3-Axis Digital Accelerometer


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The RT3020 is a low power three-axis motion acceleration sensor with digital output. This device has user selectable full scale ranges of ±2g, ±4g, ±8g, ±16g, and ±32g, and it is capable of measuring acceleration with output data rates (ODR) from 6.25Hz to 400Hz.

The RT3020′s low power design yields a nominal operating current rating of less than 5.8μA at 25Hz ODR and the device can automatically switch to an even lower power in Wakeup Mode with 1.4μA current at 6.25Hz ODR when no motion is detected for a given period of time. Once in this low power mode, it can be triggered by a motion to return to the normal operation mode of higher ODR automatically. In Normal Mode, the low pass filter can be enabled to limit the bandwidth according to the ODR setting. High resolution measurement data therefore can be obtained due to lower noise power bandwidth.

In order to further reduce the system power, a deep FIFO is provided to store data locally, therefore allows host processor stay in low power sleep mode longer. Upon the FIFO buffer full, an interrupt is issued to inform the host processor to fetch the entire block of data.

On-chip hardware is employed to detect most frequently used motion events and issues interrupts to the host processor, such as tapping, free fall, etc. As a result, it enables the system to respond to critical events with minimum delay time.

The RT3020 can operate over a wide 1.8V to 3.3V supply range and the operating temperature range covers from -40 to +85 degree centigrade. The RT3020 is available in LGA-12L 2x2mm package, ideal for health band, smart watch and other battery powered products.


  • IoT Devices
  • Mobile Phones
  • Tablets
  • Wearables
Key Spec.
Status Active
Range (g) 16;2;32;4;8
Supply Voltage VDD (min) (V) 1.8
Supply Voltage VDD (max) (V) 3.3
Interface I2C;SPI
Features Ultra Low Power
Package Type LGA2x2-12
  • Low Power Consumption
    ► 9.1μA @ 50Hz ODR Normal Mode
    ► 5.8μA @ 25Hz ODR Normal Mode
    ► 1.4μA @ 6.25Hz ODR Wakeup Mode
    ► 0.11μA @ Power Down Mode
  • System Level Power Saving Features
    ► Automatic Wakeup to Normal Mode Switching
    ► Deep FIFO :
        ♦ 120 frames for 8-bit Data 
        ♦ 80 frames for 12-bit Data
  • Embedded Motion Detection Features
    ► Single / Double Tap Sensing
    ► Flat Detection
    ► Orientation Recognition
    ► Shock and Free-Fall Detection
    ► Static Gesture Recognition
  • Programmable Full Scale Range: ±2g/±4g/±8g/ ±16g/±32g
  • Inputs for External Clocking and Synchronized Sampling
  • Wide Supply and I/O Voltage Range: 1.8V to 3.3V
  • Operation Temperature: -40°C to 85°C
  • Digital I/O Interface
    ► I2C Interface Supporting Standard Mode, Fast Mode and Fast Mode Plus
    ► SPI Interface Supporting 3-Wire and 4-Wire Mode
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3-Axis Digital Accelerometer2018/12/18