Overview
The MMA8451QT, produced by NXP USA Inc., is a smart, low-power, three-axis, capacitive, micromachined accelerometer. It features 14 bits of resolution and is designed for a wide range of applications requiring precise motion detection and orientation sensing. The device is known for its low power consumption and embedded functions that allow for flexible user-programmable options, making it suitable for various industrial, consumer, and automotive applications.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 1.95 V to 3.6 V |
| Interface Voltage | 1.6 V to 3.6 V |
| Full Scale Range | ±2 g, ±4 g, ±8 g (dynamically selectable) |
| Output Data Rates (ODR) | 1.56 Hz to 800 Hz |
| Noise | 99 μg/√Hz |
| Digital Output Resolution | 14-bit and 8-bit |
| Digital Interface | I2C |
| Interrupt Pins | Two programmable interrupt pins for seven interrupt sources |
| Package | 16-pin QFN, 3 mm x 3 mm x 1 mm |
| Temperature Range | –40 °C to +85 °C |
Key Features
- Embedded interrupt functions for power savings
- Access to both low-pass filtered and high-pass filtered data
- Three embedded channels of motion detection: freefall, pulse, and jolt detection
- Orientation (portrait/landscape) detection with programmable hysteresis
- Automatic ODR change for auto-wake and return to sleep
- 32-sample FIFO
- Self-test capability
- Low power consumption: 6 μA to 165 μA
Applications
- E-compass applications
- Static orientation detection (portrait/landscape, up/down, left/right, back/front position identification)
- Notebook, e-reader, and laptop tumble and freefall detection
- Real-time orientation detection (virtual reality and gaming 3D user position feedback)
- Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup)
- Motion detection for portable product power saving (auto-sleep and auto-wake for cell phone, PDA, GPS, gaming)
- Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging)
- User interface (menu scrolling by orientation change, tap detection for button replacement)
Q & A
- What is the MMA8451QT? The MMA8451QT is a low-power, three-axis, capacitive, micromachined accelerometer with 14 bits of resolution.
- What are the supply voltage and interface voltage ranges for the MMA8451QT? The supply voltage range is 1.95 V to 3.6 V, and the interface voltage range is 1.6 V to 3.6 V.
- What are the full scale ranges available for the MMA8451QT? The full scale ranges are ±2 g, ±4 g, and ±8 g, which are dynamically selectable.
- What is the output data rate (ODR) range of the MMA8451QT? The ODR range is from 1.56 Hz to 800 Hz.
- How many interrupt pins does the MMA8451QT have? The MMA8451QT has two programmable interrupt pins for seven interrupt sources.
- What are some of the embedded motion detection features of the MMA8451QT? The device includes freefall, pulse, and jolt detection, as well as orientation detection with programmable hysteresis.
- What is the package type and dimensions of the MMA8451QT? The MMA8451QT is available in a 16-pin QFN package with dimensions of 3 mm x 3 mm x 1 mm.
- What is the temperature range for the MMA8451QT? The temperature range is –40 °C to +85 °C.
- What are some typical applications of the MMA8451QT? Typical applications include e-compass, static orientation detection, real-time orientation detection, motion detection for power saving, and shock and vibration monitoring.
- Does the MMA8451QT have a self-test capability? Yes, the MMA8451QT includes a self-test capability.
