This document describes the features and characteristics of the MMA6281QT low cost capacitive micromachined accelerometer introduced by Freescale Semiconductor, including signal conditioning, low pass filter, temperature compensation, and g-select.
The MMA6281QT is a 2‑axis low‑g capacitive micromachined accelerometer from Freescale Semiconductor. It offers selectable sensitivities (2.5 g, 3.3 g, 6.7 g, 10 g), ultra‑low current consumption (500 pA typical, 3 pA in Sleep Mode), and integrated signal‑conditioning with a single‑pole low‑pass filter.
The document lists electrical ratings, mechanical dimensions, pin functions, PCB layout recommendations, and typical application examples such as tilt monitoring, pedometer motion sensing, and robotics. Key performance parameters like bandwidth, noise, and response times are provided for designers.
| Supply Voltage | 2.2 V – 3.6 V |
|---|---|
| Typical Supply Current | 500 pA |
| Sleep Mode Current | 3 pA |
| Bandwidth (X‑axis) | 350 Hz |
| Bandwidth (Z‑axis) | 150 Hz |
| Noise RMS (0.1 Hz‑1 kHz) | 3.0 mVrms |
| Power‑up Response Time | 1.0 ms – 2.0 ms |
In sleep mode the accelerometer consumes only about 3 pA of current.
The accelerometer operates from 2.2 V to 3.6 V.
The X‑axis bandwidth is 350 Hz and the Z‑axis bandwidth is 150 Hz.