Monday, March 8, 2010

Iphone’s accelerometer

Here the first findings about the iphone’s accelerometer.
According to this source, the iphone has a LSI302DL sensor. Here some specs data about that sensor.

  • Technology MEMs (suspended silicon structures )image
  • +/- 2g/+-8g dynamically selectable full scale.
  • Digital output  interface I2C/SPI
  • Embedded high pass filter
  • Embedded self test
  • <1mW power consumption
  • 2.16V to 3.6V supply voltage
  • Sampling rate selectable 100Hz or 400Hz.
  • Sensitivity 18mg/digit for +/-2g and 72mg/digit for (+/-8g)
  • It is not clearly stated in the data sheet but it seems the ADC is 8 bits. The signals are multiplexed before enter to the ADC.
The data sheet of this IC can also be downloaded from my site
 image
Blocks diagram
 image
basic electrical wiring

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