Overview
The ADXL345 is a small, thin, low power, 3-axis accelerometer with high
resolution (13-bit) measurement at up to ±16 g. 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 (4 mg/LSB)
enables measurement of inclination changes less than 1.0°. 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 one of two
interrupt output pins. An integrated, patent pending 32-level first in, first
out (FIFO) buffer 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.
Features:
- Ultralow power: as low as 40 μA in measurement mode and μA in standby mode at VS = 2.5 V (typical)
- Power consumption scales automatically with bandwidth User-selectable resolution
- Fixed 10-bit resolution
- Full resolution, where resolution increases with g range, up to 13-bit resolution at ±16 g maintaining 4 mg/LSB scale factor in all g ranges)
- Embedded, patent pending FIFO technology minimizes host processor load Tap/double tap detection
- Activity/inactivity monitoring
- Free-fall detection
- Supply voltage range: 2.0 V to 3.6 V
- I/O voltage range: 1.7 V to VS
- SPI (3- and 4-wire) and I2C digital interfaces
- Flexible interrupt modes mappable to either interrupt pin
- Measurement ranges selectable via serial command
- Bandwidth selectable via serial command
- Wide temperature range (−40°C to +85°C)
- 10,000 g shock survival
- Pb free/RoHS compliant
For Design & Code Click here
