According to this source, the iphone has a LSI302DL sensor. Here some specs data about that sensor.
- Technology MEMs (suspended silicon structures )
- +/- 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.
Blocks diagram
basic electrical wiring
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