 4V the Output-Signal stays at 0V,
>if the Input-Signal is above 4V the Output-Voltage is 5V
>
>What's the english word for that?
"Trigger" can be a noun or a verb.
Interrupts can be triggered by voltage input changes.
A more specific term is "comparator" (Komparatoren in german). Searching the datasheet on
both terms should give plenty of useage examples.
--
Ralph Hilton
http://www.ralphhilton.org
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net
(You need to be a member of avrclub -- send a blank email to avrclub-subscribe@yahoogroups.com )
>Hmmm, I thought it was an english word?!? In German we use "Trigger" for:
>
>For example a "trigger" gets an signal from 0 to 7 V,
>if the Input-Signal is under (e.g.) 4V the Output-Signal stays at 0V,
>if the Input-Signal is above 4V the Output-Voltage is 5V
>
>What's the english word for that?
"Trigger" can be a noun or a verb.
Interrupts can be triggered by voltage input changes.
A more specific term is "comparator" (Komparatoren in german). Searching the datasheet on
both terms should give plenty of useage examples.
--
Ralph Hilton
http://www.ralphhilton.org
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net
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AW: [AVR club] Re: Triggered Inputs? - Rompf Tobias ZFS MKK - Sep 16 2:20:00 2004
Thanks everyone a lot for the hints.
-----Ursprüngliche Nachricht-----
Von: Graham Davies [mailto:YahooGroups@Yaho...]
Gesendet: Mittwoch, 15. September 2004 22:57
An: avrclub@avrc...
Betreff: [AVR club] Re: Triggered Inputs? --- In avrclub@avrc..., "Rompf Tobias ZFS MKK"
<Tobias.Rompf@z...> wrote:
> are the Ports of the Atmega 128
> triggered in any way? ...
> I wanna be able to use input
> Voltages from 5 to 30 V.
I don't know if these questions were fully answered or not, so I will
have a go.
I assume you're asking first if the ATmega128 has schmitt trigger
inputs. I have checked the ATmega64 data sheet, because that's all I
have with me, and it shows a schmitt trigger in the circuit diagram
of the "General Digital I/O" ports. The only mention of a hysteresis
value is in the electrical characteristics of the two-wire serial
bus. It is given as 5% of VCC, which isn't very much. You should
check the ATmega128 data sheet.
When you say you want to use input voltages of 5 to 30 volts, I don't
know what this has to do with schmitt trigger inputs. You can't do
this, schmitt trigger or not. The Absolute Maximum Ratings section of
the data sheet gives the voltage on I/O pins with respect to ground
as no lower than -1.0 volts and no higher than VCC + 0.5 volts. This
is because there are static protection diodes on the inputs. You will
need an external level translator.
Graham.
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-----Ursprüngliche Nachricht-----
Von: Graham Davies [mailto:YahooGroups@Yaho...]
Gesendet: Mittwoch, 15. September 2004 22:57
An: avrclub@avrc...
Betreff: [AVR club] Re: Triggered Inputs? --- In avrclub@avrc..., "Rompf Tobias ZFS MKK"
<Tobias.Rompf@z...> wrote:
> are the Ports of the Atmega 128
> triggered in any way? ...
> I wanna be able to use input
> Voltages from 5 to 30 V.
I don't know if these questions were fully answered or not, so I will
have a go.
I assume you're asking first if the ATmega128 has schmitt trigger
inputs. I have checked the ATmega64 data sheet, because that's all I
have with me, and it shows a schmitt trigger in the circuit diagram
of the "General Digital I/O" ports. The only mention of a hysteresis
value is in the electrical characteristics of the two-wire serial
bus. It is given as 5% of VCC, which isn't very much. You should
check the ATmega128 data sheet.
When you say you want to use input voltages of 5 to 30 volts, I don't
know what this has to do with schmitt trigger inputs. You can't do
this, schmitt trigger or not. The Absolute Maximum Ratings section of
the data sheet gives the voltage on I/O pins with respect to ground
as no lower than -1.0 volts and no higher than VCC + 0.5 volts. This
is because there are static protection diodes on the inputs. You will
need an external level translator.
Graham.
Yahoo! Groups Sponsor
ADVERTISEMENT
click here <http://us.ard.yahoo.com/SIG=129s30681/M=295196.4901138.6071305.3001176/D=groups/S=1706554205:HM/EXP=1095368230/A=2128215/R=0/SIG=10se96mf6/*http://companion.yahoo.com>
<http://us.adserver.yahoo.com/l?M=295196.4901138.6071305.3001176/D=groups/S=:HM/A=2128215/rand=478541905 _____
> .
[Non-text portions of this message have been removed]
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