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Date: Tue, 02 Dec 2003 12:30:56 +0100
From: JSchneide@t-online.de (Joerg Schneide)
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Subject: SPI functions
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Hi,

has anyone used the SPI function SPI_IO$ and can tell me if it is faster
than SHIFT_OUT/SHIFT_IN?
How does it behave if there is a gap (related to the clock pulses) or
a pause (related to time) between the send string from Tiger and the
answer from the device I want to talk to?

Thanks,
Joerg.

===> Contact mail-list administrator: webmaster@Kgsystems.com
===> Tiger info: http://www.industrialcontroller.com/wilke/
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From owner-tigers-beastsign@router.xnet2.com Tue Dec  2 21:53:41 2003
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Subject: Input port protection on Tiny Tiger
Date: Wed, 3 Dec 2003 13:50:49 +1000
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Hi All,

I am looking at adding a direct input from a remote switch direct to a Tiger
I/O port pin.  I dont see any specs on the max input current/voltage a pin
is designed to stand.  Unfortunately there isnt much room in the existing
design for extra components, so I cant afford too much space.  I was hoping
that just a pullup resistor, around 100 K, plus a series resistor of 15 K or
so between the switch/pullup junction and the pin would protect against
reasonable overvoltage, say 12 volts max.   The switch will be on the end of
a couple of metres of cable, in a fairly quiet environment - ie no big
motors, solenoids, etc, but some intermittent RF from a 5 watt transmitter
nearby.  We can test for RF sensitivity, I'm more worried about things like
damage from spikes caused by static discharge etc.

Any thoughts ?

Regards,

Adrian Jansen     adrianjansen@internode.on.net
J & K MicroSystems
Microcomputer solutions for industrial control

===> Contact mail-list administrator: webmaster@Kgsystems.com
===> Tiger info: http://www.industrialcontroller.com/wilke/
===> Unsubscribe or view archive: http://kgsystems.xnet2.com
===> Purchase Tigers (USA): http://www.kgtechsales.com

From owner-tigers-beastsign@router.xnet2.com Wed Dec  3 08:18:34 2003
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From: "John Bode" <jbode@brgproducts.com>
To: <tigers@kgsystems.com>
Subject: RE: Input port protection on Tiny Tiger
Date: Wed, 3 Dec 2003 08:17:57 -0600
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Adrian,

We have huindreds of installations that use external control lines
connected
to the Tiger.  When we first started, the wires were connected directly
to the processor.
However, many installations experienced interference on the lines and 
disrupted operation.  Some were located in relatively low RF
environments.  Some
had longer wire runs than others.  We now use opto isolators on all
external control 
lines.  We no longer experience any problems with noise on the control
lines.

Best Regards,

John Bode
BRG Precision Products
 

-----Original Message-----
From: owner-tigers@xnet2.com [mailto:owner-tigers@xnet2.com] On Behalf
Of Adrian Jansen
Sent: Tuesday, December 02, 2003 9:51 PM
To: tigers@kgsystems.com
Subject: Input port protection on Tiny Tiger


Hi All,

I am looking at adding a direct input from a remote switch direct to a
Tiger I/O port pin.  I dont see any specs on the max input
current/voltage a pin is designed to stand.  Unfortunately there isnt
much room in the existing design for extra components, so I cant afford
too much space.  I was hoping that just a pullup resistor, around 100 K,
plus a series resistor of 15 K or so between the switch/pullup junction
and the pin would protect against
reasonable overvoltage, say 12 volts max.   The switch will be on the
end of
a couple of metres of cable, in a fairly quiet environment - ie no big
motors, solenoids, etc, but some intermittent RF from a 5 watt
transmitter nearby.  We can test for RF sensitivity, I'm more worried
about things like damage from spikes caused by static discharge etc.

Any thoughts ?

Regards,

Adrian Jansen     adrianjansen@internode.on.net
J & K MicroSystems
Microcomputer solutions for industrial control

===> Contact mail-list administrator: webmaster@Kgsystems.com ===> Tiger
info: http://www.industrialcontroller.com/wilke/
===> Unsubscribe or view archive: http://kgsystems.xnet2.com ===>
Purchase Tigers (USA): http://www.kgtechsales.com

===> Contact mail-list administrator: webmaster@Kgsystems.com
===> Tiger info: http://www.industrialcontroller.com/wilke/
===> Unsubscribe or view archive: http://kgsystems.xnet2.com
===> Purchase Tigers (USA): http://www.kgtechsales.com

From owner-tigers-beastsign@router.xnet2.com Wed Dec  3 09:28:02 2003
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Date: Wed, 03 Dec 2003 08:27:12 -0700
From: Gordon Hardman <geh@crosslinkinc.com>
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To: tigers@kgsystems.com
Subject: Re: Input port protection on Tiny Tiger
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  <035c01c3a979$29827ba0$75bc6596@adrian2>
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Adriaan,

I usually use a similar arrangement, but with a 100k or 220k in series,
instead of the 15k, if speed is not a problem. Have not seen any
problems, we use it near a 2W transmitter in the 800-900MHz range. On
PIC projects, I have used this arrangement on a controller for a 1.5kW
amp with no problems from RF.

Cheers

Gordon

Adrian Jansen wrote:
> 
> Hi All,
> 
> I am looking at adding a direct input from a remote switch direct to a Tiger
> I/O port pin.  I dont see any specs on the max input current/voltage a pin
> is designed to stand.  Unfortunately there isnt much room in the existing
> design for extra components, so I cant afford too much space.  I was hoping
> that just a pullup resistor, around 100 K, plus a series resistor of 15 K or
> so between the switch/pullup junction and the pin would protect against
> reasonable overvoltage, say 12 volts max.   The switch will be on the end of
> a couple of metres of cable, in a fairly quiet environment - ie no big
> motors, solenoids, etc, but some intermittent RF from a 5 watt transmitter
> nearby.  We can test for RF sensitivity, I'm more worried about things like
> damage from spikes caused by static discharge etc.
> 
> Any thoughts ?
> 
> Regards,
> 
> Adrian Jansen     adrianjansen@internode.on.net
> J & K MicroSystems
> Microcomputer solutions for industrial control
> 
> ===> Contact mail-list administrator: webmaster@Kgsystems.com
> ===> Tiger info: http://www.industrialcontroller.com/wilke/
> ===> Unsubscribe or view archive: http://kgsystems.xnet2.com
> ===> Purchase Tigers (USA): http://www.kgtechsales.com

-- 
Gordon Hardman

V.P., Chief Technical Officer                           email: 
geh@crosslinkinc.com
CrossLink Inc.                                                   phone: 
303.473.9232 x101
6185 Arapahoe Ave.                                             fax: 
303.473.9660
Boulder, CO 80303						WXRUN

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And a heaven in a wild flower,
Hold infinity in the palm of your hand
And eternity in an hour.

"Auguries of Innocence" by William Blake
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===> Contact mail-list administrator: webmaster@Kgsystems.com
===> Tiger info: http://www.industrialcontroller.com/wilke/
===> Unsubscribe or view archive: http://kgsystems.xnet2.com
===> Purchase Tigers (USA): http://www.kgtechsales.com

