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Forum Index : Microcontroller and PC projects : MX174

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robert.rozee
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Joined: 31/12/2012
Location: New Zealand
Posts: 2282
Posted: 07:38pm 18 May 2017
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MX170 upgraded to 72MHz, 12k boot flash (upped from 3k). the MX175 (according to the datasheet) has a Vbat pin. there are also MX274/5 versions.

http://www.microchip.com/wwwproducts/en/PIC32MX174F256B

operating current is 1.7mA at 4MHz, 29mA at 72MHz, 100uA at 31KHz (LPRC oscillator).

looks like only available in SOIC, QFN and TQFP.


cheers,
rob :-)
 
Grogster

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Location: New Zealand
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Posted: 07:56pm 18 May 2017
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Rob - are you thinking what I am thinking? (E28?)
Assuming that porting to this chip was possible and easy enough....
Smoke makes things work. When the smoke gets out, it stops!
 
robert.rozee
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Location: New Zealand
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Posted: 08:19pm 18 May 2017
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yep assuming it just requires a re-compile. one could either have a speed boost, or return to optimizing for reduced code size to fit more in without any performance hit. either way, there would also be that extra 9k of flash to play with.

looks like there are samples available, if geoff indicates it is just a recompile then i'll order some. is a shame an SPDIP version isn't available, but then maybe one will come along later on.


cheers,
rob :-)
 
Quazee137

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Joined: 07/08/2016
Location: United States
Posts: 514
Posted: 09:53pm 18 May 2017
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Looks like the 170 and 174 pins are the same just no DIP.
To get a lot more flash is great. I am going to order a
few and see if the work as is with MMBasic on the
breadboard with a soic to dip.


2017-05-19_075504_170.pdf


2017-05-19_075524_174.pdf Edited by Quazee137 2017-05-20
 
Grogster

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Posted: 10:56pm 18 May 2017
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I wonder if the new die for the 174 is just physically too wide to fit inside the PDIP package? I would have said yes, but then they have a QFN version, which would suggest that it is small enough for PDIP.

As Rob says, they may well offer that in due course if this is a new release chip.
Microchip are fantastic in that they offer all their chips in so many different packages.
Smoke makes things work. When the smoke gets out, it stops!
 
lizby
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Joined: 17/05/2016
Location: United States
Posts: 2989
Posted: 03:01am 19 May 2017
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Is this enough additional flash, and in the right place if things are shuffled around, for matherp's sd file system improvements to fit (Geoff said it was too tight for the MX170)?

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed
 
CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 1983
Posted: 03:31am 19 May 2017
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+1
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3163
Posted: 04:44am 19 May 2017
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From reading the notes I doubt that a simple recompile will work with this chip.

On the plus side the speed increase and lower power draw are great. So are features like two SPI ports. On the negative is the package choice. More boot flash is nice but it will not make a huge difference and it is nowhere near enough to implement SD card support.

The big pity is that there is no PDIP package and I doubt that there ever will be one. One of the reasons that the 28-pin MM is so popular is the easy to use package. Of all the boards and projects that use the Micromite only a very few use the SOIC package - so for most people a new version that will only run on the MX174 will render their current design obsolete.

There could be multiple versions of the Micromite (MX170, MX174, MX470, etc) but this is a hard ask as supporting multiple chips takes a lot of work - MMBasic is not like Windows, it needs to be customised to each chip. Creating multiple versions is also not sustainable as more and more chips will be released in the future, each with subtle upgrades.

My current plan is to get some samples and see how hard or easy it is to port MMBasic to it. With a bit of luck we could have just one hex file which will autoconfigure between the MX170 and MX174 as the current version does for 28 and 44-pin chips.

Geoff
Geoff Graham - http://geoffg.net
 
CaptainBoing

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Joined: 07/09/2016
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Posted: 01:40pm 03 Jan 2020
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Hello Geoff - happy 2020

did you ever get your samples of the 174? I would be interested to know what were your findings.

I was just bemoaning the difficulty of some tasks on a 48MHz 170 and a little bell went off in my head for this tenuous 72MHz "upgrade".

jus' wonderin'

cheers

h
Edited 2020-01-04 00:10 by CaptainBoing
 
Tinine
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Joined: 30/03/2016
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Posts: 1646
Posted: 04:12pm 05 Jan 2020
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First I've heard. Didn't pick up on the 2017 origin.

This would be
 
Geoffg

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Posted: 11:05pm 05 Jan 2020
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I did get the samples and unfortunately it was not a case of a simple recompile - the chip has some significant differences from the MX170.

It would be possible to port MMBasic to the MX174 but as I said in my post back in 2017 it is not worth having yet another version of MMBasic to support when there is no PDIP package.

Geoff
Geoff Graham - http://geoffg.net
 
CaptainBoing

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Posted: 07:03am 06 Jan 2020
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OK, it was a long shot - thanks anyway

cheers
 
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