The Remote-Sensor is connected to GND and the filter is designed as shown in
But now the value from the remote sensor is allways @upper limit!
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The Remote-Sensor is connected to GND and the filter is designed as shown in
But now the value from the remote sensor is allways @upper limit!
Hi,
- Insert Image doesn't work -> what a the rules therefor (I tried bmp / jpeg / png ...)
Please follow this Link
Kind regrads
Bernd
Dear Bernd -
here is where that link goes for me:
if you want to insert a file, you can use the tool bar at the bottom of the post
This will take you to a browse window for the file you want to attach.
Bernd,
Do you represent the same company/design as what was discussed in the following e2e post? https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/810432/tmp464-connection-to-devices-with-only-dxp-pin-and-dxn-tied-to-gnd
If so, the problem was resolved. What has changed about the design since then?
If this is not your circuit, could you please tell us more about your design?
thanks,
ren
Hi Bernd,
As per request by our customer. I have attached here the images for schematic for your review.
See below.
Best regards,
Jonathan
Is the OPEN bit being set in the Status register?
What is the junction connected to TKDiode? A 2 pin discrete diode will not work. A 3 pin discrete transistor is needed, even though only 2 conductors will be used to connect it. Some embedded junctions will not be compatible, either, depending on their structure.
thanks,
ren
Hi ren,
we have tested different transistor f.e. BC859C and 2N3906 and connected the 3 Pins as show in https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/810432/tmp464-connection-to-devices-with-only-dxp-pin-and-dxn-tied-to-gnd?tisearch=e2e-sitesearch&keymatch=tmp464%25252520gnd#
Bernd
Dear Bernd -
I am jumping in here for a moment as Ren is out of the office currently. Here I would recommend you take a look at this application note:
https://www.ti.com/lit/an/sboa433/sboa433.pdf
Inside, you will find a list of transistors that were tested for use as remote temperature junctions and then a table of recommended transistor part numbers that were found to be adequate for this type of usage. (Table 5-1 on page 6)
Bernd,
Could you please check the OPEN bit in the Status register for me?
Something doesn't add up; I have to ask you to double check your connections or show us more detail so we can check ourselves. What is the return path for ground? What other devices share this ground? Can you show me your D+ on oscilloscope?
thanks,
ren