[Ovmsdev] OVMS v3.3 hardware

[Mark Webb-Johnson]

The board numbering we have used is:

v3.0 (modem 1.0): initial prototype development version, never wen’t to full production
v3.1 (modem 1.1): first production version
v3.2 (modem 1.2): production version with CE, FCC and ROHS certification. Changes from v3.2 were to add extra components to pass EMC and other such tests (no change to core functions).

The upcoming v3.3 will have some minor hardware fixes and include a v3.3 modem board supporting SIM7600. Going forward we will try to keep the modem and main board revision numbers the same. The old v1.1/v1.2 modem boards can also be used with this v3.3 main board, and the new v3.3 modem board will be able to be used with old v3.1 and v3.2 main boards.

> Is it too soon to add the v3.3 and v1.3 pdfs to the source tree?)

Yes, we haven’t finalised those, or gone through certification yet. We’ll release the v3.3 main board and modem layouts and schematics when that is complete (probably November/December timeframe).

> > 2. Any chance to fix the missing HW flow control on the modem UART
> > connection?
> 
> (Is this the source of the "W (541151) cellular: UART hw fifo overflow" I see periodically?)

Probably.

Regards, Mark.

> On 7 Sep 2021, at 7:13 AM, Craig Leres <leres at xse.com> wrote:
> 
> On 8/29/21 11:03 PM, Mark Webb-Johnson wrote:
>> I now have two prototypes of the 4G modem using SIM7600G R2 chip for OVMS v3.
> 
> I was comparing the v1.1 and v1.2 modem schematics to see what the differences are between my sim7600 converted board (v1.1) and the current production version. It looks like some inductors and related parts were added to the power supply (and I sort of remember you describing this back when the v3.2 ovms board came out).
> 
> I noticed the pdf files for the v1.2 modems are misnamed in the source tree:
> 
>    ice 521 % find . -name '*.pdf' | fgrep -i modem
>    ./hardware/v3.1/Modem_PCB_v1.1_20180305.pdf
>    ./hardware/v3.1/Modem_SCH_v1.1_20180305.pdf
>    ./hardware/v3.2/Modem_PCB_v3.2_20190610.pdf
>    ./hardware/v3.2/Modem_SCH_v3.2_20190610.pdf
> 
> Shouldn't the ones in the v3.2 directory be named *v1.2_20190610.pdf?
> 
> Aside from the R8/R9 to R6/R6 and u.fl component swap, are there other differences between the v1.2 and v1.3 modem boards? (Is it too soon to add the v3.3 and v1.3 pdfs to the source tree?)
> 
> On 8/17/21 12:31 AM, Michael Balzer wrote:
> > 2. Any chance to fix the missing HW flow control on the modem UART
> > connection?
> 
> (Is this the source of the "W (541151) cellular: UART hw fifo overflow" I see periodically?)
> 
> 		Craig

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