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<[email protected]> |
Hi Peter, I would suspect the wall wart as the issue. i seem to recall
somebody else with a similar problem that went away when they replaced
the wall awrt with a well regulated supply.
When I worked with the Telit 865 module I used a boost regulator with an
Li-poly capable of delivering 4A continuous. It wasn't a large battery.
That was for portability though as I didn't want to be tied to a vehicle
supply.
The SBW is the Spy By Wire interface used on a lot of the smaller parts.
I rarely need to go to large parts unless I need lots of I/O, and this
fits in fine.
Al
On 22/02/2015 1:02 PM, 'Peter Grey' [email protected] [msp430] wrote:
>
>
> Hi Al
>
> My difference in Vcc is very small as noted below. But I agree it is
> something between the 2 supplies that is causing the problem, as
> Emmett alluded to. I will try his suggestions and see how it goes.
>
> What is the SBW dongle you refer to in your email?
>
> Thanks
>
> Peter
>
> *From:*[email protected] [mailto:[email protected]]
> *Sent:* Saturday, 21 February 2015 9:55 PM
> *To:* [email protected]
> *Subject:* Re: [msp430] Problems with IAR and programming
>
>
>
> I haven't used a FET board for a while, but I recall thaqt several of
> them used to have this issue if there was a slight difference in Vcc
> levels, very slight. The same doesn't occur with the SBW dongles, they
> live quite happily with joint supplies and a 0.6V differecne in Vcc,
> though I wouldn't recommend this. I can't find my FET documentation at
> the moment, but I seem to recall there was a resistor you could change
> that would allow the FET board to handle this.
>
> Al
>
> On 21/02/2015 3:42 PM, 'Peter Grey' [email protected]
> <mailto:[email protected]> [msp430] wrote:
>
> I have a target board with a MSP430FR5729. I am using IAR EW6.5
> and a MSP430-FETUIF. I have a MSP-TS430PW28 connected to the FET
> module and 4 wires going to my target board (Vcc, ground, Test,
> RST). I have used this sort of setup many times. My target board
> has a 12V input and it generates 11volts to be used on board to
> generate 3.3V and a few other DC voltages. When I connect the
> cable from the PW28 board I can program the board and run it. If I
> connect the 12 volts to my target board the IAR crashes and I have
> to turn my PC off and on. When the 12V is not on the Vcc is 3.32V
> and if I have the 12V connected and no FET the Vcc is 3.29V. I
> cannot see any shorts to ground and the whole target board draws
> 17mA when no high power devices are connected (3G modem). I can
> program in a led flash and this will work with no 12V connected.
> If I remove the FET and apply power the fled will flash. It seems
> the program runs but it will not download the program when I have
> the 12V connected. I checked the notes from TI and can see no
> hints as to what is happening.
>
> Any suggestions?
>
> TIA
>
> Peter
>
>
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>