[time-nuts] Ublox Neo M8T no output on TP2 question please?

[Chris Wilson]

Hello Time Nuts,

 Tuesday, January 22, 2019

 The Ublox M8T is now fixed! For future reference this is what was
 wrong. CSG Shop ship various versions of this GPS module on a generic
 board, as far as I can tell, and reading between the lines. Some
 versions need this jumper across two of the three normally bare
 solder pads. Mine seems to have "escaped" with a Neo_M8T but the
 jumper soldered in place needed for NEO_M8L and NEO-M8U modules. Upon
 removing it the device now outputs under control of the current
 release of U-Centre software on TP0 and TP2. On another list I have
 been warned to only capacitively couple TP2 to "whatever" in case
 "whatever" pulls TP2 to low, which would put it in Safe Mode. If
 anyone wants a photo of how the pads should be for the M8T I can take
 one and link here. But basically the M8T module should have NO
 jumpers across the three pads on the reverse side of the board...A
 learning experience I could have done without, but at least I have
 learnt something and it can now be cased up :) Thanks to all for help
 here and by direct e-mail.
 


Best regards,
 Chris        mailto:chris at chriswilson.tv


CW> Hello Time Nuts!

CW>  Sunday, January 20, 2019
CW>  Thanks  for all the replies, I am now in e-mail contact with Alexander
CW>  at  the sellers place. He asked last night if there's a jumper on the
CW>  underside  of  the GPS board. At first I thought there was a tiny SMC
CW>  resistor  or capacitor. It was in an area where flux residue existed,
CW>  so  looked  like  a  post manufacture addition. Upon cleaning off the
CW>  residue  I  now think there IS a solder jumper fro pin 1 of the Ublox
CW>  to  somewhere else, maybe to the power supply area. I wonder if pin 1
CW>  is  being held high or low? I am impatiently waiting for Alexander to
CW>  see  the  photo  and  advise, what do you guys think? The photo is at
CW>  http://www.chriswilson.tv/gps.jpg  Up  to now all attempts to get any
CW>  output from pin 1 have failed. Thanks for all the replies again!
CW>  


CW> Best regards,
CW>  Chris        mailto:chris at chriswilson.tv


LB>> I have mislead you about NEO-M8T-0-10 TP 2 capabilities, sorry.
LB>> https://www.u-blox.com/sites/default/files/products/documents/NEO-LEA-M8T_ProductSummary_%28UBX-16000801%29.pdf
LB>> does not differentiate between two outputs and lists range as 0.25Hz-10MHz.

LB>> Regarding flash/no-flash bootleg versions - mask ROM firmware
LB>> residing on the die does not support FTS functions (there is not
LB>> enough space for extra features and increasing the die size would
LB>> increase base product cost) so if you have FTS product then it
LB>> must have flash inside to run the code from. Whether this flash IC
LB>> is of adequate size to accept future updates or whether its
LB>> erasing and writing is supported by the main firmware in ROM is a
LB>> separate question.  It is technically possible to create
LB>> operational but non-upgradeable FTS product .

LB>> Leo
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