Includes temperature and drift over lifetime. Excluding mechanical shocks
The company claims an offset error over life and temperature of ±4mg for x and y axes, and ±6mg for z, for the unit, dubbed SCA3400-D01. (‘g’ in this article is gravity rather than grams).
Offset error over operating temperature is ±2mg for x and y, and ±3mg for z, while initial offset is ±5 for x and y, and ±7.5 for z.
“It exhibits a linearity error figure of 1mg over a 1.2g range and a noise density of 20µg/√Hz,” said Murata. “A feature of the 3-axis accelerometer that should appeal to industrial equipment makers is the user-selectable dynamic range and low-pass filtering, which enables designers to configure the part for the best combination of resolution, linearity and noise.
The choice is ±2.4g with a 80Hz low-pass filter, or ±1.2g with a 10Hz filter.
Communication with the host system is over an SPI serial interface, and self-diagnostics flag situations when the measured signal is not reliable.
Operation is over 3 to 3.6V and -40 to +85°C, and the unit’s 12pad plastic housing measures 8.6 x 7.6 x 3.3mm.
An evaluation board is available, as well as four unit sample bags. Production reels have 100 or 1,000 pieces.
Find the SCA3400-D01 accelerometer on this Murata web page
In February, ST announced a 2.5 x 3mm inertial measurement unit with six accelerometers for sports wearables.
