SparkFun Forums

[sparky]

Just wanted to post a note about the new Analog Devices ADXL320 +/-5g accelerometer.

Breakout boards are available here: http://www.sparkfun.com/shop/index.php?shop=1&cat=71

This is a fantastic little device that will quickly replace the ADXL311. Expect many new consumer electronic devices to 'know' when you've picked them up.

-Nathan

[Guest]

The acselerometer looks like a great chip how about a control systems tutorial?

[Tyler]

I am replacing a ADXL250 that isn't working well in my system, and has been discontinued anyway. I am planing on ordering the analog devices breakout board, and the freescale board to compare them. I would like to get the ADXL in the ±5g and ±2g versions.

It looks like the breakout board can be ordered assembled with either the 320 or the 321. How about the ±2g ADXL322?

What case size are the capacitors in case I order the bare PCB, and get the 322 elsewhere?

Does anyone know when the 3 axis Analog Devices part (ADXL330) is going to be available?

Sorry if I'm asking too many questions at once.

[sparky]

You can never ask too many questions

We've got breakout boards for the ADXL320, 321, and 322.

We are on the list for samples of the 330 but I don't expect we will see eng samples until Q2 of 06. It's way, way out there.

The board pictured is now retired in place of much easier to assemble breakout boards on the SFE site found here: http://www.sparkfun.com/shop/index.php? ... itemid=290

We actually used to assemble those Tiny boards . Silly Spark Fun.

-Nathan

[Tyler]

How do you mount the thing? The leads are all under the edge of the IC, and there appears to be an exposed pad on the underside of the part that the data sheet does not call out. What is it supposed to connect to?

I was thinking of extending the pads on the PCB out from under the part, and then using them to reflow solder to the pins. But what about the large pad that is completely under the part?

I got two of the development boards and I had to reflow one of them using a heat gun because it wasn't soldered down completely.

Should I just resign myself to sending this assembly out to a pick and place shop?

[sparky]

Ahh comon! It's not that bad!

We rework CP210xs and ADXLxs all the time! Just get a rework station with a good soldering iron. Practice, and you'll have it in no time.

-Nathan

[leon_heller]

How do you mount the thing? The leads are all under the edge of the IC, and there appears to be an exposed pad on the underside of the part that the data sheet does not call out. What is it supposed to connect to?

I was thinking of extending the pads on the PCB out from under the part, and then using them to reflow solder to the pins. But what about the large pad that is completely under the part?

I got two of the development boards and I had to reflow one of them using a heat gun because it wasn't soldered down completely.

Should I just resign myself to sending this assembly out to a pick and place shop?

The pad should probably be connected to ground. An easy way to connect it is to have a grounded copper area on top of the board, under the chip, and put a via in it. You can then feed solder into the via from the underside of the board whilst heating it with a soldering iron tip. A large via might help.

Leon

[perryrowe]

If I want to use this board , is it necessery to use another opamp before ADC?

[leon_heller]

How do you mount the thing? The leads are all under the edge of the IC, and there appears to be an exposed pad on the underside of the part that the data sheet does not call out. What is it supposed to connect to?

I was thinking of extending the pads on the PCB out from under the part, and then using them to reflow solder to the pins. But what about the large pad that is completely under the part?

I got two of the development boards and I had to reflow one of them using a heat gun because it wasn't soldered down completely.

Should I just resign myself to sending this assembly out to a pick and place shop?

The pad should probably be connected to ground. An easy way to connect it is to have a grounded copper area on top of the board, under the chip, and put a via in it. You can then feed solder into the via from the underside of the board whilst heating it with a soldering iron tip. A large via might help.

Leon

That's how I do it, with a 1 mm via.

Leon

[leon_heller]

If I want to use this board , is it necessery to use another opamp before ADC?

It should have enough output not to need it. I am using the Freescale three-axis accelerometers (analogue output) with an MSP430, and there is plenty of output for the ADC.

Leon

[Philba]

check the impedence of the output. some older ADXLs were much too high for direct ADC input but the newer ones seem to be interface-friendly.

[ak1394]

Are you going to stock ADIS16100/ADIS16003 when they become available?