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- Triple Axis Accelerometer - ADXL345
The ADXL345 is a small, thin, low power, three-axis MEMS accelerometer with high resolution (13-bit) measurement up to ±16g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface.
The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4mg/LSB) enables resolution of inclination changes of as little as 0.25°.
Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion and if the acceleration on any axis exceeds a user-set level. Tap sensing detects single and double taps. Free-Fall sensing detects if the device is falling. These functions can be mapped to interrupt output pins. An integrated 32 level FIFO can be used to store data to minimize host processor intervention.
Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.
- 1.8V to 3.6V supply
- Low Power: 25 to 130uA @ 2.5V
- SPI and I2C interfaces
- Up to 13bit resolution at +/-16g
- Tap/Double Tap detection
- Activity/Inactivity monitoring
- Free-Fall detection
- 3 x 5 x 1mm LGA
Triple Axis Accelerometer - ADXL345 Product Help and Resources
Core Skill: Soldering
This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.
Skill Level: Competent - You will encounter surface mount components and basic SMD soldering techniques are required.
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Core Skill: Programming
If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.
Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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Core Skill: Electrical Prototyping
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Customer Reviews
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The pictures with the rulers are incorrect. The package dimensions are 3x5x1mm. 5mm is half a centimeter and the pictures show the chip being way smaller than that!
yes the pictures shows the chip being about 2.5mm or to put it in centimeter 0.25, or 0.0025m.
and Device Weight is 20 mg or 0.02g or 0.00002 kg or around 0.000044 lbs.
but this is a very new chip, if you look at Analog Devices site Production Availability is 04/24/2009.
and it is the only Digital Analog Devices three-axis accelerometer with a bw of 1.6Khz
Wow, way to be a jerk about your reply. I was merely stating the fact that 5mm is half a centimeter. I was trying to imply that as a sanity check, whoever is making these pictures could look at the ruler and verify it's in the ballpark. They're obviously having problems with their process because this happens a lot with new chips.
sorry sorry sorry.
I didn't mean to be a jerk.
I was really glad that you said something I almost used that pictures to show my boss how small it is.
And I am impressed that sparkfun is already selling this chip.
but I didn't mean to come off as a jerk.
I think I need to get some for this chips and go make a Jerk-meter so I can avoid coming of as a jerk again.
(just to explain that last part was a physics joke, jerk being the 3th derivative of position (the change of acceleration) and one of the thing that one can measure with this chip)
I'm sorry too. I was having a bad day and I took your post the wrong way. It seemed you were mocking my observation, but you were just being funny. That's the problem with these darn internets... you can't see people's facial expressions or hear their tone of voice, which is what people rely on for message context. :)
Anyway, I'm an EE so I totally got the "Jerk-meter" joke. That's the funniest thing I've heard all day! Unfortunately, I don't think they will actually be selling this part for a while. I think Sparkfun just put this page here to generate interest. Analog.com shows it going into production at the end of August. However, they do show one of the packages being produced by the end of April. We shall see...
Again, sorry about being a jerk by calling you a jerk. I should make one of those jerk meters too and use it on myself. Then, I could also use it to find my favorite cereal characters Snap, Crackle, and Pop! (http://en.wikipedia.org/wiki/Jounce)
Wow. This is a major moment for comment boxes. Two kind people had a polite disagreement, settled it without the use of profanity, and even shared an EE joke. Friends, I hope you raise your hats and salute to these gentlemen.
What is up with Bildr? To register, they require a question answer that I'll bet most people don't know off the top of their heads. I looked it up in Wiki. When I returned to their registration site, I was told that I had attempted to register too many times and had to wait. I waited 15 mins, and they still won't accept my registration. Not only that their is no "contact" service, so I can't ask them for help. Apparently, they don't want members. SO, will you please drop them and find some other place to put tutorials?
Sorry to hear you had such a rough experience with Bildr's site. As far as their registration process, I can't speak to that, so you might want to try emailing their support team. However, you should be able to view any tutorials we have linked on their site without registering. Also, we are working on getting more tutorials up on our new education site, so I would definitely recommend checking that out.
I just finished a rich, interactive register map on the I2Cdevlib project device page for the ADXL345 here:
http://www.i2cdevlib.com/devices/adxl345
My goal is to provide an easy, intuitive reference for working with this and other devices, and ultimately to make it easy to port (or generate) device control code across multiple platforms. Right now there is Arduino library and example code, but others are not far away.
The supply voltage and power specs listed are wrong. 2V to 3.6V supply, 40uA to 145uA @ 2.5V. The specs listed on the breakout board are correct.
Are the pads only on the bottom of the ic or do they also extend to the sides (so that they are solderable by hand)?
The pads are NOT visible from the side of the chip (the metal is purely on the bottom)... but if your pads are big enough you can still solder it together indirectly with some luck (use solder paste + small tip)
heheheh your both jerks!! nah just kidding... its a nerd fight... did you bring your calipers?
yah this is a good case of always using your dial calipers to double check things, open it up to 5 mm or whatever and stare at it and go "wow thats small....".
yah its gonna be a great chip!
cant wait to see some IMU;s with it!!
if sparkfun beats the silicon horizon to an IMU with it, then we might not make one at all hahahah :)
well see how good yours is.
if it sucks then well build it right then make fun of you guys.
hahahaha
nah u guys are ok in my book. maybe ill come work for you later on.
take care,
-drex
Any chance we might see a carrier board for this device?