How do you program non DIP pics?

grasspuddle · Joined: 15 Jun 2006 Posts: 66

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

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

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 · Posted: Fri May 25, 2007 7:59 am

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 Posts: 1640 Location: Cape Cod Mass USA

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 Posts: 100 Location: Massachusetts, USA

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 Posts: 66

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

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