Jan Kandziora wrote
> Then maybe you don't have a shorted diode in the DS9503, but a burned
> series resistor in the same chip. That's a common mode of failure, too,
> I had them a while ago.
>
> This problem is usually created by connecting something to the Pin 2 GND
> of the DS9490R. -> CHECK YO
Am 14.04.2014 14:44, schrieb vermus:
> vermus wrote
>> ps. Can you give a bus voltage from DS9490R ? In my case it ~ 1 Volt (3
>> and 4 pin), but AFAIK sensors on parasite power needs 3-5V...
>
> i was right..
>
> "Typically, 1-Wire slave devices operate over the voltage range of 2.8V
> (min) to
vermus wrote
> ps. Can you give a bus voltage from DS9490R ? In my case it ~ 1 Volt (3
> and 4 pin), but AFAIK sensors on parasite power needs 3-5V...
i was right..
"Typically, 1-Wire slave devices operate over the voltage range of 2.8V
(min) to 5.25V (max)."
Something wrong with my DS9490R.
Off the top of my head:
Link-USB (ibuttonlink.com)
USB9097
http://www.ebay.com/itm/PCsensor-1-Wire-adapter-thermometer-replace-DS9097-DS9490-NEW-/281307951738?pt=US_Weather_Meters&hash=item417f42b27a
The latter uses the serial protocol and so is slightly slower for large
directories. The LINK is
Paul Alfille-2 wrote
> Page 5 of the datasheet (
> http://datasheets.maximintegrated.com/en/ds/DS9490-DS9490R.pdf) has a
> schematic including the DS9503 diode that might be a problem.
>
> On the other hand, it's probably not worth your time chasing this down,
> rather than just buying another 949
Page 5 of the datasheet (
http://datasheets.maximintegrated.com/en/ds/DS9490-DS9490R.pdf) has a
schematic including the DS9503 diode that might be a problem.
On the other hand, it's probably not worth your time chasing this down,
rather than just buying another 9490R.
This doesn't seem to be too
Paul Alfille-2 wrote
> For reference I've included the initialization sequence for a functioning
> DS9490R:
>
> DEBUG MODE
> libow version:
> 2.9p3
>
> .
>
> CONNECT: ow_usb_cycle.c:(68) Bus master found: 1:6
> DEFAULT: ow_usb_msg.c:(295) Opened USB DS9490 bus master at 1:6.
>CALL: ow_
For reference I've included the initialization sequence for a functioning
DS9490R:
DEBUG MODE
libow version:
2.9p3
DEBUG: ow_daemon.c:(166) main thread id = 140457333811008
DEBUG: ow_avahi_link.c:(71) Avahi support: libavahi-client loaded
successfully
DEBUG: ow_avahi_link.c:(73) Avahi librar
>A possible bug is a shorted DS9503 protective diode in the device. This
>happens after static overvoltage on the bus line, e.g. wrongly connected
>+12V to 1W. Static discharge is unlikely, the diode is designed to
>survive a short peak.
>Open the DS9450 (TX5 screw under the label, two clips at th
Am 13.04.2014 09:18, schrieb vermus:
> I have DS9490R and "1-wire bus short circuit" in logs.
>
> Cable don't connected. What is this mean? How to test device?
>
A possible bug is a shorted DS9503 protective diode in the device. This
happens after static overvoltage on the bus line, e.g. wrongl
I have DS9490R and "1-wire bus short circuit" in logs.
Cable don't connected. What is this mean? How to test device?
logs:
Apr 13 10:37:18 localhost OWFS[2461]: DEBUG: ow_select.c:(66) Selecting a
path (and device) path=/ SN=00 00 00 00 00 00 00 00 last path=00 00 00 00 00
00 00 00
Apr 13 1
11 matches
Mail list logo
