1-wire device
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Posts: 46,084
Hi, maybe this is a stupid question but I don't have the answer so
if somebody could educate me it would be apprecaited.
I'm using 6 off DS18S20 temp devices on a one bus wire and a 400 ohm
pull down resistor. Now, my plan is to add one additional 1 wire
devices, a timer device DS 2404, which acc to spec require a pull-up
resistor.
Should I use both or just the pull down
br Lars
if somebody could educate me it would be apprecaited.
I'm using 6 off DS18S20 temp devices on a one bus wire and a 400 ohm
pull down resistor. Now, my plan is to add one additional 1 wire
devices, a timer device DS 2404, which acc to spec require a pull-up
resistor.
Should I use both or just the pull down
br Lars
Comments
typically 4.7K, but you may need to stiffen it (say down to 1K) if your
1-Wire connection is long or has a lot of capacitance.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: lars505050 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=c8_7QPhwLWE_QCCjG7Pd2Doxlk1wu9vpmiG4CI-2auzuwc6qaGXlxJ92tg5nQfYmq3QLH76YFKRl3Q8]ls@l...[/url
Sent: Monday, April 12, 2004 2:47 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] 1-wire device
Hi, maybe this is a stupid question but I don't have the answer so
if somebody could educate me it would be apprecaited.
I'm using 6 off DS18S20 temp devices on a one bus wire and a 400 ohm
pull down resistor. Now, my plan is to add one additional 1 wire
devices, a timer device DS 2404, which acc to spec require a pull-up
resistor.
Should I use both or just the pull down
br Lars
a 400 ohm "Pull up" but not more than 16 meters of cable, I guess
that not an issue as long it works.
br
Lars
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> You should be using a pull-UP on a 1-Wire buss (not a pull-down) --
> typically 4.7K, but you may need to stiffen it (say down to 1K) if
your
> 1-Wire connection is long or has a lot of capacitance.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: lars505050 [noparse][[/noparse]mailto:ls@l...]
> Sent: Monday, April 12, 2004 2:47 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] 1-wire device
>
>
> Hi, maybe this is a stupid question but I don't have the answer so
> if somebody could educate me it would be apprecaited.
>
> I'm using 6 off DS18S20 temp devices on a one bus wire and a 400
ohm
> pull down resistor. Now, my plan is to add one additional 1 wire
> devices, a timer device DS 2404, which acc to spec require a pull-
up
> resistor.
>
> Should I use both or just the pull down
>
> br Lars