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<font face="Arial">Bill,<br>
Still not sure what the confusion is. Definitely the JMP4 call
out in the table is incorrect; it should be JMP1. JMP4 is only
used to connect the CAT cable shield to the board ground.<br>
<br>
However, the JMP1 <i>position</i> can have a maximum of three
jumpers installed ... in which case, all three bits are 0's.<br>
So the condition shown in the list above table2 for the 9808
address 0x18 is correct: either all three JMP1 positions installed
in a remote board or plugged on as a PiHAT, JMP1 positions 3-4 and
5-6 occupied with position 1-2 'occupied' by the grounding of A0
at the Pi header.<br>
<br>
If you want to use address 0x1E, either occupy position 1-2,
leaving the others open OR use the board as a PiHAT, leaving the
other positions open.<br>
<br>
Scotty set the board up for the possibility of directly installing
the PNI MAG ASIC plus three orthogonal sensing inductors and
accompanying bias resistors along with a couple of other
components on the PC board, without using the PNI RM3100 test
board product as a plug in.<br>
<br>
However, JMP2 doesn't appear in the schematic and it's stated
function to disable RM3100 i2c addressing was probably intended to
disable an RM3100 test board if it was plugged into the female
header on the board in addition to the direct installation on the
board of the equivalent components. However, other than not
supplying 3.3 volt power to an RM3100 plug in, there is no simple
way of completely disabling it .... other than not plugging it in
! Not sure why we didn't catch that in the proofread.<br>
<br>
One other thing: the note on the schematic by the 9808 stating:<br>
<br>
LOCAL/STND ADR:0x1E<br>
REMOTE ADR: 0x1F<br>
<br>
should read:<br>
LOCAL/STND SDR: 0x18<br>
REMOTE ADR: 0x19<br>
<br>
To comply with what Dave Witten has been working with in control
software so far.<br>
<br>
Regards,<br>
Jules-K2KGJ<br>
<br>
<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 10/5/2021 7:59 PM, Bill Owens wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANVSWVg=hveM_W8CuPw=pTqQtMF0oDwdL6-x7MwO=o7PR+V5UQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default"
style="font-family:verdana,sans-serif">I marked up the PDF to
try to explain what I was seeing - hopefully it will make more
sense now. I realized another oddity exists in the description
as well; JMP2 is called out but does not seem to exist in the
current schematic. I'm guessing the description page was
written for an earlier rev that had a more limited set of
address selections, and had JMP2 in the circuit.</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">Bill.<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Oct 3, 2021 at 3:47 PM
Julius Madey <<a href="mailto:hillfox@fairpoint.net"
moz-do-not-send="true">hillfox@fairpoint.net</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> <font face="Arial">Bill,<br>
This is the i2c address space of the 9808 and RM3100 per
the data sheets......0 is ground and 1 is Vdd<br>
<br>
<br>
<img src="cid:part2.52D3F9A1.E4C23D62@fairpoint.net"
alt="" class=""><br>
<br>
I think you meant that JMP4 in the second column should be
JMP1 rather than the other way round. JMP4 is the shield
ground. <br>
<br>
When the local board is plugged on the Pi 40 pin header as
a PiHAT, A0 is pulled low, which limits the possible
address space for the RM3100 on the local board to 0x20
and 0x22, and the local 9808 to 0x18, 0x1A, 0x1C and
0x1E. <br>
<br>
For the remote board, all addresses in the above table are
available......except that used for the 9808 on the local
board. If no address jumpers are installed on the local
board, then 9808 addresses 0x19 through 0x1F are available
at the remote.<br>
<br>
Note that no more than four RM3100s can be used on the
same i2c bus ... expansion beyond that requires an i2c
multiplexer like the TCA9548a which Dave Witten and I were
considering for a test board for the RM3100 that would
service some 32 RM3100s.<br>
<br>
CAUTION regarding the note under extended mode in the
address tables and the use of multiple 9615 differential
i2c drops on the CAT5 or CAT6 cable. Read the 9615 data
sheet carefully on the subject of multiple drops ....
intended for short (~ 3meter cable runs) at a 1MHz bus
speed. My testing to 400+ feet was with only a local and
remote board at 100KHz bus speed which demonstrated well
behaved transmission line behavior for the ~100ohm twisted
pair lines in the cable with no reflections and no
transient spikes. <br>
<br>
The 9615 data sheet example for multiple drops on the
differential lines show NO termination resistances on the
intermediate drops and only line terminations at the
beginning and end 9615s. I'm going to hazard a guess
that you might be able to use 100 feet or so of cable with
a couple of intermediate drops within 3 or 4 feet of the
remote end and NO terminations on the 9615s on those
boards but would have to actually scope test that to
verify.<br>
<br>
The only multiple mag install on a single CAT cable I am
aware of is the one I'm using here with two RM3100 remote
boards within about 3 inches of one another connected only
by ground, +3.3V, SDA and SCL (eg i2c bus connections
only). <br>
<br>
Regards,<br>
Jules-K2KGJ<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</font><br>
<div>On 10/2/2021 11:36 PM, Bill Owens wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:verdana,sans-serif">I did get the
email - thank you! I looked through the info on the
second page of the PDF and I have some questions, but
it does confirm that there are options for as many as
four sensor boards, which fits with what I was
considering. <br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">I think the box
below the I2C table is wrong for the MCP9808; the
addresses should be 0x1E and 0x1F per the table, and
the callout in the schematic. It also mentions JMP1 in
the second column, I think that should be JMP4.<br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">I also noted
that JMP4 is described as being set only on the local
board in most locations, but shown as "Placed" on the
remote board in the NORMAL MODE and EXTENDED MODE
boxes. <br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">I'm curious
about whether there's a plan for deploying multiple
sensors; one of the notes implies that, without giving
any other details. Would it be a star configuration
with the Pi at the center, or a daisy-chain using both
the RJ45 and J10 for the boards in the middle?</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">Thanks,</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">Bill N2RKL<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Oct 2, 2021 at
1:54 PM Julius Madey via TangerineSDR <<a
href="mailto:tangerinesdr@lists.tapr.org"
target="_blank" moz-do-not-send="true">tangerinesdr@lists.tapr.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div> <font face="Arial">I answered Bill a few days
ago....perhaps he didn't receive the email. I
forwarded the latest schematic and layout for the
board which has a section on setting i2c
addresses. Perhaps Scotty can update that
further. <br>
Jules-K2KGJ<br>
<br>
</font><br>
<div>On 10/2/2021 12:00 PM, <a
href="mailto:tangerinesdr-request@lists.tapr.org"
target="_blank" moz-do-not-send="true">tangerinesdr-request@lists.tapr.org</a>
wrote:<br>
</div>
<blockquote type="cite">
<pre>Send TangerineSDR mailing list submissions to
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. FW: [HamSCI] Two questions about the new TAPR magnetometer
board (Dr. Nathaniel A. Frissell Ph.D.)
----------------------------------------------------------------------
Message: 1
Date: Fri, 1 Oct 2021 16:22:25 +0000
From: "Dr. Nathaniel A. Frissell Ph.D."
<a href="mailto:nathaniel.frissell@scranton.edu" target="_blank" moz-do-not-send="true"><nathaniel.frissell@scranton.edu></a>
To: <a href="mailto:tangerinesdr@lists.tapr.org" target="_blank" moz-do-not-send="true">"tangerinesdr@lists.tapr.org"</a> <a href="mailto:tangerinesdr@lists.tapr.org" target="_blank" moz-do-not-send="true"><tangerinesdr@lists.tapr.org></a>
Subject: [TangerineSDR] FW: [HamSCI] Two questions about the new TAPR
magnetometer board
Message-ID:
<a href="mailto:BLAPR03MB5540044997C2145BB6D46D2AF2AB9@BLAPR03MB5540.namprd03.prod.outlook.com" target="_blank" moz-do-not-send="true"><BLAPR03MB5540044997C2145BB6D46D2AF2AB9@BLAPR03MB5540.namprd03.prod.outlook.com></a>
Content-Type: text/plain; charset="us-ascii"
Hi,
I'm sending these questions from Bill N2RKL to the TangerineSDR list. They were originally posted on the HamSCI list.
73 Nathaniel
From: <a href="mailto:hamsci@googlegroups.com" target="_blank" moz-do-not-send="true">hamsci@googlegroups.com</a> <a href="mailto:hamsci@googlegroups.com" target="_blank" moz-do-not-send="true"><hamsci@googlegroups.com></a> On Behalf Of Bill Owens
Sent: Thursday, September 30, 2021 9:22 AM
To: HamSCI <a href="mailto:hamsci@googlegroups.com" target="_blank" moz-do-not-send="true"><hamsci@googlegroups.com></a>
Subject: [HamSCI] Two questions about the new TAPR magnetometer board
I've listened to the last couple Zoom sessions and also found the layout pictures that Scotty showed a few weeks ago, but I haven't been able to work out answers for two questions:
- How many I2C addresses can be set for the magnetometer and the temperature sensor on each board?
- Are the RM3100 components soldered on the boards, or perhaps on half of them? It looks like there are options for SMT header sockets, and for the components themselves.
Thanks,
Bill N2RKL
--
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