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How do you program non DIP pics?

 
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grasspuddle



Joined: 15 Jun 2006
Posts: 66

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How do you program non DIP pics?
PostPosted: Thu May 24, 2007 1:34 pm     Reply with quote

Simple question with a (hopefully) simple answer:

If I were to use SMD devices and switch from a 40pin DIP 18f452 to a 44pin TQFP, how would I program anything to it?

Any experiences on this would be very helpful.
kevcon



Joined: 21 Feb 2007
Posts: 142
Location: Michigan, USA

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PostPosted: Thu May 24, 2007 1:43 pm     Reply with quote

Using microchip's ICD2 or CCS's ICD

I use an ICD2 for programming a 18F65J10 TQFP and it works great.
tojape



Joined: 14 Jan 2007
Posts: 20
Location: Hungary

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PostPosted: Thu May 24, 2007 1:53 pm     Reply with quote

The simpliest way to program nonDIP processors to place a 5 or 4 pin connector on the pcb. Usually you have to make available the inCircuit programming pins, (eg. PGC,PGD plus MCLR,Vcc, GND.)
If you use a standard programmer it usually won't be sufficient to supply the whole circuit
Instead, the board should use its own power supply.
You can simply make a cable with the pcb connector on the one end and a dip socket soldered to the other end, assigning pcb connector pins to the corresponding dip pins.
Bye,
tojape
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Guest








PostPosted: Fri May 25, 2007 7:59 am     Reply with quote

I use the microengineeringlabs (melabs) USB programmer & can recommend it. It takes the form of a board with the programmer hardware & a header connector.
You can make your own in-circuit programming cable to mate the header to your own board. melabs also do a range of DIP & SMT package interfaces which are essentially the programming socket on a PCB mated to the matching header connector. You can then use the programmer alone for in-circuit use and/or buy a selection of the appropriate socket interface boards for bare device programming.
SherpaDoug



Joined: 07 Sep 2003
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PostPosted: Fri May 25, 2007 8:52 am     Reply with quote

There are adapters such as these:
http://www.dataman.com/WebPages/Adapters/AdapterList.aspx?PC=Dataman+40Pro&AC=GP
But they are expensive $$$
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mskala



Joined: 06 Mar 2007
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PostPosted: Fri May 25, 2007 10:49 am     Reply with quote

You don't really need a connector at all.

I use the MElabs programmer. If you have a diode to prevent trying to power the whole circuit board (or to protect 3.3V chips from 5V from programmer), you can place a .1" 5-pin header footprint on the board, unpopulated, and just adapt the programmer's pins to a flex cable with .1" pins. Place into the holes and apply slight side pressure while programming.

I've done hundreds of boards like this and never a problem.
grasspuddle



Joined: 15 Jun 2006
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PostPosted: Fri May 25, 2007 11:23 am     Reply with quote

I'll definately try melabs programmer. Serial/USB programmer with a 44pin TQFP for the 18f452 pic. I only need to program it once for the bootloader, then update it through a serial port like I usually do.

~200$ total

Thanks for the info!
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Fri May 25, 2007 11:45 am     Reply with quote

In the past, I've used ZIF sockets for the surface mount device and mounted it on an UV erasable eprom. I, first, drilled out the window and made sure all of the wires were disconnected. Then, I soldered wires from the ZIF to the eprom leads. It can look like a mess but it works and is much cheeper than the pre-made adapters.

Ronald
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