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<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:part1.DBDA5499.D63A7374@fairpoint.net" alt=""><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 class="moz-cite-prefix">On 10/2/2021 11:36 PM, Bill Owens
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANVSWVjWbM3ix65iciHpRSy_s6WWrpz-vmHXao=e_kKkbwpXUA@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 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"
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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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:
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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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