Hi,

i worked with ADIS16488 inertial sensor...

about **DELTA ANGLES** parameter in datasheet: **±720° range, 0° = 0x0000, 1 LSB = 720°/2^15 = ~0.022°.**

now i am working on **ADXRS453** gyro and i used same formula to calculating DELTA ANGLES (with specify FS), **but i can't find or calculate weight of 1 LSB to calculate Angle in degree.**

B.R

Pouya

The ADXRS453 does not provide this function through an output data registers, so probably shouldn't expect this to be available in this particular datasheet. Having said that, I will be happy to help you work through this. In the digital realm, integration of rate information is simply a summation of the gyroscope measurement, multiplied by the sample time. You can use the same formulas from the ADIS16488 datasheet, which in effect, average the current angular sample with the last angular rate sample, to estimate the change in angle over that one sample period. I like to draw this type of stuff out, as it helps me think through what is going on, with better clarity. Here is what I drew out on my board for you. This is purposely generic, but should enable us to figure out what the scale factor will be for the resulting angles.

(More below picture)

Using the RATE scale factor (1 deg/sec per 80 LSB) and the nominal update rate of the ADXRS453 (1/485), you can estimate the scale factor for your delta angle computation in the following way:

(1 deg/sec / 80 LSB) x (1 sec/485 samples) = 0.00002577 deg/LSB

Keep in mind that this does assume that you read every data sample from the ADRS453. Hope that this helps!