Analog Devices Inc. ADXL312 3 轴加速计
Analog Device ADXL312 3 轴加速计设计为一款小巧纤薄的低功耗三轴加速度计，可对高达 ±12g 的加速度进行 13 位高分辨率测量。 该器件的数字输出数据采用 16 位二进制补码格式。 可通过 3 线或 4 线串行端口接口 (SPI) 或者 I2C 数字接口访问数字输出数据。 该器件可在倾斜检测应用中测量静态重力加速度。 该器件还可以测量运动或冲击导致的动态加速度。 ADXL312 具有 2.9mg/LSB 的高分辨率，能够分辨小到 0.25° 的倾角变化。 集成式 FIFO 有利于使用过采样技术，将倾角分辨率提升至 0.05°。 ADXL312 加速计还提供多种特殊感测功能。 ADXL312 活动和非活动检测功能检测有无运动发生。 活动和非活动感测还检测任意轴上的加速度是否超过用户设置的限值。 低功耗模式允许进行基于运动的智能电源管理，从而以极低的功耗进行阈值感测和运动加速度测量。 ADXL312 3 轴加速计符合汽车应用标准，工作温度范围为 -40°C 至 +105°C，非常适合汽车报警和黑匣子应用。
The device measures the static acceleration of gravity in tilt-sensing applications. The device also measures dynamic acceleration resulting from motion or shock. ADXL312’s high resolution of 2.9mg/LSB allows resolution of inclination changes of as little as 0.25°.
The ADXL312 accelerometer's embedded FIFO technology facilitates oversampling techniques to improve resolution to as little as 0.05° of inclination.
The ADXL312 accelerometer also offers special sensing functions. ADXL312’s activity and inactivity sensing detect the presence or absence of motion. The activity and inactivity sensing also detect if the acceleration on any axis exceeds a user-set level. Low-power modes allow intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.
Qualified for automotive applications and operating across a −40 to +105°C temperature range, the ADXL312 3-axis accelerometer is well-suited for car alarm and black-box applications.
特性
- Ultra-low power: as low as 57μA in measurement mode and 0.1μA in standby mode at VS = 3.3V (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 ±12g (maintaining 2.9 mg/LSB scale factor in all g ranges)
- Embedded FIFO technology minimizes host processor load
- Built-in motion detection functions for activity/inactivity monitoring
- Supply and I/O voltage range: 2V to 3.6V
- 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 to +105°C)
- Wide temperature range (−40 to +105°C)
- 10,000g shock survival
- Pb free/RoHS compliant
- Small and thin: 5mm × 5mm × 1.45mm LFCSP package
- Qualified for automotive applications
应用
- Car alarm
- Hill-start aid (HSA)
- Electronic parking brake
- Data recorder (black box)
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