[TangerineSDR] Magnetometer Spec update to V0.3

[Nathaniel Frissell]

Hi Tom,

That is all excellent. Normally, 1 measurement/second is good enough for
geophysical purposes.

73 de Nathaniel

On Thu, Jul 25, 2019 at 1:59 PM Tom McDermott via TangerineSDR <
tangerinesdr at lists.tapr.org> wrote:

> Hi Nathaniel,
>
> The Magnetometer RM3100 User Manual has this note attached to paragraph
> 5.2.1.:
> ----------------------
> Note: The Cycle Count Registers establish the maximum data rate of the
> sensors. For instance,
> if the cycle count is set to 200 D , then the maximum 3-axis update rate
> is ~430 Hz. If TMRC is set
> to 0x92, indicating an update rate of ~600 Hz, the rate established by the
> cycle count will override
> the TMRC request, and the actual update rate will be ~430 Hz.
> -----------------------
>
> For the PSWS application and using the range extenders, we would limit the
> interface to 100 kb/s in
> order to accommodate 30m of cable. In continuous mode, a measurement
> reading takes 10 register
> reads, with overhead that's about 90 bits, lets round up to 100 bits. That
> is 1 millisecond to take
> a measurement.   Thus the Magnetometer IC itself is the rate limit for a
> cycle count of 200, and
> the update rate would be 430 / second.
>
>
> -- Tom, N5EG
>
>
>
> On Thu, Jul 25, 2019 at 9:48 AM Nathaniel Frissell <nafrissell at gmail.com>
> wrote:
>
>> Hi Tom,
>>
>> This magnetometer document looks fine to me, and I think it will work
>> well for our application. I see the that the resolution of this sensor
>> depends on cycle counts, with 200 cycles for 13 nT. It also says the
>> circuit operates at 180 kHz... so, am I correct in saying that could
>> potential make 900 measurements/second?
>>
>> 73 de Nathaniel W2NAF
>>
>> On Wed, Jul 24, 2019 at 3:54 PM Tom McDermott via TangerineSDR <
>> tangerinesdr at lists.tapr.org> wrote:
>>
>>> The magnetometer spec has been updated as a result of the 7/22/2019
>>> TeamSpeak session.
>>>
>>> 1. Power supply is +5V only. I2C logic levels remain 3.3V.
>>> 2. Add new use case for direct connection to local host not involving
>>> Data Engine.
>>>
>>> Attached PDF.
>>>
>>> -- Tom, N5EG
>>>
>>>
>>> --
>>> TangerineSDR mailing list
>>> TangerineSDR at lists.tapr.org
>>> http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
>>>
>> --
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