Saturday, June 25, 2011

Check out the Update: MMA8453Q Accelerometer Breakout - Update

Well we have been busy all this time so you see not much of blog activity. However our pursuit on creativity continues.
We were trying out the Freescale's new Accelerometer MMA8453Q which we procured recently.
The problem with this chip was that it was a QFN-16 package and so tiny that we did not believe it could be soldered in any way even if we get a PCB done.
So, so... This was a job for the Wiring Pen we described earlier.

We first soldered the Chip to a piece of veroboard using FeviQuik (conventional Cyanoacrylate adhesive).
Picture of the Chip glued on to the veroboard
Bottom view of the chip showing pin descriptions

Then we did the fine art work of wires using the Wiring Pen and made a breakout.

Breakout pin configuration
We have tested this out and its working!!

As requested here are steps that can help you build your own QFN breakout:
[1] Invert the chip and fix it onto a small piece of Vero board as shown in the First Picture above.
You can use the Cynoacrilate Adhesives (like Fevi-quick we have in Bharat) for this purpose.
But be careful they are extremely poisonous and you can hurt your self it fall any where other than desired.
[2] Identify the Pin 1 location and the desired pin configuration as shown in the Bottom View picture of the chip. Then map it to the desired breakout you would like to have as showing the Breakout Pin configuration picture above.
[3] Solder the Berg pins carefully in the breakout positions as decide in the mapping.
[4] Apply the No-Clean flux on the bottom of the chip and the pins.
[5] Take the Wiring Pen and tin the tip of the wire with fresh solder uncovering the insulation. The length of the uncovered insulation to be as small as possible.
[6] Carefully take a minute ball of solder on the soldering Iron tip and attach this wire to the pin
[7] Next measure the distance to the Berg pin by taking the Wiring Pen near to it so that the wire automatically unrolls. Now cut the wire to be soldered on the berg pin.
[8] Tin this end of the Wire which we just obtained using fresh solder and then fix it the berg pin soldered point by applying the soldering iron and inserting the wire into the solder. This makes your first pin ready.
[9] Using a pain of Pins as probes measure the continuity for this connection in the multi-meter. It should be as low possible but dont press the pins hard else they might damage the joints.
[10] Not continue the steps from step [4] for all the pins you need to take out.
[11] Once done clean the entire thing in a small bath of IsopropileAlcohol to ward off all the unwanted flux or the resin residue from the solder wire.

Thats all for the process.
Thanks for your interest. Let us know your feedback in case you would like a Video demonstration.

Check out the Update: MMA8453Q Accelerometer Breakout - Update

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