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JWoodrell

MSP430G2955 to valueline DIP20 adapter

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Ii whipped up an adapter to be able to take a G2955 and plug it into a valueline layout DIP20 setup, so it can be a drop in replacement for existing dip20 projects, but take advantage of the larger capability of the G2955.  I extended it out into more of a DIP38 package, but you don't have to put headers on the extended layout and use them only as breakout pins on the board.

 

I am sending them off to elecrow in blue boards.

 

I am going to be building mine with flat pins so it can plug into the dip20 sockets, cause those don't like accepting the square "header" pins

 

[edit] attached the latest files  to the last post[/edit]

post-7036-0-00822400-1364588411_thumb.jpg

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 am going to be building mine with flat pins so it can plug into the dip20 sockets, cause those don't like accepting the square "header" pins

I was just thinking that you'd have trouble getting that SMD chip over the top of those PTH pins - are the "flat" pins going to help that?.

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when using square pin headers (standard headers) the 5 pins that are under the tssop will be cut shorter so they don't extend above the top of the board, but they will still be soldered on the bottom, and in the barrel so they'll be solid,

 

the flat pins will be a dip20 socket (with the flat DIP legs) with a shaved head soldered SMD style to the bottom of the board, so it won't affect the TSSOP

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Pretty cool! I like the backward compatibility to the 20 pin.

However I think it's necessary to connect AVDD too since it sources more stuff than just the ADC.

Maybe having an 0R connecting it to DVDD.

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Right it's not mentioned in the DS but you can see it in the users guide page 44. Connection of unused pins.

http://www.ti.com/litv/pdf/slau144i

I know it should be connected, but nothing explains clearly what the AVCC would power. The Family guide shows the AVCC is only used for the ADC (and Sigma Delta ADC), the Supply Voltage Supervisor, and the OpAmp. The latter two arn't implemented in the valueline at all.

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I added 2 0402 resistors 0 ohm to tie the AVCC and AVSS to their D cousins, so it'll be easy to split apart if needed in the future. They're being sent off now.

 

this is how it all fits together (mocked up with a correctly sized section of the 0.6mm thick board from Elecrow) on a launchpad itself

 

it clears the jumpers, easily, and there is still a gap around 0.75mm above the top of the tssop beneath a standard height boosterpack.

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post-7036-0-36995400-1364596079_thumb.jpg

post-7036-0-80006700-1364597607_thumb.jpg

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you can use a separated supply for the analog to digital comparators. in msp430fr you can use AVCC to read 5V analog inputs. here i don't realy know... i think it only maters if you use msp430 with like 1.8V and you need to read 3.3V (4v max i belive) analog inputs

 

 

pretty nice board. still i want to stick with a tssop38 to 38PDIP to have all the I/O :P

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all 38 pins are broken out, so you have all the I/O available, I just rearranged the front 20 pins so that it matched the old value line PDIP 20 layout.  you can easily install headers along the whole 19 pins along each side and have a thin package PDIP 38

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no the b is just the panelized version with 3 on a 5cm board.  the brd and sch are the single board.

 

[edit] hehe that was my mistake, i fixed the file above so its the non b version on sch and brd[/edit]

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