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<hellekin>
was I out? Damn, I can't get used to the 'internals' of weechat.
<wpwrak>
hellekin: the traditional questions in this type of situation would be: "where am i ?" "what year is it ?" "what's my name ?"
<hellekin>
wpwrak: I know all this. Weechat, I'm still a bit confused.
<hellekin>
It's supposed (with znc) to keep me everywhere I need to be, but actually it doesn't appear to do so exactly.
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<hellekin>
Here's a "reverse-engineering and security conference" happening in Brussels in January... https://recon.cx/
<hellekin>
DocScrutinizer05: you might want to propose something https://recon.cx/2017/brussels/cfp/ (deadlines Oct. 30 and Nov. 27) Probably a nice place to meet hardware and mobile hackers.
<wpwrak>
DocScrutinizer05: we have two pairs of test points (the things that look like junctions without anything branching from them) on battery +/-, one near the battery, the other above U501. is there a reason for this. or do i let the delete key do what it does best ?
<wpwrak>
(i'm also disentangling and labeling these critters. after all, we may want to use them without the employ of a divining rod.)
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<ravelo>
DocScrutinizer51: ping
<ravelo>
Anyone alive? :)
<ravelo>
...
<hellekin>
ravelo: I'm alive, but not sure how I can help :)
<ravelo>
I am trying to reach Jörg
<hellekin>
me too... He must be busy AFK.
<ravelo>
I hope he will show up soon
<hellekin>
ravelo: did you ping him by email, or does your request require presence?
<wpwrak>
they look pretty redundant to me, but maybe they're on a secret mission that was decided before my time
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<DocScrutinizer05>
redundant
<wpwrak>
and .. gone
<pigeons>
i don't think i got a newsletter. let me check gmail's spam box
<wpwrak>
you may also want to have a look at page 8 (antenna connections), especially the RC filter on the output of U804, U805 (nik left that one unspecified and we never discussed it) and the ANT_DRX tap (not quite sure what that one's supposed to do. nik had an u.fl, so i just added our optional tap/jumper there)
<DocScrutinizer05>
pigeons: news article I guess, we now publish minor news updates without sending email
<DocScrutinizer05>
the RC on output of the RF detectors are according to specs for sample&hold mode
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<DocScrutinizer05>
we also need a comparator there that's waking up CPU when energy_out > energy_in
<pigeons>
cool
<wpwrak>
ah, so that incomplete comparator (just a box, no details) i deleted wasn't something obsolete ...
<DocScrutinizer05>
ANT-DRX is for WWAN MIMO and either needs a second antenna or get dealt with according to P*S8 hardware interface manual
<wpwrak>
would that just be a comparator, or a more complex circuit ?
<DocScrutinizer05>
no, wasn't obsoltete, just the DC-blocker capacitors on input were cruft/nonsense, since we have s&h on outputs of the sensor chips
<DocScrutinizer05>
just a comparator
<DocScrutinizer05>
however ideally one that doesn't need energy or has a shutdown mode
<wpwrak>
(drx) i looked for wisdom in the phs8-e hw guide on what to do if DRX is absent, but it doesn't really say
<DocScrutinizer05>
I think it does
<wpwrak>
pointers welcome. maybe i didn't use the right search term
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<DocScrutinizer05>
on p37 PLS8 HID we have footnote 1: By delivery default the UMTS/LTE Rx diversity/MIMO antenna is configured as available for the module since its usage is mandatory for LTE. Please refer to [1] for details on how to configure antenna settings.
<wpwrak>
no enable, but quiescent current than many others would have for input leakage :)
<DocScrutinizer05>
yeah, looks good on first glance
<wpwrak>
(pls8 hd) interesting. it`s in the ~a revision but not i the ~c revision of the document
<DocScrutinizer05>
(ANT_DRX) the idea been to abuse the FM-TX antenna which in turn we'd connect to dunno, something else or in parallel
<DocScrutinizer05>
yeah, Nikolaus had a chat with Gemalto about this IIRC
<DocScrutinizer05>
anyway it's RX aiui, so whatever we do to it, it can't have such a massive impact to our design
<DocScrutinizer05>
(comparator) the "trick" is to give it a slight negative bias so it won't 2float" around triggering point when both sensor chips detect "zilch"
<DocScrutinizer05>
which tbh is a problem since those sensors have a pretty wide error range on output signal
<DocScrutinizer05>
that's why I suggested the DC buffer caps, the idea been to only sense the relative signal edge delta
<DocScrutinizer05>
so the whole thing is sort of a evaluation circuit to see if we could implement it in hw or need to do it in sw
<DocScrutinizer05>
suggestions for smarter circuitry welcome
<DocScrutinizer05>
tbh I'd *love* to have a chip with programmable threshold on analog comparators here ;-)
<DocScrutinizer05>
such chip actually maybe also could do the PWM for the two sensors to reduce their power consumption
<DocScrutinizer05>
so we don't need to do that in sw / cpu-pwm hw
<wpwrak>
it has a little hysteresis
<DocScrutinizer05>
read the sensor chip DS, they have *huge* error DC bias on output
<DocScrutinizer05>
and I'm not sure if we may assume they come "paired"
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<wpwrak>
you mean dVout,min = +/- 20 mV ?
<wpwrak>
alas, much more than the comparator's hysteresis of 17 mV
<DocScrutinizer05>
a chip that could do mixed signal that has some comparators, and would talk I2C, a dream for this usecase
<DocScrutinizer05>
;-)
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<DocScrutinizer05>
(dVout,min) not sure, probably rather the conversion multiplier
<DocScrutinizer05>
it's a while since I looked into it
<wpwrak>
DocScrutinizer05: (dream chip) sounds like silego or kl16 ;-)
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<wpwrak>
the kinetis (kl16 et al) have a programmable hysteresis, but that only goes up to about 35 mV
<DocScrutinizer05>
if only silego would offer I2C in circuit programmability
<DocScrutinizer05>
;-
<DocScrutinizer05>
)
<wpwrak>
it gets close enough :)
<DocScrutinizer05>
and a D/A for setting a reference voltage externally
<wpwrak>
btw, silego also has programmable hysteresis, going up to ~200 mV
<wpwrak>
we have several rather bored comparators in the IR silego
<wpwrak>
.. which happens to be on the same board (LOWER) as the modem
* wpwrak
deletes that new comparator chip and connects the stuff to silego
<DocScrutinizer05>
I'd prefer a dedicated chip for this, since a) avoids possible RF/IR interference, and b) the RF solego might get pretty busy in the end
<wpwrak>
dedicated silego ?
<DocScrutinizer05>
SILicon LEGO
<DocScrutinizer05>
yep
<wpwrak>
they'll love us. that's already #3 ;-)
<DocScrutinizer05>
I know ;-)
<wpwrak>
and it's also cheaper than the single comparator, win-win
<DocScrutinizer05>
*maybe* we can even do A/D with it
<wpwrak>
as long as you don't need more than two bits ...
<DocScrutinizer05>
for sure we could, if the external reference on INV CMP_in was by D/A and buffer cap
<wpwrak>
... or want to experiment with slopes ...
<DocScrutinizer05>
I'll come up with a design shortly
<DocScrutinizer05>
I2C / GP5 wasn't available in SiLego when I designed that SVWR / comparator stuff
<DocScrutinizer05>
12 648 430
<DocScrutinizer05>
the high level design goal being: PWM-dutycycle the LMV221 (S&H mode), compare forward to return energy on antenna, have an option to A/D both, have a generic way to IRQ the CPU on certain conditions, usually when (after calibration) forward energy > return energy
<DocScrutinizer05>
calibration of all trigger levels
<DocScrutinizer05>
very nice-to-have: trigger IRQ on rising edge on either Pfwd or Prev, with adjustable threshold
<wpwrak>
hmm. you said "no" when i asked about "a more complex circuit" :)
<DocScrutinizer05>
sorry, can't recall. Maybe a misconception
<DocScrutinizer05>
or I changed my mind since then - this also rarely but happens
<wpwrak>
or everything < OMAP is "trivial" ;-)
<DocScrutinizer05>
iirc you asked about an external supervision CPU doing complex own monitoring and heuristics. won't fly
<DocScrutinizer05>
what we need here is a smart mixed signal RF comparator
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<DocScrutinizer05>
J801 != GNSS
<wpwrak>
you passed the awakeness test ;-)
<DocScrutinizer05>
not yet :-)
<DocScrutinizer05>
is that note about "the RC filter should..." by you and new?
<DocScrutinizer05>
the LMV221 has S&H mode
<DocScrutinizer05>
which isn't clear and thus misleading by that remark
<wpwrak>
yes, the RC filter stuff is new. i just used the terminology from the data sheet.
<DocScrutinizer05>
aah OK
<wpwrak>
hmm, bad news: the programmable hysteresis is only for comparing one input with internal reference voltage, not for comparing two inputs :(
<DocScrutinizer05>
yes, but that's not bad when we control the external reference anyway
<DocScrutinizer05>
actually hysteresis isn't our concern here. Bias is
<DocScrutinizer05>
we need a comparator that's 'precise' enough to discern an outbound RF signal to an antenna with (per spec) >12dB return loss from an inbound signal to a modem ANT pin with (per datasheet) >9dB return loss
<DocScrutinizer05>
question mark on the latter, not passing awake-text yet
<DocScrutinizer05>
>=8dB
<DocScrutinizer05>
or (in idle) >=5dB
<DocScrutinizer05>
that's still a comfortable 12+5 = 17dm margin for our comparator to tell apart inbound RF (nearby other transmitter) from RF generated aka sent by the modem
<DocScrutinizer05>
17dB even
<DocScrutinizer05>
please don't dive into the details of the comparator design right now, I'll provide a circuit
<DocScrutinizer05>
wpwrak: ^^^
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<wpwrak>
sure. i need a break anyway. having started the day with an hour of explosive sneezing is beginning to catch up with me ...
<DocScrutinizer05>
ouch! I know that from back when I been 14 years old
<ravelo>
I thought these problems only exist in middle europe
<ravelo>
...
<wpwrak>
ravelo: i used to get along with the pollen here, but that changed a few years ago. i guess they've evolved weaponization
<DocScrutinizer05>
or you imported Ambrosia
<DocScrutinizer05>
(you = Argentina)
<wpwrak>
a mythical drink "depicted as conferring longevity or immortality upon whoever consumed" ? hmm. didn't think of these reactions quite like that ;-)
<DocScrutinizer05>
>>...haben herausgefunden, dass sich die allergischen Reaktionen des Beifußblättrigen Traubenkrauts verstärken, wenn sie mit Stickstoffdioxid in Verbindung treten<< This applies to a lot of alergene pollen
<DocScrutinizer05>
this or similar
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<DocScrutinizer05>
wpwrak: did you ever have your allergy status tested?
<DocScrutinizer05>
knowing exactly what you're allergic to is the first step to cope with it
<DocScrutinizer05>
a tip from my experience (obviously unknown to medical doctors): the skin pierce allergen test might give false negatives for allergens that you're already massively exposed to, since the amount applied is << the amount you have to deal with every day
<DocScrutinizer05>
so ideally do such test when you're not suffering active allergy
<DocScrutinizer05>
during local winter time
<DocScrutinizer05>
obviously also don't do this test during cetiricine et al medication ;-)
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